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Galstian, Anahit. "Lp - Lq decay estimates for the equation with exponentially growing coefficient." Universität Potsdam, 2001. http://opus.kobv.de/ubp/volltexte/2008/2607/.
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Wilson, Celia M. "Attenuation of the Squared Canonical Correlation Coefficient Under Varying Estimates of Score Reliability." Thesis, University of North Texas, 2010. https://digital.library.unt.edu/ark:/67531/metadc30528/.
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Research pertaining to the distortion of the squared canonical correlation coefficient has traditionally been limited to the effects of sampling error and associated correction formulas. The purpose of this study was to compare the degree of attenuation of the squared canonical correlation coefficient under varying conditions of score reliability. Monte Carlo simulation methodology was used to fulfill the purpose of this study. Initially, data populations with various manipulated conditions were generated (N = 100,000). Subsequently, 500 random samples were drawn with replacement from each population, and data was subjected to canonical correlation analyses. The canonical correlation results were then analyzed using descriptive statistics and an ANOVA design to determine under which condition(s) the squared canonical correlation coefficient was most attenuated when compared to population Rc2 values. This information was analyzed and used to determine what effect, if any, the different conditions considered in this study had on Rc2. The results from this Monte Carlo investigation clearly illustrated the importance of score reliability when interpreting study results. As evidenced by the outcomes presented, the more measurement error (lower reliability) present in the variables included in an analysis, the more attenuation experienced by the effect size(s) produced in the analysis, in this case Rc2. These results also demonstrated the role between and within set correlation, variable set size, and sample size played in the attenuation levels of the squared canonical correlation coefficient.
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Patterson, Mason Foushee. "Standardization of Street Sampling Units to Improve Street Tree Population Estimates Derived by I-Tree Streets Inventory Software." Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/42687.
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Street trees are a subpopulation of the urban forest resource and exist in the rights-of-way adjacent to public roads in a municipality. Benefit-cost analyses have shown that the annual benefits provided by the average street tree far outweigh the costs of planting and maintenance. City and municipal foresters spend a majority of their time and resources managing street tree populations. Sample street tree inventories are a common method of estimating municipal street tree populations for the purposes of making urban forest policy, planning, and management decisions.
i-Tree Streets is a suite of software tools capable of producing estimates of street tree abundance and value from a sample of street trees taken along randomly selected sections (segments) of public streets. During sample street tree inventories conducted by Virginia Tech Urban Forestry, it was observed that the lengths of the sample streets recommended by i-Tree varied greatly within most municipalities leading to concern about the impact of street length variation on sampling precision.
This project was conducted to improve i-Tree Streets by changing the recommended sampling protocol without altering the software. Complete street tree censuses were obtained from 7 localities and standardized using GIS. The effects of standardizing street
segments to 3 different lengths prior to sampling on the accuracy and precision of i-Tree Streets estimates were investigated though computer simulations and analysis of changes in variation in number of trees per street segment as a basis for recommending procedural changes.
It was found that standardizing street segments significantly improved the precision of i-Tree Streets estimates. Based on the results of this investigation, it is generally recommended that street segments be standardized to 91m (300 ft) prior to conducting a sample inventory. Standardizing to 91m will significantly reduce the number of trees, the number of street segments, and the percentage of total street segments that must be sampled to achieve an estimate with a 10% relative standard error.
The effectiveness of standardization and the associated processing time can be computed from municipal attributes before standardization so practitioners can gauge the marginal gains in field time versus costs in processing time. Automating standardization procedures or conducting an optimization study of segment length would continue to increase the efficiency and marginal gains associated with street segment standardization.Master of Science
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Semaško, Ala. "Baigtinės populiacijos koreliacijos koeficiento vertinimas, naudojant papildomus kintamuosius." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2011. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20110711_110917-80836.
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Šiame magistro darbe nagrinėjamos papildomos informacijos panaudojimo galimybės konstruojant baigtinės populiacijos koreliacijos koeficiento įvertinius. Taikant imties plano svorių kalibravimo metodus sukonstruojami aštuoni nauji koreliacijos koeficiento įvertiniai. Įvertiniams konstruoti panaudotos kelios kalibravimo lygčių ir atstumo funkcijų kombinacijos. Kalibruotieji svoriai išvesti pasitelkiant Lagranžo neapibrėžtųjų daugiklių metodą. Naudojant Teiloro ištiesinimo ir visrakčio metodus sukonstruojami koreliacijos koeficiento įvertinių dispersijos įvertiniai. Darbe taip pat atliekamas matematinis modeliavimas, kuriuo siekiama palyginti naujai sukonstruotus įvertinius tarpusavyje ir su standartiniu įvertiniu. Įvertinių tikslumą lemia pakankamai didelė koreliacija tarp tyrimo kintamųjų ir jų papildomų kintamųjų, o du įvertiniai yra tikslūs ir esant mažai koreliacijai. Tiriama, kaip įvertinių tikslumą įtakoja imties dydis bei koreliacija tarp tyrimo ir papildomų kintamųjų. Matematinio modeliavimo eksperimentai atlikti, naudojant darbo autorės sukurtas MATLAB programas.This master’s thesis analyzes the opportunities of auxiliary information usage while constructing the correlation coefficient estimators of the finite population. By applying the methods of weight calibration of sample design the new eight correlation coefficient estimators are derived. Several combinations of calibration equations and distance measures are used to construct estimators. Calibration weights were derived through Lagrange multiplier method. Using Taylor linearization and jackknife methods variance estimators of the correlation coefficient estimators were constructed. The paper also contains a mathematical simulation aimed at comparing the new derived estimators in between and with a standard estimator. The accuracy of estimators is determined by rather substantial correlation between study and auxiliary variables, whereas two of the estimators are accurate even in the presence of bad correlation. It is tested how sample size and correlation between study and auxiliary variables influences the accuracy of estimators. All the mathemathical simulation tests were performed employing MATLAB programs that have been created by the author of this work.
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Blair, Matthew D. "Strichartz estimates for wave equations with coefficients of Sobolev regularity /." Thesis, Connect to this title online; UW restricted, 2005. http://hdl.handle.net/1773/5745.
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CAFFERATA, Mattia. "Estimates for a family of exponential sums with modular coefficients." Doctoral thesis, Università degli studi di Ferrara, 2019. http://hdl.handle.net/11392/2488054.
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In this work we establish non-trivial estimates for a family of exponential sums weighted with modular coefficients. Two sequences of weights are considered: the sequence {a_f(n)} of the normalized Fourier coefficients of a cuspidal eigenform f and the sequence {\mu_f(n)} obtained as the inverse of {a_f(n)} with respect to the Dirichlet convolution.
The main tool developed for our proof is a generalisation of a result due to Bourgain, Sarnak and Ziegler which is widely used to study the orthogonality properties of the Moebius function \mu(n).
We remark that the function \mu_f(n) is strictly related to \mu(n); we can summarise saying that \mu_f(n) plays for the L-function associated to f the same role that \mu(n) plays for the Riemann zeta-function.
In the first chapter we recall some basic properties of the Moebius function focusing on some aspects related to the Moebius Randomness Law and to the Sarnak conjecture.
In the second chapter we recall some interesting properties about modular forms, we prove the generalisation of the result of Burgain, Sarnak and Ziegler and that it can be applied while working with the sequences {a_f(n)} and {\mu_f(n)}.
In the third chapter we prove the estimates for the exponential sums.In questo lavoro otteniamo stime non banali per una famiglia di somme esponenziali pesate con coefficienti di natura modulare. Due successioni di pesi sono considerate: la successione {a_f(n)} dei coefficienti di Fourier normalizzati di un’autofunzione cuspidale f del gruppo modulare e {\mu_f(n)} la successione inversa di {a_f(n)} rispetto alla convoluzione di Dirichlet. Lo strumento principale sviluppato per la nostra dimostrazione è una generalizzazione di un risultato di Bourgain, Sarnak e Ziegler; nella versione originale, il risultato ha numerose applicazioni nello studio delle proprietà di cancellazione legate alla funzione di Moebius \mu(n), a cui solitamente ci si riferisce con Moebius Randomness Law. Osserviamo che la funzione \mu_f(n) è strettamente legata a \mu(n); possiamo sintetizzare dicendo che \mu_f(n) gioca per la L-funzione associata ad f il ruolo che \mu(n) gioca per la funzione zeta di Riemann. Nel primo capitolo si richiamano alcune proprietà generali della funzione di Moebius con particolare enfasi su questioni inerenti alla Moebius Randomness Law e alla congettura di Sarnak. Nel secondo capitolo si richiamano alcuni aspetti interessanti delle forme modulari, si dimostra la generalizzazione del risultato di Bourgain, Sarnak e Ziegler e la sua applicabilità alle due successioni {a_f(n)} and {\mu_f(n)}. Nel terzo capitolo si dimostrano le stime per le somme esponenziali.
