Tesi sul tema "Poisson distribution"
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Gu, Kangxia. "Testing the rates of Poisson distribution". Ann Arbor, Mich. : ProQuest, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3213456.
Testo completoTitle from PDF title page (viewed July 6, 2007). Source: Dissertation Abstracts International, Volume: 67-03, Section: B, page: 1504. Advisers: Hon Keung Tony Ng; William R. Schucany. Includes bibliographical references.
Wang, Ling. "Homogeneity tests for several poisson populations". HKBU Institutional Repository, 2008. http://repository.hkbu.edu.hk/etd_ra/909.
Testo completoSILVA, PRISCILLA FERREIRA DA. "A BIVARIATE GARMA MODEL WITH CONDITIONAL POISSON DISTRIBUTION". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2013. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=22899@1.
Testo completoCOORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
PROGRAMA DE SUPORTE À PÓS-GRADUAÇÃO DE INSTS. DE ENSINO
Os modelos lineares generalizados auto regressivos com médias móveis (do inglês GARMA), possibilitam a modelagem de séries temporais de dados de contagem com estrutura de correlação similares aos dos modelos ARMA. Neste trabalho é desenvolvida uma extensão multivariada do modelo GARMA, considerando a especificação de um modelo Poisson bivariado a partir da distribuição de Kocherlakota e Kocherlakota (1992), a qual será denominada de modelo Poisson BGARMA. O modelo proposto é adequado para séries de contagens estacionárias, sendo possível, através de funções de ligação apropriadas, introduzir deterministicamente o efeito de sazonalidade e de tendência. A investigação das propriedades usuais dos estimadores de máxima verossimilhança (viés, eficiência e distribuição) foi realizada através de simulações de Monte Carlo. Com o objetivo de comparar o desempenho e a aderência do modelo proposto, este foi aplicado a dois pares de séries reais bivariadas de dados de contagem. O primeiro par de séries apresenta as contagens mensais de óbitos neonatais para duas faixas de dias de vida. O segundo par de séries refere-se a contagens de acidentes de automóveis diários em dois períodos: vespertino e noturno. Os resultados do modelo proposto, quando comparados com aqueles obtidos através do ajuste de um modelo Gaussiano bivariado Vector Autoregressive (VAR), indicam que o modelo Poisson BGARMA é capaz de capturar de forma adequada as variações de pares de séries de dados de contagem e de realizar previsões com erros aceitáveis, além de produzir previsões probabilísticas para as séries.
Generalized autoregressive linear models with moving average (GARMA) allow the modeling of discrete time series with correlation structure similar to those of ARMA’s models. In this work we developed an extension of a univariate Poisson GARMA model by considerating the specification of a bivariate Poisson model through the distribution presented on Kocherlakota and Kocherlakota (1992), which will be called Poisson BGARMA model. The proposed model not only is suitable for stationary discrete series, but also allows us to take into consideration the effect of seasonality and trend. The investigation of the usual properties of the maximum likelihood estimators (bias, efficiency and distribution) was performed using Monte Carlo simulations. Aiming to compare the performance and compliance of the proposed model, it was applied to two pairs of series of bivariate count data. The first pair is the monthly counts of neonatal deaths to two lanes of days. The second pair refers to counts of daily car accidents in two distinct periods: afternoon and evening. The results of our model when compared with those obtained by fitting a bivariate Vector Autoregressive Gaussian model (VAR) indicates that the Poisson BGARMA model is able to proper capture the variability of bivariate vectors of real time series of count data, producing forecasts with acceptable errors and allowing one to obtain probability forecasts.
Wan, Wai-yin. "Analysis of Poisson count data using Geometric Process model". Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B37836493.
Testo completoWan, Wai-yin, e 溫慧妍. "Analysis of Poisson count data using Geometric Process model". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B37836493.
Testo completoBuchmann, Boris. "Decompounding an estimation problem for the compound poisson distribution /". [S.l.] : [s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=962736910.
Testo completovan, de Ven Remy Julius. "Estimation in mixed Poisson regression models". Thesis, The University of Sydney, 1996. https://hdl.handle.net/2123/26822.
Testo completoPfister, Mark. "Distribution of a Sum of Random Variables when the Sample Size is a Poisson Distribution". Digital Commons @ East Tennessee State University, 2018. https://dc.etsu.edu/etd/3459.
Testo completoRodrigues, Cristiane. "Distribuições em série de potências modificadas inflacionadas e distribuição Weibull binominal negativa". Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/11/11134/tde-28062011-095106/.
Testo completoIn this paper, some result such as moments generating function, recurrence relations for moments and some theorems of the class of modified power series distributions (MPSD) proposed by Gupta (1974) and of the class of inflated modified power series distributions (IMPSD) both at a different point of zero as the zero point are presented. The standard Poisson model, the standard negative binomial model and zero inflated models for count data, ZIP and ZINB, using the techniques of the GLMs, were used to analyse two real data sets together with the normal plot with simulated envelopes. The new distribution Weibull negative binomial (WNB) was proposed. Some mathematical properties of the WNB distribution which is quite flexible in analyzing positive data were studied. It is an important alternative model to the Weibull, and Weibull geometric distributions as they are sub-models of WNB. We demonstrate that the WNB density can be expressed as a mixture of Weibull densities. We provide their moments, moment generating function, plots of the skewness and kurtosis, explicit expressions for the mean deviations, Bonferroni and Lorenz curves, quantile function, reliability and entropy, the density of order statistics and explicit expressions for the moments of order statistics. The method of maximum likelihood is used for estimating the model parameters. The expected information matrix is derived. The usefulness of the new distribution is illustrated in two analysis of real data sets.
Gagnon, Karine. "Distribution et abondance des larves d'éperlan arc-en-ciel (Osmerus mordax) au lac Saint-Jean /". Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2005. http://theses.uqac.ca.
Testo completo余秋萍 e Chau-ping Yu. "Screening method". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1993. http://hub.hku.hk/bib/B31977558.
Testo completoArruda, Marcelo Leme de. "Poisson, Bayes, Futebol e DeFinetti". Universidade de São Paulo, 2000. http://www.teses.usp.br/teses/disponiveis/45/45133/tde-19072012-112940/.
Testo completoThis dissertation deals with the problem of probabilistic previsions for tricotomic events, in addiction with the question of comparison of quality of the previsions, by using calibration curves and the DeFinetti Measure. An application is developed for previsions of soccer games results.
Molina, Gustavo Jose. "Triboemission From Ceramics: Charge Intensity and Energy Distribution Characterizations". Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/28217.
Testo completoPh. D.
Costa, Eliardo Guimarães da. "Aspectos estatísticos da amostragem de água de lastro". Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/45/45133/tde-06052013-172123/.
Testo completoBallast water is a leading dispersing agent of harmful organisms to human health and to the environment and international standards require that the concentration of these organisms in the tank must be less than a prespecified value. Because of time and cost limitations, this inspection requires the use of sampling. Under the assumption of an homogeneous organism concentration in the tank, several authors have used the Poisson distribution for decision making based on hypothesis testing. Since this proposal is unrealistic, we extend the results for cases in which the organism concentration in the tank is heterogeneous, using stratification, nonhomogeneous Poisson processes or assuming that it follows a Gamma distribution, which induces a Negative Binomial distribution for the number of sampled organisms. Furthermore, we propose a novel approach to the problem through estimation techniques based on the Negative Binomial distribution. For practical applications, we implemented computational routines using the R software
Cox, Dennis R. "A business approach for detecting shifts in defect counts modeled by the Poisson distribution /". Available to subscribers only, 2006. http://proquest.umi.com/pqdweb?did=1136092151&sid=8&Fmt=2&clientId=1509&RQT=309&VName=PQD.
Testo completoWan, Chung-him, e 溫仲謙. "Analysis of zero-inflated count data". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B43703719.
Testo completoWan, Chung-him. "Analysis of zero-inflated count data". Click to view the E-thesis via HKUTO, 2009. http://sunzi.lib.hku.hk/hkuto/record/B43703719.
Testo completoRocha, Dimas Francisco. "Pontos aleatórios na natureza: uma introdução aos processos de Poisson e suas aplicações". Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/55/55136/tde-29102018-115306/.
Testo completoThis work the Poisson process was presented and some examples exist and identified in the nature and in situations present in the daily. The Poisson distribution was developed by the mathematician Siméon Denis Poisson in order to apply Probability Theory in criminal trials. At present, it is possible to apply these concep to problems that involve, in general, random phenomena of arrivals, development in colony of bacteria, among others. The Poisson process consists of a suitable probabilistic model for a large number of observable phenomena and is of great importance in the study of queue theory. Throughout the text will be presented and discussed definitions, axioms and conditions in order to clarify and facilitate the understanding of the subject. Some examples that were detailed, thus demonstrating the larger number of possibilities of applications of this theory.
Vergne, Nicolas Prum Bernard. "Chaînes de Markov régulées et approximation de Poisson pour l'analyse de séquences biologiques". S. l. : Evry-Val d'Essonne, 2008. http://www.biblio.univ-evry.fr/theses/2008/2008EVRY0006.pdf.
Testo completoViola, Denise Nunes. "Redução no vício da distribuição da deviance para dados de contagem". Universidade de São Paulo, 2001. http://www.teses.usp.br/teses/disponiveis/11/11134/tde-26032002-113122/.
Testo completoAnalysis of count data presents, in general, can be supposed coming from a Poisson distribution. The analysis of such data have some problems once the underlying distribution of them does not follow the basic assumptions to fit a model. Some tranformations can be suggested, but good results are not always obtained. In the approach of the Generalized Linear Models, the deviance is the statistics that measures the goodness of fit, but its distribution is unknown. Furthermore, considering Poisson distribution data, it is possible to approximate the distribution of the deviance for a chi-square distribution, but such approximation is not good for small sample size. In order of improve this approximation, corrections for the data are suggested, but the results are not good yet. Then, the aim of this work is to propose a new correction factor for data following a Poisson distribution in order to obtain an improvement in the distribution of the deviance for any sample size. For this, just adding a constant at the response variable and, through the expected value of the deviance, such constant is obtained in order to reduce the error in the aproximation. Simulated data from the Poisson distribution were made to calculate the deviance with and without the correction and QQ-plots were used to compare the values of the deviance with the chi-square distribution.
Ho, Pak-kei. "Parametric and non-parametric inference for Geometric Process". Click to view the E-thesis via HKUTO, 2005. http://sunzi.lib.hku.hk/hkuto/record/B31483859.
Testo completoChe, Suisui. "Study on a Hierarchy Model". FIU Digital Commons, 2012. http://digitalcommons.fiu.edu/etd/611.
Testo completoHo, Pak-kei, e 何柏基. "Parametric and non-parametric inference for Geometric Process". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B31483859.
Testo completoComte, Lise. "Changements globaux et distribution spatiale des espèces de poisson d'eau douce : observations récentes et prédictions futures". Toulouse 3, 2013. http://thesesups.ups-tlse.fr/2258/.