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SHANG, FENG. "PATH-DEPENDENT APPROACH TO ESTIMATE CHLORINE WALL DEMAND COEFFICIENT IN WATER DISTRIBUTION SYSTEM." University of Cincinnati / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1109274766.
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Petzoldt, Martin. "Regularity and error estimators for elliptic problems with discontinuous coefficients." [S.l.] : [s.n.], 2001. http://www.diss.fu-berlin.de/2001/111/index.html.
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Glenn, L. Lee, and Jeff R. Knisley. "Use of Eigenslope to Estimate Fourier Coefficients for Passive Cable Models of the Neuron." Digital Commons @ East Tennessee State University, 1997. https://dc.etsu.edu/etsu-works/7540.
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Boundary conditions for the cable equation - such as voltage-clamped or sealed cable ends, branchpoints, somatic shunts, and current clamps - result in multi-exponential series representations of the voltage or current. Each term in the series expansion is characterized by a decay rate (eigenvalue) and an initial amplitude (Fourier coefficient). The eigenvalues are determined numerically and the Fourier coefficients are subsequently given by the residues at the eigenvalues of the Laplace transform of the solution. In this paper, we introduce an alternative method for estimating the Fourier coefficients which works for all types of boundary conditions and is practical even when analytic expressions for the Fourier coefficients become intractable. It is shown that terms in the analytic expressions for the Fourier coefficients result from derivatives of the equation for the eigenvalues, and that simple numerical estimates for the amplitude coefficients are easily derived by replacing analytical derivatives by numerical eigenslope. The physical quantity represented by the slope is identified as effective neuron capacitance.
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Benhmida, Saïd. "Robustesse et comportement asymptotique d'un TRA-estimateur des coefficients d'un processus ARMA (p,q)." Nancy 1, 1995. http://www.theses.fr/1995NAN10035.
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Le but essentiel de ce travail est de définir et étudier un estimateur robuste des coefficients d'un modèle moyenne mobile, d'ordre q entier supérieur ou égal a un. Nous commençons par établir la définition d'un estimateur (basé sur les autocovariances des résidus tronqué) pour les coefficients d'un modèle moyenne mobile d'ordre q et ses liens avec d'autres estimateurs. Après avoir introduit la notion de robustesse dans le cadre des séries chronologiques, nous étudions la robustesse de cet estimateur, ou nous montrons que sa fonction d'influence est bornée. Nous nous intéressons aussi au comportement asymptotique de cet estimateur, ou nous montrons sa convergence presque sure et sa normalité asymptotique. Puis nous montrons que les résultats obtenus pour un modèle moyenne mobile se généralisent à un modèle autorégressif moyenne mobile d'ordre p et q. à la fin nous nous donnons une application numérique, qui a pour but d'illustrer les résultats théoriques obtenus pour un modèle moyenne mobile d'ordre deux et de généraliser les algorithmes d'estimation à des modèles moyenne mobile d'ordre q supérieur ou égal à deux
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Zhivkoplias, Erik. "Comparing the performance of different methods to estimate selection coefficient across parameter space using time-series genomic data." Thesis, Uppsala universitet, Institutionen för biologisk grundutbildning, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-420278.
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Estimating selection is of key importance in evolutionary biology research. The recent price drop in sequencing and advances in NGS data analysis have opened up new avenues for novel methods that estimate selection quantitatively from time-series allele frequency data. However, it is not yet well understood which method performs best given specific model systems and experimental designs. Here, using popular quantitative metrics, we compared the performance of four prominent methods on a series of simulated data sets and on data from real biological experiments. We identified in three out of four methods the experi- mental conditions best suited for estimating selection. We also explored the limitations of these methods when estimating selection from complex patterns of allele frequency change in some relevant evolutionary scenarios. Our findings highlight the need for modification of population genomics models that are still used in inference of model parameters with the goal to develop new, more accurate methods for the quantitative estimation of selection in time-series genomic data.
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Sande, Olow. "Boundary Estimates for Solutions to Parabolic Equations." Doctoral thesis, Uppsala universitet, Matematiska institutionen, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-281451.
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This thesis concerns the boundary behavior of solutions to parabolic equations. It consists of a comprehensive summary and four scientific papers. The equations concerned are different generalizations of the heat equation. Paper I concerns the solutions to non-linear parabolic equations with linear growth. For non-negative solutions that vanish continuously on the lateral boundary of an NTA cylinder the following main results are established: a backward Harnack inequality, the doubling property for the Riesz measure associated with such solutions, and the Hölder continuityof the quotient of two such solutions up to the boundary. Paper 2 concerns the solutions to linear degenerate parabolic equations, where the degeneracy is controlled by a Muckenhoupt weight of class 1+2/n. For non-negative solutions that vanish continuously on the lateral boundary of an NTA cylinder the following main results are established: a backward Harnack inequality, the doubling property for the parabolic measure, and the Hölder continuity of the quotient of two such solutions up to the boundary. Paper 3 concerns a fractional heat equation. The first main result is that a solution to the fractional heat equation in Euclidean space of dimension n can be extended as a solution to a certain linear degenerate parabolic equation in the upper half space of dimension n+1. The second main result is the Hölder continuity of quotients of two non-negative solutions that vanish continuously on the latteral boundary of a Lipschitz domain. Paper 4 concerns the solutions to uniformly parabolic linear equations with complex coefficients. The first main result is that under certain assumptions on the opperator the bounds for the single layer potentials associated to the opperator are bounded. The second main result is that these bounds always hold if the opperator is realvalued and symmetric.
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Rodrigue, Natalie. "A comparison of the performance of Generalized Procrustes analysis and the intraclass coefficient of correlation to estimate interrater reliability." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0022/MQ50868.pdf.
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Williams, Scott Lawrence. "Separation of mixed radiometric land cover temperatures in time-delayed bi-angular views using estimated fractional differential coefficients." Thesis, New Mexico State University, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3582404.
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A dissertation is presented concerning the separation of radiometric temperatures of sparse land covers from two views of mixed thermal and NDVI samples with a time delay between the views. The research scope is limited to a simple binary land cover of vegetation canopy and bare soil. Previous methods have been developed using simultaneous views but little work has been done on time-delayed sampling, which is the focus of this study.
The dissertation hypothesis is based on the observation that the rate of change of a mixed radiometric temperature with respect to actual fractional vegetation cover, dTm/dfa originally constructed using spatially varying vegetation covers, can also be constructed using bi-angular views of the same land parcel but with a different interpretation; that bi-angular samples provide a perceived fractional cover differential, dTm/df0 . The hypothesis is that dTm/df0 can be used for sub-pixel temperature discrimination of binary land covers and, moreover, that the separate soil and vegetation total differential coefficients dTm/df0 and dTv/df0, required in the algebraic system, can be characterized to sufficiently capture environmental influences between samples in time. To test the hypothesis, this study heuristically derives a first-order estimation of the differential coefficients, required to decompose land cover temperatures from mixed data points, for any time-delayed sampling spanning the day. Applying the estimated values on similar target days gives a high success rate for a local time span of at least a week.
This approach, once scaled up, could be used by platforms with inherent time delays, such as tandem weather satellites, to provide separate land cover temperature estimates from low-resolution sensors.
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Tang, Lin. "Efficient Inference for Periodic Autoregressive Coefficients with Polynomial Spline Smoothing Approach." University of Toledo / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1449770216.
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weathers, jeffrey wayne. "COMBINING THE MATRIX TRANSFORM METHOD WITH THREE-DIMENSIONAL FINITE ELEMENT MODELING TO ESTIMATE THE INTERFACIAL HEAT TRANSFER COEFFICIENT CORRESPONDING TO VARIOUS MOLD COATINGS." MSSTATE, 2005. http://sun.library.msstate.edu/ETD-db/theses/available/etd-04072005-143359/.
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The interfacial heat transfer coefficient is an important variable regarding the subject of metal castings. The error associated with the experimental temperature data must be dealt with appropriately so that they do not significantly affect the resulting interfacial heat transfer coefficient. The systematic and random errors are addressed using a combination of three-dimensional finite element modeling and the matrix transform method, respectively. Experimentally obtained A356 permanent mold casting data was used to estimate the interfacial heat transfer coefficient corresponding to common industrial mold coatings.
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ILLIG, Aude. "Etude asymptotique de certains estimateurs dans des modèles ARMA spatiaux." Phd thesis, INSA de Toulouse, 2004. http://tel.archives-ouvertes.fr/tel-00007866.
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Nous nous intéressons à l'étude asymptotique de certaines statistiques dans des modèles ARMA spatiaux quadrantauxdont les innovations sont supposées être indépendantes et identiquement distribuées ou plus généralement vérifier une propriété de martingales fortes. Après une revue des théorèmes limites pour des martingales spatiales sur un réseau, nous démontrons d'abord un théorème de la limite centrale et un principe d'invariance sous la condition de Lindeberg conditionnelle pour des tableaux de martingales fortes. Afin de mieux situer notre étude des champs ARMA quadrantaux, nous rappelons divers résultats conçernant l'estimation et l'identification dans d'autres modèles ARMA spatiaux. Puis, dans le but de sélectionner les ordres et d'estimer les paramètres autorégressifs de modèles ARMA spatiaux quadrantaux, nous introduisons un nouvel estimateur obtenu à partir des équations de Yule-Walker généralisées. Nous démontrons sa consistance et sa normalité asymptotique. Enfin, pour un certain nombre de modèles ARMA spatiaux, nous illustrons leurs comportements par des représentations graphiques et nous
présentons une étude de procédures pour les identifier à partir de nombreuses simulations.
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Illig, Aude. "Etude asymptotique de certains estimateurs pour des modèles ARMA spatiaux." Toulouse, INSA, 2004. http://www.theses.fr/2004ISAT0027.
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Nous nous intéressons à l'étude asymptotique de certaines statistiques dans des modèles ARMA spatiaux quadrantaux dont les innovations sont supposées être indépendantes et identiquement distribuées ou plus généralement vérifier une propriété de martingales fortes. Après une revue des théorèmes limites pour des martingales spatiales sur un réseau, nous démontrons d'abord un théorème de la limite centrale et un principe d'invariance sous la condition de Lindeberg conditionnelle pour des tableaux de martingales fortes. Afin de mieux situer notre étude des champs ARMA quadrantaux, nous rappelons divers résultats conçernant l'estimation et l'identification dans d'autres modèles ARMA spatiaux. Puis, dans le but de sélectionner les ordres et d'estimer les paramètresautorégressifs de modèles ARMA spatiaux quadrantaux, nous introduisons un nouvel estimateur obtenu à partir des équations de Yule-Walker généralisées. Nous démontrons sa consistance et sa normalité asymptotique. Enfin, pour un certain nombre de modèles ARMA spatiaux, nous illustrons leurs comportements par des représentations graphiques et nous présentons une étude de procédures pour les identifier à partir de nombreuses simulationsWe study the asymptotic behaviour of some statistics for spatial quadrantal ARMA models with independent and identically distributed innovations or more generally strong martingales innovations. After giving a review of limit theorems for lattice martingales, we establish a central limit theorem and an invariance principle under the conditional Lindeberg condition for strong latticemartingales. For a better understanding of our study on quadrantal ARMA random fields, we recall various results on estimation and identification for others spatial ARMA models. Then, in order to select orders and estimate autoregressive coefficients in spatial quadrantal ARMA models, we introduce a new estimator based on a derivation of extended Yule-Walker equations and prove that it is consistent and asymptotically normal. Finally, we illustrate with graphic representations the behaviour of several spatial ARMA models and present a study of procedures for their identification
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De, Marco Stefano. "On Probability Distributions of Diffusions and Financial Models with non-globally smooth coefficients." Doctoral thesis, Scuola Normale Superiore, 2011. http://hdl.handle.net/11384/85676.
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In this Ph.D. dissertation we deal with the issue of the regularity and the estimation of
probability laws for diffusions with non-globally smooth coefficients, with particular focus on
financial models.
The analysis of probability laws for the solutions of Stochastic Differential Equations (SDEs)
driven by the Brownian motion is among the main applications of the Malliavin calculus on
the Wiener space: typical issues involve the existence and smoothness of a density, and the
study of the asymptotic behaviour of the distribution’s tails. The classical results in this area
are stated assuming global regularity conditions on the coefficients of the SDE: an assumption
which fails to be fulfilled by several financial models, whose coefficients involve square-root
or other non-Lipschitz continuous functions. Then, in the first part of this thesis (chapters
2, 3 and 4) we study the existence, smoothness and space asymptotics of densities when
only local conditions on the coefficients of the SDE are considered. Our analysis is based
on Malliavin calculus tools and on tube estimates for Itô processes, namely estimates on the
probability that an Itô process remains around a deterministic curve up to a given time.
We give applications of our results to general classes of option pricing models, including
generalisations of CIR and CEV processes and Local Stochastic Volatility models. In the
latter case, the estimates we derive on the law of the underlying price have an impact on
moment explosion and, consequently, on the large-strike asymptotic behaviour of the implied
volatility.
Implied volatility modeling, in its turn, makes the object of the second part of this thesis
(chapters 5 and 6). We deal with some questions related to the issue of an efficient and
economical parametric modelisation of the volatility surface. We focus on J. Gatheral’s SVI
model, first tackling the problem of its calibration to the market smile. We propose an
effective quasi-explicit calibration procedure and display its performances on financial data.
Then, we analyse the capability of SVI to generate efficient time-dependent approximations
of symmetric smiles, providing the corresponding numerical applications in the framework of
the Heston stochastic volatility model.
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Guimarães, Paulo Henrique Ramos. "Parâmetros genéticos e fenotípicos em arroz irrigado estimados por método de análise espacial." Universidade Federal de Goiás, 2014. http://repositorio.bc.ufg.br/tede/handle/tede/3956.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES
Some spatial analysis methods have been applied in order to mitigate environmental variation. The objective of this study was to evaluate the efficiency of spatial statistical, through the method of Papadakis, relative to the analysis to augmented blocks Federer in the correction of environmental variation. Were evaluated 198 progenies S0:2 of rice and four witnesses for augmented blocks of Federer. Data set were taken in the grain yield (GY, kg ha- 1) and plant height (PH, cm). The data set were subjected to variance analyses and were estimated the genetic and phenotypic parameters. The different approaches (BAF and Papadakis) were compared as to their estimates of genetic and phenotypic parameters. The ranking of adjusted means in the two models analyzed was performed, and calculated the Spearman correlation. There have been improvements in the statistics that depict the experimental accuracy when the spatial analysis was, that affect the estimates of genetic and phenotypic parameters. The use of the Papadakis method yielded fewer iterations compared to BAF for the same value of . Was able to gain direct selection for the AP and PG characters when the Papadakis method was used. With the use of spatial analysis selection was less influenced by the effect of environmental variation. Finally it was found that the spatial analysis methods were effective in the removal of environmental effects highlighting the Papadakis method, indicating that it can provide improvement
Alguns métodos de análise espacial têm sido aplicados objetivando reduzir a variação ambiental. O objetivo deste trabalho foi avaliar a eficiência da análise espacial, por meio do método de Papadakis, em relação ao delineamento de blocos aumentados de Federer na correção da variação ambiental. Foram avaliadas 198 progênies S0:2 de arroz irrigado e quatro testemunhas no delineamento de blocos aumentados de Federer. Os caracteres avaliados foram: produção de grãos (PG, kg ha-1) e de altura de plantas (AP, cm). Foi efetuada análise de variância para os caracteres estudados e estimados os componentes de variância e os parâmetros genéticos e fenotípicos. As diferentes abordagens (BAF e Papadakis) foram comparadas quanto às suas estimativas de parâmetros genéticos e fenotípicos e correlação de Spearman. Houve melhorias nas estatísticas que retratam a precisão experimental quando a análise espacial foi utilizada, isto influenciou as estimativas de parâmetros genéticos e fenótipos. O uso do método de Papadakis apresentou a necessidade de uso de menor número de repetições em relação ao BAF para o mesmo valor de . Houve ganho de seleção direto para os caracteres AP e PG quando o método de Papadakis foi utilizado. Com o uso da análise espacial a seleção foi menos influenciada pelo efeito da variação ambiental. Por fim verificou-se que o método de Papadakis foi eficiente na remoção dos efeitos ambientais, indicando que o mesmo pode proporcionar melhoria na precisão experimental, o que torna o processo seletivo mais eficiente.
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OULD, KHAL ABDELLAH. "Theoremes fonctionnels d'erdos-renyi relatifs aux processus lineaires ; du type shepp-sur le probleme du geyser stochastique - estimateurs du coefficient d'adjustement - extension du theoreme d'erdos-renyi." Paris 6, 1996. http://www.theses.fr/1996PA066313.