Testo completoDespite increasing recognition that recent climate changes are influencing biodiversity, the specific impacts of those changes are still largely unknown. This thesis highlights systematic stream fish species shifts towards higher elevation and upstream habitats, consistent with the geographic variation associated with climate change. The results demonstrated, however, that patterns in climate-driven range shifts were less marked than those attributed to non-climatic drivers, suggesting more severe longer-term effects of climate warming on stream fish and profound consequences on the ability of species to cope with future climate modifications. Nevertheless, the results also provide evidence that several mechanisms are linked to species' evolutionary history and some key biological and ecological traits, allowing species to persist in situ or to track their climatic niche through space. These research findings improve our ability to anticipate future climate change-induced impacts and will assist with initiating effective conservation and management strategies, which can no longer be effectively designed without taking into account climate change
Boiça, Neto Arlindo Leal. "Distribuição espacial e amostragem sequencial de Stegasta bosquella (Chambers, 1875) (Lepidoptera:Gelechiidae) e Enneothrips Flavens Moulton, 1941 (Thysanoptera: Thripidae), em amendoim de porte rasteiro /". Jaboticabal, 2016. http://hdl.handle.net/11449/144633.
Testo completoBanca: Daniel Junior de Andrade
Banca: Francisco Jorge Cividanes
Banca: José Roberto Scarpellini
Banca: Marcelo Francisco Arantes Pereira
Resumo: O amendoim é cultivado em vários estados no Brasil sendo São Paulo o maior produtor, seguido da Bahia e Mato Grosso. Semeadas em épocas diferentes conforme a região do cultivo, a área cultivada do amendoim na safra de 2014/15 no Brasil abrangeu uma área de 107,4 mil hectares, com uma produção média de 3140 kg ha⁻¹. Duas pragas destacam-se pela importância nessa cultura, sendo a lagarta-do-pescoço-vermelho, Stegasta bosquella (Chambers, 1875) (Lepidoptera: Gelechiidae) e o tripes-do-prateamento, Enneothrips flavens Moulton, 1941 (Thysanoptera: Thripidae) por causarem elevados prejuízos econômicos ao agricultor. Na literatura, poucas informações são relatadas de amostragens de pragas no amendoinzeiro. Assim, associando-se esse fato a importância das duas pragas na cultura do amendoim, se fez necessário um estudo por meio de modelos probabilísticos para avaliar as suas distribuições espaciais e amostragens sequenciais, gerando assim futuras informações aos agricultores para o manejo integrado de pragas nessa cultura. Os experimentos foram conduzidos nos anos de 2013/2014 e 2014/2015, em Jaboticabal - SP, utilizando uma área de 1,08 ha, subdividida em 100 parcelas iguais de 108 m² (10,0 x 10,8 m). Em cada parcela foram avaliadas cinco plantas ao acaso, considerando a presença ou não de insetos de S. bosquella e E. flavens. Pelos dados, observaram-se uma distribuição agregada ou moderadamente agregada de E. flavens e uma distribuição aleatória de S. bosquella; o modelo de distribu... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The Peanuts are grown in several states in Brazil and São Paulo is the largest producer, followed by Bahia and Mato Grosso. Sown at different times as the growing region, the cultivated peanut area in 2014/15 crop in Brazil covered an area of 107,400 hectares, with an average production of 3140 kg ha⁻¹. Two pests stand out the importance that culture, and the red-necked peanut worm, Stegasta bosquella (Chambers, 1875) (Lepidoptera: Gelechiidae) and silvering thrips, Enneothrips flavens Moulton, 1941 (Thysanoptera: Thripidae) to cause high economic losses to the farmer. In the literature, little information is reported samplings pest in groundnut. Thus, associating this fact the importance of the two pests in peanut crop, a study using probabilistic models to assess their spatial and sequential sampling distributions made necessary, thus generating further information to farmers for the integrated pest management that culture. The experiments were conducted in the years 2013/2014 and 2014/2015, in Jaboticabal - SP, using an area of 1,08 ha, divided into 100 equal installments of 108 m² (10,0 x 10,8 m). In each plot were evaluated 5 randomly plants considering the presence or absence of E. flavens insects and S. bosquella. From the data, they observed an aggregate or aggregate distribution moderately E. flavens and a random distribution S. bosquella; the distribution model best fit for E. flavens was the negative binomial and larvae of S. bosquella the Poisson distribution model. These results allowed the development of sequential sampling plans in which, thrips and caterpillars have two lines: an upper (S1 = 6.3072 + 1.0680 N), (S1 = 3.2134 + 0.3274 N), the from which it is recommended to control; and bottom (S0 = -6.3072 + 1.0680 N) (S0 = -3.2134 + 0.3274 N), in which control is not recommended, respectively. The results ... (Complete abstract click electronic access below)
Doutor
ESPINOZA, SERGIO EDUARDO CONTRERAS. "STATE SPACE MODEL FOR TIME SERIES WITH BIVARIATE POISSON DISTRIBUTION: AN APPLICATION OF DURBIN-KOOPMAN METODOLOGY". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2004. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=5470@1.