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Nous nous proposons d'etablir des resultats dans la lignee de ceux de deheuvels, p. (1991). Dans ce dernier article, une version fonctionnelle du theoreme d'erdos-renyi (1970) a ete etablie avec des applications. En se mettant dans un cadre plus general que celui de deheuvels (1991) ; a savoir celui des processus lineaires, pour lesquels nous etablissons une version fonctionnelle d'erdos-renyi. Nous etablissons egalement une version fonctionnelle du theoreme d'erdos-renyi du type shepp, en donnant des applications a chaque sous-chapitre. Dans le chapitre 3, nous exposons une generalisation du probleme du geyser stochastique de bartfai (1966), dont nous presentons la solution dans l'esprit des travaux d'erdo-renyi sur les accroissements des sommes partielles. Enfin, nous etablissons quelques resultats sur la convergence presque sur, la consistence et la vitesse de convergence de certains estimateurs du coefficient d'adjustement dans la theorie du risque et une extension du theoreme d'erdos-renyi (1970)
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Echiejile, Faith. "Analysis of Monthly Suspended Sediment Load in Rivers and Streams Using Linear Regression and Similar Precipitation Data." Youngstown State University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1629203139818238.
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Rüscher, Claus H., Tapas Debnath, Peter Fielitz, Sven Ohmann, and Günter Borchardt. "18 O/16 O Exchange studies in Bi 2 (Ga x Al 1−x) 4 O 9: oxygen diffusion coefficients estimated from infrared absorption and XRD powder data." Diffusion fundamentals 12 (2010) 50, 2010. https://ul.qucosa.de/id/qucosa%3A13888.
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Ibrahim, Amin Abdurahman. "Detecting and preventing the electronic transmission of illicit images." Thesis, UOIT, 2009. http://hdl.handle.net/10155/23.
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The sexual exploitation of children remains a very serious problem and is rapidly increasing globally through the use of the Internet. This work focuses on the current methods employed by criminals to generate and distribute child pornography, the methods used by law enforcement agencies to deter them, and the drawbacks of currently used methods, as well as the surrounding legal and privacy issues. A proven method to detect the transmission of illicit images at the network layer is presented within this paper. With this research, it is now possible to actively filter illicit pornographic images as they are transmitted over the network layer in real-time. It is shown that a Stochastic Learning Weak Estimator learning algorithm and a Maximum Likelihood Estimator learning algorithm can be applied against Linear Classifiers to identify and filter illicit pornographic images. In this thesis, these two learning algorithms were combined with algorithms such as the Non-negative Vector Similarity Coefficient-based Distance algorithm, Euclidian Distance, and Weighted Euclidian Distance. Based upon this research, a prototype was developed using the abovementioned system, capable of performing classification on both compressed and uncompressed images. Experimental results showed that classification accuracies and the overhead of network-based approaches did have a significant effect on routing devices. All images used in our experiments were legal. No actual child pornography images were ever collected, seen, sought, or used.
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Hammami, Imen. "Statistical properties of parasite density estimators in malaria and field applications." Phd thesis, Université René Descartes - Paris V, 2013. http://tel.archives-ouvertes.fr/tel-01064071.
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Malaria is a devastating global health problem that affected 219 million people and caused 660,000 deaths in 2010. Inaccurate estimation of the level of infection may have adverse clinical and therapeutic implications for patients, and for epidemiological endpoint measurements. The level of infection, expressed as the parasite density (PD), is classically defined as the number of asexual parasites relative to a microliter of blood. Microscopy of Giemsa-stained thick blood smears (TBSs) is the gold standard for parasite enumeration. Parasites are counted in a predetermined number of high-power fields (HPFs) or against a fixed number of leukocytes. PD estimation methods usually involve threshold values; either the number of leukocytes counted or the number of HPFs read. Most of these methods assume that (1) the distribution of the thickness of the TBS, and hence the distribution of parasites and leukocytes within the TBS, is homogeneous; and that (2) parasites and leukocytes are evenly distributed in TBSs, and thus can be modeled through a Poisson-distribution. The violation of these assumptions commonly results in overdispersion. Firstly, we studied the statistical properties (mean error, coefficient of variation, false negative rates) of PD estimators of commonly used threshold-based counting techniques and assessed the influence of the thresholds on the cost-effectiveness of these methods. Secondly, we constituted and published the first dataset on parasite and leukocyte counts per HPF. Two sources of overdispersion in data were investigated: latent heterogeneity and spatial dependence. We accounted for unobserved heterogeneity in data by considering more flexible models that allow for overdispersion. Of particular interest were the negative binomial model (NB) and mixture models. The dependent structure in data was modeled with hidden Markov models (HMMs). We found evidence that assumptions (1) and (2) are inconsistent with parasite and leukocyte distributions. The NB-HMM is the closest model to the unknown distribution that generates the data. Finally, we devised a reduced reading procedure of the PD that aims to a better operational optimization and a practical assessing of the heterogeneity in the distribution of parasites and leukocytes in TBSs. A patent application process has been launched and a prototype development of the counter is in process.
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Kawagoe, Daisuke. "Regularity of solutions to the stationary transport equation with the incoming boundary data." Kyoto University, 2018. http://hdl.handle.net/2433/232413.
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Som, Agniva. "Paradoxes and Priors in Bayesian Regression." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1406197897.
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Alves, Paulo Roberto Vieira. "Análise de um coeficiente geométrico para estimativa de perdas de carga em linhas laterais de irrigação por gotejamento." Universidade de São Paulo, 2000. http://www.teses.usp.br/teses/disponiveis/18/18138/tde-17072018-090808/.
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Os projetos hidráulicos para sistemas de irrigação por gotejamento, geralmente, desprezam as perdas de carga localizadas devido ao ressalto resultante da conexão dos gotejadores nas linhas laterais, ou então, estabelecem coeficientes médios ou taxas percentuais para o cálculo destas perdas. No entanto, essas perdas localizadas podem ser bastante significativas, variando com a vazão e a relação modelo do gotejador com diâmetro da tubulação instalada. Esta dissertação apresenta os resultados de uma pesquisa experimental para determinar uma relação matemática que permita estimar as perdas de carga localizadas para cada conjunto gotejador - tubo. Esta relação matemática associa os coeficientes de resistência de carga cinética, em diferentes vazões, com índices geométricos de obstrução para quatro seções, circulares e levemente ovais, de diferentes tubos de polietileno e, quatro modelos de gotejadores, todos comercializados na região de Ribeirão Preto. Abordaram-se ainda aspectos do uso da equação de Blasius para cálculo das perdas de carga distribuída e a influência da variação da viscosidade no escoamento.The hydraulic projects to drip irrigation systems, usually disregard the localized head losses because of the destach of the drip\'s connection in the lateral lines, or establish average coefficients or percentual rates to calculate these losses. However, these localized losses can be rather significant, varying according to the flow and the drip\'s model connection with the diameter of the installed tubing. This dissertation presents the results of an experimental research to determine a mathematical relation that allows us to estirnate the localized head losses to each drip group - tube. This mathematical relation associates the resistance of kinetic head, in different flows, with geometrical contents of obstruction to four sections, circular and slightly oval, from different polietilene tubes, and four models of drips, commercialized in Ribeirão Preto\'s region. It\'s also discussed the aspects of the usage of Blasius equation to calculate the losses of distributed head and the influence of viscosity variation during the drain.
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Bergamaschi, Denise Pimentel. "Correlação intraclasse de Pearson para pares repetidos: comparação entre dois estimadores." Universidade de São Paulo, 1999. http://www.teses.usp.br/teses/disponiveis/6/6132/tde-01102014-105050/.
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Objetivo. Comparar, teórica e empiricamente, dois estimadores do coeficiente de correlação intraclasse momento-produto de Pearson para pares repetidos Pi. O primeiro é o estimador \"natural\", obtido mediante a correlação momento-produto de Pearson para membros de uma mesma classe (rI) e o segundo, obtido como função de componentes de variância (icc). Métodos. Comparação teórica e empírica dos parâmetros e estimadores. A comparação teórica envolve duas definições do coeficiente de correlação intraclasse PI como medida de confiabilidade (*), para o caso de duas réplicas, assim como uma apresentação da técnica de análise de variância e a definição e interpretação dos estimadores ri e icc. A comparação empírica é realizada mediante um estudo de simulação Monte Carlo com a geração de pares de valores correlacionados segundo o coeficiente de correlação intraclasse, momento-produto de Pearson para pares repetidos. Os pares de valores são distribuídos segundo uma distribuição Normal bivariada, com valores do tamanho da amostra e da correlação intraclasse previamente fixados em: n= 15, 30 e 45 e pI = {O; 0,15; 0,30; 0,45; 0,60; 0,75; 0,9}. Resultados. Comparando-se o vício e o erro quadrático médio dos estimadores, bem como as amplitudes dos intervalos de confiança, tem-se como resultado que o vício de icc foi sempre menor que o vício de rI, mesmo ocorrendo com o erro quadrático médio. Conclusões. O icc é um estimador melhor, principalmente para n pequeno (por exemplo 15). Para valores maiores de n (30 ou mais), os estimadores produzem resultados iguais até a segunda casa decimal.Objective. This thesis presents and compares, theoretically and empirically, two estimators of the intraclass correlation coefficient pI, defined as Pearson\'s pairwise intraclass correlation coefficient. The first is the \"natural\" estimator, obtained by Pearson\'s moment-product correlation for members of one class (rI) while the second was obtained as a function of components of variance (icc). Methods. Theoretical and empirical comparison of the parameters and estimators are performed. The theoretical comparison involves two definitions of the intrac1ass correlation coefficient pI as a measure of reliability (*) for two repeated measurements in the same class and the presentation of the technique of analysis of variance, as well as for the definition and interpretation of the estimators ri and icc. The empirical comparison was carried out by means of a Monte Carlo simulation study of pairs of correlated values according Pearson\'s pairwise correlation. The pairs of values follow a normal bivariate distribution, with correlation values and sample size previously fixed: n= 15, 30 e 45 and Pl = . Results. Bias and mean square error for the estimators were compared as well as the range of the intervals of confidence. The comparison shows that the bias of icc is always smaller than of rI This also applies to the mean square error. Conclusions. The icc is a better estimator, especially for n less than or equal to 15. For larger samples sízes (n 30 or more), the estimators produce results that are equal to the second decimal place. (*) Fórmula
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Liao, Shaojuan. "Three Essays on Economic Growth and Technology Development: Considering the Spillover Effects." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/37808.
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This dissertation consists of three essays on the empirical analysis of economic growth and technology development. In particular, I
consider spillover effects in different frameworks. The first chapter outlines the three topics involved and briefly discusses the
motivations, methods as well as some conclusions in each of the following chapters.
The second chapter considers the spillovers in economic growth and convergence. Spillovers are prevalent in nowadays' economy. I formally model the spillover effects as the interdependence of total factor productivity (TFP), and develop a model in which spillover effects of R&D through the channel of international trade make the
TFPs correlated among countries. In this sense, I apply the thoughts of international trade to the economic growth framework. Empirically, I develop a three-stage generalized method of moment(GMM) to estimate the dynamic panel spatial error autoregressive model. Simulation results show that my estimator is consistent and efficient. Through counterfactual analysis, I find that there are positive spillovers through both geographic connection and trade connection. Such a positive spillover effect, however, slows down
the convergence speed. Moreover, there were little spillovers in the early 1960s. Spillover effects become stronger overtime.
The third chapter is about the determinants of technology development in China. What makes my paper different from others is that I take a full consideration of the spillover effects: provincial spillovers in Science and Technology (S&T) capital as well as S&T personnel, and international spillovers through trade and FDI. The most interesting point in my paper is that I consider the indirect effects of institutions on technology development. Marketization, measured by the share of state-owned enterprises (SOEs) in the economy, affects the production of technology through different channels at different stages. I use a semiparametric varying-coefficient model to account for the effects. In this paper, I find that provincial spillovers are mainly through the
externalities of S&T capital stock while international spillovers occur through trade. Marketization affects the technology development through S&T capital, S&T capital spillovers and trade. Although a certain share of SOEs is necessary for technology production, the marketization process will promote the development
of technology in China in the long run.
The fourth chapter looks into the provincial technology spillovers from another aspect. Instead of the S&T endowment spillovers from
the nearby provinces, I consider the technology transfer from the frontier province to the targeted province as well as the absorptive
capacity of the targeted province itself. Two forms of technology transfer are analyzed: the technology distance due to the structural
discrepancy in the patent portfolio and the technology gap because of the difference in the patent level. Through the empirical analysis, several factors contributing to patent growth, such as S&T investment, road density, international spillovers from imports and FDI, are identified. Moreover, I find that technology transfer due to the technology distance can stimulate patent growth. However, I fail to find robust evidence of technology transfer due to the
technology gap, which implies that the provincial technology convergence may not exist in China.Ph. D.
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Komosná, Milada. "Porovnání tržních cen nemovitostí s cenami zjištěnými porovnávacím způsobem podle oceňovacích předpisů." Doctoral thesis, Vysoké učení technické v Brně. Ústav soudního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-234304.
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This thesis deals with a comparison of the market prices of Brno family houses. The compared prices are estimated using the comparative way based on the price regulations and using the comparative method. A new coefficient for the comparative method is proposed in the thesis. This coefficient takes into account the influence of the distance of the estimate property from the city centre in the connection with the position. One of the main reasons to introduce this coefficient was to obtain the best result when estimating the price, the result which is the closest to the required market price. The use of the coefficient of the global position may lead to better results of the price estimate, especially in bigger cities where this influence is revealed the most.
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Kouamo, Olaf. "Analyse des séries chronologiques à mémoire longue dans le domaine des ondelettes." Phd thesis, Télécom ParisTech, 2011. http://pastel.archives-ouvertes.fr/pastel-00565656.
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Le thème de nos travaux porte sur la statistique des processus à longue mémoire, pour lesquels nous proposons et validons des outils statistiques issus de l'analyse par ondelettes. Ces dernières années ces méthodes pour estimer le paramètre de mémoire sont devenues très populaires. Cependant, les résultats théoriques validant rigoureusement les estimateurs pour les modèles semi paramétriques classiques à longue mémoire sont récents (cf. les articles de E. Moulines, F. Roueff et M. Taqqu depuis 2007). Les résultats que nous proposons dans cette thèse s'inscrivent directement dans le prolongement de ces travaux. Nous avons proposé une procédure de test pour détecter des ruptures sur la densité spectrale généralisée. Dans le domaine des ondelettes, le test devient un test de ruptures sur la variance des coefficients d'ondelettes. Nous avons ensuite développé un algorithme de calcul rapide de la matrice de covariance des coefficients d'ondelettes. Deux applications de cet algorithme sont proposées , d'une part pour l'estimation de d et d'autre part pour améliorer le test proposé dans le chapitre précédent. Pour finir, nous avons étudié les estimateurs robustes robustes du paramètre de mémoire d dans le domaine des ondelettes. en se basant sur trois estimateurs de la variance des coefficients d'ondelettes à une échelle. La contribution majeure de ce chapitre est le théorème central limite obtenu pour les trois estimateurs de d dans le cadre des processus gaussiens M(d).
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PACE, MARIA LUCIA. "La diseguaglianza di opportunità in Italia." Doctoral thesis, Università Cattolica del Sacro Cuore, 2017. http://hdl.handle.net/10280/35716.