Testo completoORGANIZAÇÕES DOS ESTADOS AMERICANOS
UNIVERSIDAD DEL BÍO-BÍO
Nesta tese, consideramos um modelo de espaço de estado bivariado para dados de contagem. A abordagem usada para resolver integrais não- analíticas que se apresentam no modelo é uma natural extensão da metodologia proposta por Durbin & Koopman - (DK), no sentido de que o Modelo Gaussiano Aproximador deve possuir algumas matrizes de covariâncias diagonais. Esta modificação traz a vantagem de viabilizar o uso do tratamento univariado para séries multivariadas com as recursões de Kalman, o qual, como se sabe, é mais eficiente do que o tratamento usual e facilita o uso de inicializações exatas destas mesmas recursões. O vetor de estado do modelo proposto é definido usando-se abordagem estrutural, onde os elementos do vetor de estado têm interpretação direta como tendência e sazonalidade. Apresentamos exemplos simulados e reais para ilustrar o modelo.
In this thesis we consider a state space model for bivariate observations of count data. The approach used to solve the non analytical integrals that appears as the solution of the resulting non-Gaussian filter is a natural extension of the methodology advocated by Durbin and Koopman (DK). In our approach the aproximated Gaussian Model (AGM), has a diagonal Covariance matrix, while in the original DK, this is a full matrix. This modification make it possible to use univariate Kalman recursoes to construct the AGM, resulting in a computationally more efficient solution for the estimation of a Bivariate Poisson model. This also facilitates the use of exact initialization of those recursions. The state vector is specified using the structural approach, where the state elements are components which have direct interpretation, such as trend and seasonals. In our bivariate set up the dependence between the bivariate vector of time series is accomplished by use of common components which drive both series. We present both simulation and real life examples illustrating the use of our model.
Mejjati-Alami-Lahlou, Nabila. "Distribution cellulaire et subcellulaire de la ciguatoxine chez le poisson et action toxicologique chez le poussin". Bordeaux 1, 1985. http://www.theses.fr/1985BOR10530.
Testo completoCartailler, Jérôme. "Asymptotic of Poisson-Nernst-Planck equations and application to the voltage distribution in cellular micro-domains". Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066297/document.
Testo completoIn this PhD I study how electro-diffusion within biological micro and nano-domains is affected by their shapes using the Poisson-Nernst-Planck (PNP) partial differential equations. I consider non-trivial shapes such as domains with cusp and ellipses. Our goal is to develop models, as well as mathematical tools, to study the electrical properties of micro and nano-domains, to understand better how electrical neuronal signaling is regulated at those scales. In the first part I estimate the steady-state voltage inside an electrolyte confined in a bounded domain, within which we assume an excess of positive charge. I show the mean first passage time in a charged ball depends on the surface and not on the volume. I further study a geometry composed of a ball with an attached cusp-shaped domain. I construct an asymptotic solution for the voltage in 2D and 3D and I show that to leading order expressions for the voltage in 2D and 3D are identical. Finally, I obtain similar conclusion considering an elliptical-shaped domain for which I construct an asymptotic solution for the voltage in 2D and 3D. In the second part, I model the electrical compartmentalization in dendritic spines. Based on numerical simulations, I show how spines non-cylindrical geometry leads to concentration polarization effects. I then compare my model to experimental data of microscopy imaging. I develop a deconvolution method to recover the fast voltage dynamic from the data. I estimate the neck resistance, and we found that, contrary to Ohm's law, the spine neck resistance can be inversely proportional to its radius
Viola, Denise Nunes. "Detecção e modelagem de padrão espacial em dados binários e de contagem". Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/11/11134/tde-21052007-151131/.
Testo completoThe spatial distribution of insects and diseases in commercial fields is important for the efficient application of pesticides. However, in the past this has not been considered in crop management recommendations, experiment planning and sampling plans. The papers presented in this thesis were motivated by two different situation, one envolving count data and the other binary data. The two models used differ in relation to the strategies of the description of the spatial dependence structure. In the the first paper the response variable is a count. In order to characterize the spatial distribution pattern of the onion thrips a survey was carried out to record the number of insects in each development phase on onion plant leaves, on different dates and sample locations, in four rural properties with neighboring farms with different infestation levels and planting methods. The Mantel randomization test was used to test for spatial correlation, and when detected this was modelled by a mixed spatial Poisson model with a geostatistic random component. This model has allowed a spatial pattern characterization as well as the production of prediction maps of susceptibility to levels of infestation in the area. In the second paper the response variable is binary. In this paper a simulation study on pseudo-likelihood estimators of autologistic parameters to verify the effect of different covariate and neighbouring structures is described, with three pest infestation levels and five different spatial correlation coefficient values. An application of the methodology is presented using a bell pepper data set. It is shown that the pseudo-likelihood method can be used when a researcher is interested in the effect of covariates, but should not be used for the estimation of the spatial correlation. A study with different percentages of missing data is made to verify the influency on parameter estimation.
Petrauskienė, Jūratė. "Poisson type approximations for sums of dependent variables". Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2011. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20110307_144536-76639.
Testo completoDisertacijoje tiriamas diskrečių m-priklausomų atsitiktinių dydžių aproksimavimo Puasono tipo matais tikslumas. Silpnai priklausomų atsitiktinių dydžių sumos yra natūralus nepriklausomų atsitiktinių dydžių sumų apibendrinimas. Vis dėlto atsitiktinių dydžių priklausomybė žymiai pasunkina tokių sumų tyrimą. Disertacijoje pagrindinis dėmesys skiriamas dviparametrėms ir triparametrėms diskrečiosioms aproksimacijoms. Gautus rezultatus galima suskirstyti į keturias dalis. Pirmoje dalyje nagrinėjant dviejų narių serijų statistikos aproksimaciją Puasono ir sudėtiniais Puasono skirstiniais buvo nustatyta, kad dviparametrė sudėtinė Puasono aproksimacija yra tikslesnė už Puasono dėsnio asimptotinį skleidinį su vienu asimptotikos nariu. Aproksimacijos tikslumas įvertintas pilnosios variacijos ir lokalioje metrikoje. Specialiu atveju apskaičiuotos asimptotiškai tikslios konstantos. Taip pat nustatyta, kad gautieji įverčiai iš apačios yra tos pačios eilės, kaip ir įverčiai iš viršaus. Antroje dalyje buvo gauta, kad sveikaskaičiai atsitiktiniai dydžiai, tenkinantys Frankeno sąlygos analogą, gali būti naudojami perėjimui nuo m-priklausomų prie 1-priklausomų atsitiktinių dydžių. Nustatyta, kad ženklą keičiančios sudėtinės Puasono aproksimacijos yra tokios pačios tikslumo eilės, kaip žinomi rezultatai nepriklausomų atsitiktinių dydžių sumoms. Trečioje dalyje nustatyta, kad kai atsitiktiniai dydžiai yra simetriniai, tuomet sudėtinio Puasono aproksimacijos tikslumas yra daug geresnis nei... [toliau žr. visą tekstą]
ZHANG, XIAOYI. "ESTIMATING PEAKING FACTORS WITH POISSON RECTANGULAR PULSE MODEL AND EXTREME VALUE THEORY". University of Cincinnati / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1123875661.
Testo completoYu, Fu. "On statistical analysis of vehicle time-headways using mixed distribution models". Thesis, University of Dundee, 2014. https://discovery.dundee.ac.uk/en/studentTheses/d101df63-b7db-45b6-8a03-365b64345e6b.
Testo completoBataineh, Mohammad Saleh, University of Western Sydney, of Science Technology and Environment College e of Science Food and Horticulture School. "Stochastic systems : models and polices [sic]". THESIS_CSTE_SFH_Bataineh_M.xml, 2001. http://handle.uws.edu.au:8081/1959.7/622.
Testo completoMaster of Science (Hons)
ARAÚJO, Raphaela Lima Belchior de. "Família composta Poisson-Truncada: propriedades e aplicações". Universidade Federal de Pernambuco, 2015. https://repositorio.ufpe.br/handle/123456789/16315.
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Este trabalho analisa propriedades da família de distribuições de probabilidade Composta N e propõe a sub-família Composta Poisson-Truncada como um meio de compor distribuições de probabilidade. Suas propriedades foram estudadas e uma nova distribuição foi investigada: a distribuição Composta Poisson-Truncada Normal. Esta distribuição possui três parâmetros e tem uma flexibilidade para modelar dados multimodais. Demonstramos que sua densidade é dada por uma mistura infinita de densidades normais em que os pesos são dados pela função de massa de probabilidade da Poisson-Truncada. Dentre as propriedades exploradas desta distribuição estão a função característica e expressões para o cálculo dos momentos. Foram analisados três métodos de estimação para os parâmetros da distribuição Composta Poisson-Truncada Normal, sendo eles, o método dos momentos, o da função característica empírica (FCE) e o método de máxima verossimilhança (MV) via algoritmo EM. Simulações comparando estes três métodos foram realizadas e, por fim, para ilustrar o potencial da distribuição proposta, resultados numéricos com modelagem de dados reais são apresentados.
This work analyzes properties of the Compound N family of probability distributions and proposes the sub-family Compound Poisson-Truncated as a means of composing probability distributions. Its properties were studied and a new distribution was investigated: the Compound Poisson-Truncated Normal distribution. This distribution has three parameters and has the flexibility to model multimodal data. We demonstrated that its density is given by an infinite mixture of normal densities where in the weights are given by the Poisson-Truncated probability mass function. Among the explored properties of this distribution are the characteristic function end expressions for the calculation of moments. Three estimation methods were analyzed for the parameters of the Compound Poisson-Truncated Normal distribution, namely, the method of moments, the empirical characteristic function (ECF) and the method of maximum likelihood (ML) by EM algorithm. Simulations comparing these three methods were performed and, finally, to illustrate the potential of the proposed distribution numerical results with real data modeling are presented.
DI, STASIO Leonardo. "Voltage Sags (Dips) Measured in Real Interconnected Systems: Methods and Tools to Detect their Origin, and to Forecast Future Performance". Doctoral thesis, Università degli studi di Cassino, 2022. https://hdl.handle.net/11580/90839.
Testo completoHo, Linda Lee. "Análise de contagens multivariadas". Universidade de São Paulo, 1995. http://www.teses.usp.br/teses/disponiveis/3/3136/tde-04072017-101027/.
Testo completoRegression models are presented to analyse multivariate counts from many populations. Due to the random vector characteristic, we consider two classes of probability models: Multivariate Poisson distribution and Multivariate Poisson Log-Normal distribution. The last distribution admits negative and positive correlations between two components of a random vector under study, while other distributions (as Multivariate Poisson) admit only positive correlation. Estimation methods and test of hypothese on the parameters in bivariate case are discussed. The proposed techniques are illustrated by numerical examples, considering counts of two types of defects in 100g of textile fibers produced by four machines, two from one manufacturer and the other two from another one. The results from different regression models are compared. The empirical distribution of Poisson Log-Normal parameter estimations are studied by simulated samples.
Petschel, Ben. "Mean reversion models for weather derivatives /". [St. Lucia, Qld.], 2005. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18872.pdf.
Testo completoGonzález-Sepúlveda, Juan Marcos. "Non market valuation of alcohol consumption for off-highway vehicle parks in North Carolina". abstract and full text PDF (free order & download UNR users only), 2005. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1433398.