Full textAbstract:
La diseguaglianza dei redditi è comunemente analizzata e misurata attraverso l’impiego di varie misure quali l’indice di Gini, il coefficiente di variazione, l’indice di Theil, la varianza dei logaritmi ed altri ancora (Sen, 1970). A partire dagli anni ’90 l’applicazione di tecniche di scomposizione relative, ad esempio, all’indice di Theil hanno reso possibile quantificare due diverse componenti della diseguaglianza ovvero la disuguaglianza legata allo sforzo individuale e la disuguaglianza dovuta alle ineguali opportunità. Questa seconda componente dipende esclusivamente da fattori esogeni, non controllabili dall’individuo, e, per questa ragione, è a ragione considerata una diseguaglianza “ingiusta”. Alla componente residua della scomposizione è di solito attribuito, invece, il significato di disuguaglianza nello sforzo, ovvero quanto ciascun individuo si è impegnato per raggiungere un determinato obiettivo di successo economico. L’applicazione di questo approccio alle misure di diseguaglianza ha permesso di studiare quale tipo di disuguaglianza prevalga all’interno di un Paese e, soprattutto, quali siano le circostanze esogene che incrementano la disparità nelle opportunità. Il presente lavoro si muove lungo questa linea di ricerca proponendo un metodo per testare il peso relativo delle due componenti e la loro significativita’. Come misura di diseguaglianza si e’ scelto di considerare il coefficiente di variazione in modo da ricondurre il test ad un problema di Analisi della varianza (ANOVA) a piu’ vie. Il test viene presentato facendo riferimento ai dati dell’ISTAT e dell'indagine Bankitalia sui redditi delle famiglie. Dopo quest'analisi preliminare sulle determinanti della diseguaglianza di opportunità in Italia, si utilizza la scomposizione della diseguaglianza nelle sue due componenti: diseguaglianza di opportunità e diseguaglianza legata all'impegno, per definire univocamente l'effetto della diseguaglianza sulla crescita economica. L'analisi econometria è svolta sui dati dell'indagine sulla ricchezza e sui redditi delle famiglie forniti dalla Banca d'Italia. L'effetto viene stimato utilizzando il modello panel dinamico con il metodo di stima GMM.While the analysis of inequality has been central to economic studies for cen- turies, in recent years many studies concentrated on the distinction between in- equality of opportunity (IO) and inequality of returns to effort (IE) and attempted empirical estimates of the two components, e.g. in US and in Europe. The decompo- sition of a general inequality index into these two components allows to analyze the prevalence of fair or unfair income inequality within a country. This paper suggests to test the differences between the two sources of inequality in a simple way using the ANOVA framework adapted to decompose the coefficient of variation, to better suit the requirements of an inequality index. The proposed procedure is applied to the Italian Survey on Income and Living Condition (IT-SILC data, wave 2005 and 2011). The analysis of the results help identifying the circumstances that foster the rise of inequality of opportunities in Italy. Our analysis shows in particular, that father education, region of residence and gender result as the most relevant circumstances determining inequality of opportunity. On the other side, the role of mother education starting from a lower level, as an inequality of opportunity factor, is increasing its influence over time. The decomposition of inequality index in two components allows not only to analyze the prevalence of fair or unfair income inequality in a country, but also to find a clearer relation between inequality and growth. In fact, it is still missing an analysis of the relation between inequality of opportunity and economic growth in Italy. This paper aims at filling in that gap, by using Italian data from Bank of Italys Survey on Income and Wealth from 1998 to 2014. We choose the coefficient of variation to measure inequality of opportunity at the regional level and, then, we studied its relation with economic growth using Dynamic Panel Data models estimated through System- GMM. Finally, in order to check if the coefficient of variation could be a measure as good as the Entropy’s index, I will compare the results of the estimated panel models with the two different inequality of opportunity indeces. We evaluate the effect of inequality of opportunity on different length of the economic growth rate, going from a short term (2 years) to a very long term growth rate (10 years). Our results shows that, in Italy, inequality of opportunity is negative in the short period, but it does not have any effect on long run growth.
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PACE, MARIA LUCIA. "La diseguaglianza di opportunità in Italia." Doctoral thesis, Università Cattolica del Sacro Cuore, 2017. http://hdl.handle.net/10280/35716.
Full textAbstract:
La diseguaglianza dei redditi è comunemente analizzata e misurata attraverso l’impiego di varie misure quali l’indice di Gini, il coefficiente di variazione, l’indice di Theil, la varianza dei logaritmi ed altri ancora (Sen, 1970). A partire dagli anni ’90 l’applicazione di tecniche di scomposizione relative, ad esempio, all’indice di Theil hanno reso possibile quantificare due diverse componenti della diseguaglianza ovvero la disuguaglianza legata allo sforzo individuale e la disuguaglianza dovuta alle ineguali opportunità. Questa seconda componente dipende esclusivamente da fattori esogeni, non controllabili dall’individuo, e, per questa ragione, è a ragione considerata una diseguaglianza “ingiusta”. Alla componente residua della scomposizione è di solito attribuito, invece, il significato di disuguaglianza nello sforzo, ovvero quanto ciascun individuo si è impegnato per raggiungere un determinato obiettivo di successo economico. L’applicazione di questo approccio alle misure di diseguaglianza ha permesso di studiare quale tipo di disuguaglianza prevalga all’interno di un Paese e, soprattutto, quali siano le circostanze esogene che incrementano la disparità nelle opportunità. Il presente lavoro si muove lungo questa linea di ricerca proponendo un metodo per testare il peso relativo delle due componenti e la loro significativita’. Come misura di diseguaglianza si e’ scelto di considerare il coefficiente di variazione in modo da ricondurre il test ad un problema di Analisi della varianza (ANOVA) a piu’ vie. Il test viene presentato facendo riferimento ai dati dell’ISTAT e dell'indagine Bankitalia sui redditi delle famiglie. Dopo quest'analisi preliminare sulle determinanti della diseguaglianza di opportunità in Italia, si utilizza la scomposizione della diseguaglianza nelle sue due componenti: diseguaglianza di opportunità e diseguaglianza legata all'impegno, per definire univocamente l'effetto della diseguaglianza sulla crescita economica. L'analisi econometria è svolta sui dati dell'indagine sulla ricchezza e sui redditi delle famiglie forniti dalla Banca d'Italia. L'effetto viene stimato utilizzando il modello panel dinamico con il metodo di stima GMM.While the analysis of inequality has been central to economic studies for cen- turies, in recent years many studies concentrated on the distinction between in- equality of opportunity (IO) and inequality of returns to effort (IE) and attempted empirical estimates of the two components, e.g. in US and in Europe. The decompo- sition of a general inequality index into these two components allows to analyze the prevalence of fair or unfair income inequality within a country. This paper suggests to test the differences between the two sources of inequality in a simple way using the ANOVA framework adapted to decompose the coefficient of variation, to better suit the requirements of an inequality index. The proposed procedure is applied to the Italian Survey on Income and Living Condition (IT-SILC data, wave 2005 and 2011). The analysis of the results help identifying the circumstances that foster the rise of inequality of opportunities in Italy. Our analysis shows in particular, that father education, region of residence and gender result as the most relevant circumstances determining inequality of opportunity. On the other side, the role of mother education starting from a lower level, as an inequality of opportunity factor, is increasing its influence over time. The decomposition of inequality index in two components allows not only to analyze the prevalence of fair or unfair income inequality in a country, but also to find a clearer relation between inequality and growth. In fact, it is still missing an analysis of the relation between inequality of opportunity and economic growth in Italy. This paper aims at filling in that gap, by using Italian data from Bank of Italys Survey on Income and Wealth from 1998 to 2014. We choose the coefficient of variation to measure inequality of opportunity at the regional level and, then, we studied its relation with economic growth using Dynamic Panel Data models estimated through System- GMM. Finally, in order to check if the coefficient of variation could be a measure as good as the Entropy’s index, I will compare the results of the estimated panel models with the two different inequality of opportunity indeces. We evaluate the effect of inequality of opportunity on different length of the economic growth rate, going from a short term (2 years) to a very long term growth rate (10 years). Our results shows that, in Italy, inequality of opportunity is negative in the short period, but it does not have any effect on long run growth.
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Rouvière, Laurent. "Estimation de densité en dimension élevée et classification de courbes." Phd thesis, Université Montpellier II - Sciences et Techniques du Languedoc, 2005. http://tel.archives-ouvertes.fr/tel-00011624.
Full textAbstract:
L'objectif de cette thèse consiste étudier et approfondir des techniques d'estimation de la densité et de classification dans des espaces de dimension élevée. Nous avons choisi de structurer notre travail en trois parties.La première partie, intitulée compléments sur les histogrammes modifiés, est composée de deux chapitres consacrés l'étude d'une famille d'estimateurs non paramétriques de la densité, les histogrammes modifiés, connus pour posséder de bonnes propriétés de convergence au sens des critères de la théorie de l'information. Dans le premier chapitre, ces estimateurs sont envisagés comme des systèmes dynamiques espace d'états de dimension infinie. Le second chapitre est consacré l'étude de ces estimateurs pour des dimensions suprieures un.
La deuxième partie de la thèse, intituleé méthodes combinatoires en estimation de la densité, se divise en deux chapitres. Nous nous intéressons dans cette partie aux performances distance finie d'estimateurs de la densité sélectionnés à l'intérieur d'une famille d'estimateurs candidats, dont le cardinal n'est pas nécessairement fini. Dans le premier chapitre, nous étudions les performances de ces méthodes dans le cadre de la sélection des différents paramètres des histogrammes modifiés. Nous poursuivons, dans le deuxième chapitre, par la sélection d'estimateurs à noyau dont le paramètre de lissage s'adapte localement au point d'estimation et aux données.
Enfin, la troisième et dernière partie, plus appliquée et indépendante des précédentes, présente une nouvelle méthode permettant de classer des courbes partir d'une décomposition des observations dans des bases d'ondelettes.
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Cheng, Teddy Man Lai. "Application of filtering theory for optimum strategies in stock market investment." Thesis, Queensland University of Technology, 1997.
Find full text
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Hacine-Gharbi, Abdenour. "Sélection de paramètres acoustiques pertinents pour la reconnaissance de la parole." Phd thesis, Université d'Orléans, 2012. http://tel.archives-ouvertes.fr/tel-00843652.
Full textAbstract:
L'objectif de cette thèse est de proposer des solutions et améliorations de performance à certains problèmes de sélection des paramètres acoustiques pertinents dans le cadre de la reconnaissance de la parole. Ainsi, notre première contribution consiste à proposer une nouvelle méthode de sélection de paramètres pertinents fondée sur un développement exact de la redondance entre une caractéristique et les caractéristiques précédemment sélectionnées par un algorithme de recherche séquentielle ascendante. Le problème de l'estimation des densités de probabilités d'ordre supérieur est résolu par la troncature du développement théorique de cette redondance à des ordres acceptables. En outre, nous avons proposé un critère d'arrêt qui permet de fixer le nombre de caractéristiques sélectionnées en fonction de l'information mutuelle approximée à l'itération j de l'algorithme de recherche. Cependant l'estimation de l'information mutuelle est difficile puisque sa définition dépend des densités de probabilités des variables (paramètres) dans lesquelles le type de ces distributions est inconnu et leurs estimations sont effectuées sur un ensemble d'échantillons finis. Une approche pour l'estimation de ces distributions est basée sur la méthode de l'histogramme. Cette méthode exige un bon choix du nombre de bins (cellules de l'histogramme). Ainsi, on a proposé également une nouvelle formule de calcul du nombre de bins permettant de minimiser le biais de l'estimateur de l'entropie et de l'information mutuelle. Ce nouvel estimateur a été validé sur des données simulées et des données de parole. Plus particulièrement cet estimateur a été appliqué dans la sélection des paramètres MFCC statiques et dynamiques les plus pertinents pour une tâche de reconnaissance des mots connectés de la base Aurora2.
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Garcia, Luz Mery González. "Modelos baseados no planejamento para análise de populações finitas." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/45/45133/tde-19062008-183609/.
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Estudamos o problema de obtenção de estimadores/preditores ótimos para combinações lineares de respostas coletadas de uma população finita por meio de amostragem aleatória simples. Nesse contexto, estendemos o modelo misto para populações finitas proposto por Stanek, Singer & Lencina (2004, Journal of Statistical Planning and Inference) para casos em que se incluem erros de medida (endógenos e exógenos) e informação auxiliar. Admitindo que as variâncias são conhecidas, mostramos que os estimadores/preditores propostos têm erro quadrático médio menor dentro da classe dos estimadores lineares não viciados. Por meio de estudos de simulação, comparamos o desempenho desses estimadores/preditores empíricos, i.e., obtidos com a substituição das componentes de variância por estimativas, com aquele de competidores tradicionais. Também, estendemos esses modelos para análise de estudos com estrutura do tipo pré-teste/pós-teste. Também por intermédio de simulação, comparamos o desempenho dos estimadores empíricos com o desempenho do estimador obtido por meio de técnicas clássicas de análise de medidas repetidas e com o desempenho do estimador obtido via análise de covariância por meio de mínimos quadrados, concluindo que os estimadores/ preditores empíricos apresentaram um menor erro quadrático médio e menor vício. Em geral, sugerimos o emprego dos estimadores/preditores empíricos propostos para dados com distribuição assimétrica ou amostras pequenas.We consider optimal estimation of finite population parameters with data obtained via simple random samples. In this context, we extend a finite population mixed model proposed by Stanek, Singer & Lencina (2004, Journal of Statistical Planning and Inference) by including measurement errors (endogenous or exogenous) and auxiliary information. Assuming that variance components are known, we show that the proposed estimators/predictors have the smallest mean squared error in the class of unbiased estimators. Using simulation studies, we compare the performance of the empirical estimators/predictors obtained by replacing variance components with estimates with the performance of a traditional estimator. We also extend the finite population mixed model to data obtained via pretest-posttest designs. Through simulation studies, we compare the performance of the empirical estimator of the difference in gain between groups with the performance of the usual repeated measures estimator and with the performance of the usual analysis of covariance estimator obtained via ordinary least squares. The empirical estimator has smaller mean squared error and bias than the alternative estimators under consideration. In general, we recommend the use of the proposed estimators/ predictors for either asymmetric response distributions or small samples.
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Tomek, Peter. "Approximation of Terrain Data Utilizing Splines." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2012. http://www.nusl.cz/ntk/nusl-236488.
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Pro optimalizaci letových trajektorií ve velmi malé nadmorské výšce, terenní vlastnosti musí být zahrnuty velice přesne. Proto rychlá a efektivní evaluace terenních dat je velice důležitá vzhledem nato, že čas potrebný pro optimalizaci musí být co nejkratší. Navyše, na optimalizaci letové trajektorie se využívájí metody založené na výpočtu gradientu. Proto musí být aproximační funkce terenních dat spojitá do určitého stupne derivace. Velice nádejná metoda na aproximaci terenních dat je aplikace víceroměrných simplex polynomů. Cílem této práce je implementovat funkci, která vyhodnotí dané terenní data na určitých bodech spolu s gradientem pomocí vícerozměrných splajnů. Program by měl vyčíslit více bodů najednou a měl by pracovat v $n$-dimensionálním prostoru.
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KHATTER, KANIKA. "COEFFICIENT ESTIMATES AND SUBORDINATION FOR UNIVALENT FUNCTIONS." Thesis, 2018. http://dspace.dtu.ac.in:8080/jspui/handle/repository/16433.
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Univalent function theory is a branch of geometric function theory which comprises of the various geometric properties of analytic functions. The first milestone in the field of univalent functions theory was achieved by Bieberbach in the year 1916, wherein he proved the second coefficient bound for a function f ∈ S of normalised analytic univalent functions. He also proposed a conjecture for the nth coefficient of the function in the class S in the same year. Bieberbach’s Conjecture states that the coefficients of thethefunction f ∈S satisfy|an|≤nforn = 2,3,4,··· withequalityifandonlyifholds if f is some rotation of the famous Koebe function. Bieberbach’s conjecture paved way for many mathematicians to work in the area of univalent functions and a vast literature is available now.
The present research work focusses on investigating the various types of coefficient estimate problems in geometric function theory such as computing the bounds on the second andthe thirdHankel determinants, theFekete- Szeg¨o coefficientfunctional. The thesis also aims at computing the sharp radius estimates and various inclusion relationships between certain classes of analytic functions. To begin with, Chapter 1 introduces some basic concepts and results in the theory of univalent functions which will be required later in our investigations.
Chapter 2, entitled “Initial Coefficients of Starlike Functions w.r.t. Symmetric Points” aims at studying the functions which are starlike with respect to symmetric points. It is well known that the class of analytic functions f defined on the unit disk satisfying
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viii Preface
Re(zf0(z)/(f(z)− f(−z))) > 0 is a subclass of close-to-convex functions and the nth Taylorcoefficientofthesefunctionsareboundedbyone. However,noboundsareknown for the nth coefficients of functions f ∈ S∗ s (ϕ) satisfying 2zf0(z)/(f(z)− f(−z)) ≺ ϕ(z), except for n = 2,3. Thus, the sharp bound for the fourth coefficient of analytic univalent functions f satisfying the following subordination 2zf0(z)/(f(z)− f(−z)) ≺ ϕ(z) has been obtained. The bound for the fifth coefficient has also been obtained in certain special cases of ϕ including ez and√1+z.
Chapter3, entitled“Fekete-Szeg¨oCoefficientFunctional”,dealswithobtainingthebound for the Fekete-Szeg¨o coefficient functional. Let ϕ be an analytic function with the positive real part satisfying ϕ(0) = 1 and ϕ0(0) > 0. Let f(z) = z + a2z2 + a3z3 +··· be an analytic function satisfying the subordination αf0(z) + (1−α)zf0(z)/f(z) ≺ ϕ(z), (f0(z))α(zf0(z)/f(z))(1−α) ≺ ϕ(z), (f0(z))α(1 + zf00(z)/f0(z))(1−α) ≺ ϕ(z), (f(z)/z)α(zf0(z)/ f(z))(1−α) ≺ ϕ(z) or (f(z)/z)α(1 + zf00(z)/f0(z))(1−α) ≺ ϕ(z). Forfunctionssatisfyingtheabovesubordination,theboundsofFekete-Szeg¨ocoefficient functional have been obtained.