Testo completoFan, Huihao. "Test of Treatment Effect with Zero-Inflated Over-Dispersed Count Data from Randomized Single Factor Experiments". University of Cincinnati / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1407404513.
Testo completoPhilippsen, Adriana Strieder. "Abordagem clássica e bayesiana para os modelos de séries temporais da família GARMA com aplicações para dados de contagem". Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-06062011-164536/.
Testo completoIn this work, it was studied the GARMA model to model time series count data with Poisson, binomial and negative binomial discrete conditional distributions. The main goal is to analyze, in the bayesian and classic context, the performance and the quality of fit of the corresponding models, as well as the coverage percentages performance to these models. To achieve this purpose we considered the analysis of Bayesian estimators and credible intervals were analyzed. To the Bayesian study it was proposed a priori distribution joined to the models parameters and sought a posteriori distribution, which one associate with to certain loss functions allows finding out Bayesian estimates to the parameters. In the classical approach, it was calculated the maximum likelihood estimators using the method of Fisher scoring, whose interest was to verify, by simulation, the consistence. With the studies developed we can notice that, both classical and inference Bayesian inference for the parameters of those models, presented good properties analysed through the properties of the punctual estimators. The last stage of the work consisted of the analysis of one real data set, being a real serie corresponding to the admission number because of dengue in the city of Campina Grande. These results show that both the classic and the Bayesian studies are able to describe well the behavior of the serie
Vieira, Nilson Cesar Galvão. "Utilização de dados fornecidos por satélites para determinação de riscos ambientais /". Guaratinguetá, 2016. http://hdl.handle.net/11449/136221.
Testo completoBanca: Eliana Vieira Canettieri
Banca: Andréa Paula Peneluppi
Resumo: Uma das principais causas de morbidade por problemas respiratórias em crianças e idosos é a poluição do ar. Os efeitos na saúde devido a exposição aos poluentes atmosféricos e a baixa qualidade do ar vem causando um aumento nas internações hospitalares. Esse estudo teve como objetivo desenvolver um modelo preditivo através do Modelo Linear Generalizado de Regressão de Poisson para analisar os efeitos da exposição de CO e PM2,5 sobre as internações hospitalares da rede pública no município de Rio Branco, AC, por problemas respiratórios em duas faixas etárias de ambos os sexos, de 0 a 14 anos e de iguais ou mais de 50 anos, durante o período de 01 de julho de 2012 a 30 de junho de 2013. A metodologia utilizada fundamenta-se na pesquisa de estudo ecológico de série temporal. A variável dependente considerada foi o número de internações hospitalares por doenças respiratórias CID 10 correspondentes aos códigos J 00 a J 99, cujos dados foram obtidos pelo DATASUS. As variáveis independentes consideradas foram a concentração diária de poluentes CO e PM2,5 (CCATT-BRAMS), número de queimadas (SISAM), umidade relativa do ar e temperatura mínima (INMET). Ajustes por tendência temporal e efeitos do calendário foram incluídos no modelo. Na análise unipoluente, devido a um incremento interquartil (25%-75%) para o CO (25 ppb) e PM2,5 (1,5 μg/m3 ), observou-se respectivamente, um aumento de 2,1% e 27,9% no aumento de internações para a faixa etária de iguais ou mais de 50 anos. E na análise multipoluente também com incremento interquartil, observou-se um aumento de 17,8% para a faixa etária de 0 a 14 anos e de 34,2% para a faixa etária de iguais ou mais de 50 anos. Os dados obtidos pelo aumento percentual forneceram uma variação de 1,13 % a 34,2 % no risco de internação, ou seja, aproximadamente 348 internações a mais, gerando para os cofres do município um custo de aproximadamente R$ 520 mil
Abstract: A major cause of morbidity due to respiratory problems in children and elderly is air pollution. Health effects due to exposure to air pollution and poor air quality is causing an increase in hospital admissions. This study aimed to develop a predictive model by Generalized Linear Model Poisson Regression to analyze the effects of CO exposure and PM2.5 on the hospitalization of the public network in Rio Branco, AC, for respiratory problems two age groups of both sexes, 0-14 years and of equal or more than 50 years during the period 1 July 2012 to 30 June 2013. The methodology used is based on the number of ecological research study temporal. The dependent variable was considered the number of hospital admissions for respiratory diseases ICD-10 codes corresponding to the J 00 and J 99, whose data were obtained by DATASUS. The independent variables considered were the daily concentration of pollutants CO and PM2.5 (CCATT-BRAMS), number of fires (SISAM), relative humidity and minimum temperature (INMET). Adjustments for time trend and calendar effects were included in the model. In unipoluente analysis, due to an increase interquartile (25% -75%) to CO (25 ppb) and PM2.5 (1.5 g / m3 ) was observed respectively, an increase of 2.1% and 27, 9% increase in hospitalizations for children aged equal or more than 50 years. And in multipoluente analysis also with interquartile increase, there was an increase of 17.8% for the age group 0-14 years and 34.2% for the age group of equal or more than 50 years. And in multipoluente analysis also with interquartile increase, there was an increase of 17.8% for the age group 0-14 years and 34.2 % for the age group of the same or more than 50 years. The data obtained by the percentage increase provided a range of 1.13 % to 34.2% in the risk of hospitalization, or approximately 348 hospitalizations more, generating for the municipal coffers a cost of approximataly R$ 520 thousand
Mestre
Pielaszkiewicz, Jolanta Maria. "Contributions to High–Dimensional Analysis under Kolmogorov Condition". Doctoral thesis, Linköpings universitet, Matematisk statistik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-122610.