In Chapter 4 entitled “Hankel Determinant of Certain Analytic Functions”, we have obtainedtheboundsforthesecondHankeldeterminant H2(2) = a2a4−a2 3 forthefunction f satisfying αf0(z) + (1−α)zf0(z)/f(z) ≺ ϕ(z), (f0(z))α(zf0(z)/f(z))(1−α) ≺ ϕ(z), (f0(z))α(1 + zf00(z)/f0(z))(1−α) ≺ ϕ(z), (f(z)/z)α(zf0(z)/f(z))(1−α) ≺ ϕ(z) or (f(z)/z)α (1+zf00(z)/f0(z))(1−α) ≺ ϕ(z). Here ϕ is an analytic function with the positiverealpart, ϕ(0) = 1and ϕ0(0) > 0. WehavealsodeterminedthethirdHankeldeterminant H3(1) = a3(a2a4−a2 3)−a4(a4−a2a3) + a5(a3−a2 2) for an analytic function f of the form f(z) = z+∑anzn satisfying either Re(f0(z))α(zf0(z)/f(z))(1−α) > 0 or Re(f0(z))α(1+zf00(z)/f0(z))(1−α) > 0. Our results include some previously known results.
In Chapter 5, entitled “Janowski Starlikeness and Convexity”, certain necessary and sufficientconditionshavebeendeterminedforthefunctions f(z) = z−∑∞ n=2 anzn ∈T, an ≥0,definedonD,tobelongtorenownedsubclassesofJanowskistarlikeandconvex functions. In the same chapter, we have also discussed certain sufficient conditions for
Preface ix
the normalised analytic functions f satisfying (z/f(z))µ = 1+∑∞ n=1 bnzn, µ ∈C to be in the classS∗[A,B] of Janowski starlike functions. In Chapter 6, named “The classes S∗ α,e and SL∗(α)”, we have attempted to study the function f defined on D, with normalisations f(0) = 0 = f0(0)−1, satisfying the subordinations zf0(z)/f(z) ≺ α + (1−α)ez or zf0(z)/f(z) ≺ α + (1−α)√1+z respectively, where 0 ≤ α < 1. The sharp radii has been determined for these functions to belong to several known subclasses of analytic functions. In addition, some inclusion relations and coefficient problems including the bounds for the first four coefficient estimates and the Fekete-Szeg¨o functional have also been obtained.
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Wong, Chung Fai Paddison. "Composite estimators of small-area means and the intraclass correlation coefficient." 2004. http://hdl.handle.net/1993/17916.
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Lu, Chia-Fu, and 盧佳甫. "Genetic Distances among Rice Varieties Estimated by Coefficient of Coancestry and Molecular Markers." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/15032954626877427565.
Full textAbstract:
碩士國立臺灣大學
農藝學研究所
92
Rice (Oryza sativa) is the most important grain crop inTaiwan. Understanding genetic distance among rice varieties may help breeders to utilize the rice germplasm. There are many methods could be used to estimate genetic distance in rice. We used three marker systems: SSR(Simple Squence repeat), AFLP(Ampilified Fragment Lenth Polymorphism), RAPD(Random Amplified Polymorphism DNA) and coefficient of coancestry to determine genetic relatedness among elite major rice varieties. Correlations between molecular marker and coefficient of coancestry estimates are low. It might be caused by bias of coefficient of coancestry estimates , not enough number of molecular markers or markers spread in genome unevenly. Correlations between SSR estimates and coefficient of coancestry is higher and correspond better to pedigree data than other markers. AFLP estimates are roughly similar with SSR, but some estimates appears unreasonable. RAPD estimates are most different when compared with pedigree data.
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Gochis, David J. "Estimated plant water use and crop coefficients for drip-irrigated hybrid polars." Thesis, 1998. http://hdl.handle.net/1957/33819.
Full textAbstract:
Estimations of plant water use can provide great assistance to growers, irrigators,
engineers and water resource planners. This is especially true concerning the introduction
of a new crop into irrigated agriculture. Growing hybrid poplar trees for wood chip stock
and veneer production under agronomic practices is currently being explored as an
alternative to traditional forestry practices. To this author's knowledge, no water use
estimates or crop coefficients, the ratio of a specified crop evapotranspiration to a
reference crop evapotranspiration, have been verified for hybrid poplars grown under drip
irrigation.
Four years of weekly, neutron probe measured, soil water data were analyzed to
determine averaged daily, monthly and seasonal plant water use, or crop
evapotranspiration. The plantation studied was located near Boardman, Oregon on the
arid Columbia River Plateau of North-Central Oregon. Water was applied by periodic
applications via drip irrigation. Irrigation application data, weekly recorded rainfall and
changes in soil water content permitted the construction of a soil water balance model to
calculate weekly hybrid poplar water use. Drainage was estimated by calculating a
potential soil water flux from the lower soil profile. Sites with significant estimated
potential drainage were removed from the analysis so that all sites used in the development
coefficients were calculated using reference evapotranspiration estimates obtained from a
nearby AGRIMET weather station. Mean crop coefficients were estimated using a 2nd
order polynomial with 95% confidence intervals. Plant water use estimates and crop
curves are presented for one, two and three year old hybrid poplars.
Numerical simulation of irrigation practices was attempted using weekly soil water content and soil physical characterization data. Parameter optimization and numerical simulations were attempted using the HYDRUS-2D Soil Water and Solute Transport model. Parameter optimization and numerical simulations were largely unsuccessful due to lack of adequate soil physical and root zone system representation and dimensional differences between drip irrigation processes and the model design used in this study.Graduation date: 1998
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Ya, Bo-Hong, and 葉柏宏. "Using a simplified bat algorithm to estimate the coefficients of digital filters." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/6tghvh.
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Hsiao, Yao-Hsuan, and 蕭瑤軒. "Using the variance components method with model selection to estimate concordance correlation coefficients." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/u77g6t.
Full textAbstract:
碩士國立彰化師範大學
統計資訊研究所
105
Variance components (VC) is an approach for estimating concordance correlation coefficients (CCC) adjusting for covariates, and allowing dependency between replicated samples. However, under VC, a model including all potential explanatory variables may lead to biased parameter estimates. To overcome this problem, the estimation of CCC using the VC approach, as well as applying the conditional Akaike information criterion (CAIC) and conditional Bayesian information criterion (CBIC) for model selection is applied. Simulation studies are conducted to compare linear mixed models (LMM), with and without model-selection via CAIC and CBIC, and we use three indices of intra-, inter- and total concordance correlation coefficients (CCCs) among multiple observers to evaluate agreement for continuous replicated readings. Two applications are illustrated: an assessment of conformity between three optometric devices and an evaluation of agreement in degree of myopia for monozygotic twins.
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Liou, Jyh-Tyng, and 劉志庭. "Estimate fin efficiency of plate finned-tube exchanger and the coefficiet of convection." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/81905711884953199379.
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Wang, Shanshan. "Bootstrapping generalized two stage least square estimates in simultaneous equation model with both fixed and random coefficients." Thesis, 1990. http://spectrum.library.concordia.ca/2634/1/ML56033.pdf.
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Buccheri, Stefano. "Elliptic boundary value problems with measurable coefficients and explosive boundary conditions." Doctoral thesis, 2019. http://hdl.handle.net/11573/1240198.
Full textAbstract:
This Phd thesis follows two different directions, always related to elliptic boundary value problems. The first one concerns existence and regularity results for a wide class of non coercive operators with convection or drift lower order terms. The second one focuses on asymptotic behaviour of large solutions, namely solutions that blows up to infinity at the boundary of the domain, to semilinear elliptic problems.
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Liu, Yong-Zhi, and 劉永智. "Application of the Inverse Method to Estimate Heat transfer Coefficient on CPU Heatsink using Experimental Temperature Data." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/07670067954292036158.
Full textAbstract:
碩士國立成功大學
機械工程學系碩博士班
94
The present study applies the hybrid method of the Laplace transform technique and finite-difference method in conjunction with least-squares scheme and experimental temperature data to predict the heat dissipation and the average convection heat transfer coefficient on CPU heatsink. Due to the thickness of the standard test material is very smaller than its length and width, the one-dimension mathematical model is applied to perform the present inverse analysis. The effects of the fin spacing and fin height on the present estimates can not be negligible for free convection and forced convection. The free convection heat transfer coefficient is increased with increasing the fin spacing and is decreased with increasing the fin height. A comparison of the forced convection heat transfer coefficient between the present estimates and previous results is made in order to evidence the accuracy and reliability of the present inverse scheme.
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Petzoldt, Martin [Verfasser]. "Regularity and error estimators for elliptic problems with discontinuous coefficients / eingereicht von Martin Petzoldt." 2001. http://d-nb.info/962922315/34.
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