Testo completoRalaivaosaona, Dimbinaina. "Limit theorems for integer partitions and their generalisations". Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/20019.
Testo completoENGLISH ABSTRACT: Various properties of integer partitions are studied in this work, in particular the number of summands, the number of ascents and the multiplicities of parts. We work on random partitions, where all partitions from a certain family are equally likely, and determine moments and limiting distributions of the different parameters. The thesis focuses on three main problems: the first of these problems is concerned with the length of prime partitions (i.e., partitions whose parts are all prime numbers), in particular restricted partitions (i.e., partitions where all parts are distinct). We prove a central limit theorem for this parameter and obtain very precise asymptotic formulas for the mean and variance. The second main focus is on the distribution of the number of parts of a given multiplicity, where we obtain a very interesting phase transition from a Gaussian distribution to a Poisson distribution and further to a degenerate distribution, not only in the classical case, but in the more general context of ⋋-partitions: partitions where all the summands have to be elements of a given sequence ⋋ of integers. Finally, we look into another phase transition from restricted to unrestricted partitions (and from Gaussian to Gumbel-distribution) as we study the number of summands in partitions with bounded multiplicities.
AFRIKAANSE OPSOMMING: Verskillende eienskappe van heelgetal-partisies word in hierdie tesis bestudeer, in die besonder die aantal terme, die aantal stygings en die veelvoudighede van terme. Ons werk met stogastiese partisies, waar al die partisies in ’n sekere familie ewekansig is, en ons bepaal momente en limietverdelings van die verskillende parameters. Die teses fokusseer op drie hoofprobleme: die eerste van hierdie probleme gaan oor die lengte van priemgetal-partisies (d.w.s., partisies waar al die terme priemgetalle is), in die besonder beperkte partisies (d.w.s., partisies waar al die terme verskillend is). Ons bewys ’n sentrale limietstelling vir hierdie parameter en verkry baie presiese asimptotiese formules vir die gemiddelde en die variansie. Die tweede hooffokus is op die verdeling van die aantal terme van ’n gegewe veelvoudigheid, waar ons ’n baie interessante fase-oorgang van ’n normaalverdeling na ’n Poisson-verdeling en verder na ’n ontaarde verdeling verkry, nie net in die klassieke geval nie, maar ook in die meer algemene konteks van sogenaamde ⋋-partities: partisies waar al die terme elemente van ’n gegewe ry ⋋ van heelgetalle moet wees.
Coutinho, Letícia Maria Silva. "Comparação empírica dos modelos Cox, log-binominal e Poisson para estimar razões de prevalência". Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/5/5137/tde-19022009-113657/.
Testo completoIntroduction: In cross-sectional studies with binary outcomes, the association between exposure and outcome is estimated with the prevalence ratio (PR). Cox, log-binomial and Poisson regression models have been suggested as statistical methods that yield correct estimates of PR adjusted for confounding variables. Aim: To compare empirically Cox, log-binomial, Poisson and logistic regressions for outcomes with low, intermediate and high prevalence. Methodology: The data came from an epidemiologic population-based cross-sectional study about prevalence of dementia and other mental health problems among older persons from an economically deprived area in the city of Sao Paulo. The diagnosis of dementia (low prevalence), caseness for common mental disorders (intermediate prevalence) and poor self-rated health (high prevalence) were chosen as outcomes of the study. Reference values for point and interval estimates of PR were obtained with the Mantel-Haenszel stratification. Adjusted estimates of PR were then calculated using Cox, log-binomial and Poisson regression models. Crude and adjusted Odds Ratios (OR) were obtained with logistic regression. Results: The point and interval estimates obtained with Poisson and Cox regressions, with robust variance, approximated very well to those obtained with Mantel-Haenszel stratification, independently of the outcome base prevalence, and allowed to control for continuous covariates. The log-binomial model performed slightly worse than the Poisson and Cox models when the outcome had a high prevalence, with difficulty in convergence. Logistic regression produced point and interval estimates that were always higher than those obtained by the other methods, and were particularly higher when the outcome was frequent. Conclusion: The Cox and Poisson models, with robust variance, are good alternatives to logistic regression. Regarding the log-binomial regression model, it is necessary to be alert to restrictions in its use, since it may yield estimates slightly different from those generated by the others methods when the outcome has a high prevalence and also presents difficulty in convergence with the continuous covariate in the model. When analyzing associations in cross-sectional studies, investigators should use regression methods that yield adequate point and interval estimates regardless of the base prevalence of the outcome investigated
Silva, Wesley Bertoli da. "Distribuição de Poisson bivariada aplicada à previsão de resultados esportivos". Universidade Federal de São Carlos, 2014. https://repositorio.ufscar.br/handle/ufscar/4586.
Testo completoFinanciadora de Estudos e Projetos
The modelling of paired counts data is a topic that has been frequently discussed in several threads of research. In particular, we can cite bivariate counts, such as the analysis of sports scores. As a result, in this work we present the bivariate Poisson distribution to modelling positively correlated scores. The possible independence between counts is also addressed through the double Poisson model, which arises as a special case of the bivariate Poisson model. The main characteristics and properties of these models are presented and a simulation study is conducted to evaluate the behavior of the estimates for different sample sizes. Considering the possibility of modeling parameters by insertion of predictor variables, we present the structure of the bivariate Poisson regression model as a general case as well as the structure of an effects model for application in sports data. Particularly, in this work we will consider applications to Brazilian Championship Serie A 2012 data, in which the effects will be estimated by double Poisson and bivariate Poisson models. Once obtained the fits, the probabilities of scores occurence are estimated and then we obtain forecasts for the outcomes. In order to obtain more accurate forecasts, we present the weighted likelihood method from which it will be possible to quantify the relevance of the data according to the time they were observed.
A modelagem de dados provenientes de contagens pareadas e um típico que vem sendo frequentemente abordado em diversos segmentos de pesquisa. Em particular, podemos citar os casos em que as contagens de interesse são bivariadas, como por exemplo na analise de placares esportivos. Em virtude disso, neste trabalho apresentamos a distribuição Poisson bivariada para os casos em que as contagens de interesse sao positivamente correlacionadas. A possível independencia entre as contagens tambem e abordada por meio do modelo Poisson duplo, que surge como caso particular do modelo Poisson bivariado. As principais características e propriedades desses modelos são apresentadas e um estudo de simulação é realizado, visando avaliar o comportamento das estimativas para diferentes tamanhos amostrais. Considerando a possibilidade de se modelar os parâmetros por meio da inserçao de variáveis preditoras, apresentamos a estrutura do modelo de regressão Poisson bivariado como caso geral, bem como a estrutura de um modelo de efeitos para aplicação a dados esportivos. Particularmente, neste trabalho vamos considerar aplicações aos dados da Serie A do Campeonato Brasileiro de 2012, na qual os efeitos serão estimados por meio dos modelos Poisson duplo e Poisson bivariado. Uma vez obtidos os ajustes, estimam-se as probabilidades de ocorrência dos placares e, a partir destas, obtemos previsões para as partidas de interesse. Com o intuito de se obter previsões mais acuradas para as partidas, apresentamos o metodo da verossimilhança ponderada, a partir do qual seria possível quantificar a relevância dos dados em função do tempo em que estes foram observados.
Greer, Brandi A. Young Dean M. "Bayesian and pseudo-likelihood interval estimation for comparing two Poisson rate parameters using under-reported data". Waco, Tex. : Baylor University, 2008. http://hdl.handle.net/2104/5283.
Testo completoEger, Karl-Heinz. "A CUSUM test for discrete monitoring of intensity of a Poisson process". Universitätsbibliothek Chemnitz, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-201000862.
Testo completoLee, Brendan Chee-Seng Banking & Finance Australian School of Business UNSW. "Incorporating discontinuities in value-at-risk via the poisson jump diffusion model and variance gamma model". Awarded by:University of New South Wales, 2007. http://handle.unsw.edu.au/1959.4/37201.
Testo completoWetie, Ngongang Ariane. "Seismic and Volcanic Hazard Analysis for Mount Cameroon Volcano". Diss., University of Pretoria, 2016. http://hdl.handle.net/2263/60871.
Testo completoDissertation (MSc)--University of Pretoria, 2016.
Geology
MSc
Unrestricted
Chalant, Anaïs. "Etude macroécologique de la distribution, diversité et vulnérabilité des poissons diadromes". Thesis, Paris, Muséum national d'histoire naturelle, 2016. http://www.theses.fr/2016MNHN0018/document.
Testo completoDiadromous species exhibit a life-cycle implying migrations between freshwater and ocean. Diadromy is observed in many fish lineages suggesting that adaptive traits are associated with this strategy such as better dispersal ability and more efficient tracking of the spatio-temporal variability of the environment. One of the hypotheses that have been put forward to explain the evolution and persistence of diadromy states that the purpose of migrations is to select environmental conditions that will optimize pre-reproductive growth. Growing at sea and reproducing in river (anadromy) is supposed to be favored when freshwater primary productivity is lower in freshwater than in the nearby sea. The reverse (growing in freshwater, reproducing in ocean; catadromy) is expected when productivity is higher in sea than in freshwater. According to our study, conducted at a global scale, this hypothesis holds true. In addition it is shown that diadromous species are overrepresented in species poor rivers and/or in those that have been open to colonization after the retreat of glaciers after the last glacial maximum. Because of their dispersal ability, diadromous species are also over-represented on oceanic islands. Biodiversity on islands is classical topic of biogeography but yet few studies have dealt with freshwater fishes. In our study of fish communities from the Polynesian islands, we demonstrate the generality of a model initially built to explain terrestrial biodiversity on oceanic islands. As predicted by this model, species richness peaks at peaks at intermediate island age. Also revealed by our results are a positive relationship between island elevation and species richness and a decrease in species richness as the distance from the nearest biodiversity hotspot increases. Diadromy has been a successful strategy over geologic times but in face to human activities it seems to contribute to extinction proneness, as exemplified by the numerous diadromous species red listed by IUCN. Paradoxically, our study about the biological and ecological traits shared by the freshwater fishes that have been recently globally extinct does not suggest that diadromy has been a major factor. This study points to endemism and restricted geographic range size as the major determinants of extinction. It seems that because of their dispersal abilities, diadromous species tend to have widespread historical distributions and, even if many species are declining, this prevented most of them from being entirely extirpated. This is well exemplified by the European sturgeon (Asipenser sturio), formerly widely distributed over Europe and now restricted to one reproducing population in the Garonne River, because of dramatic population collapses after 1850. To have a better idea of the fate of this species before 1850, we analyzed archaeozoological records. According to our analyses, sturgeons started to decline a long time ago, about 2500 years ago. Using reconstructed past temperatures, our analyses show that a high temperature increases the probability of finding this species in archeological remains but cannot explain entirely the observed decline. This suggests that human activities impacted sturgeon populations well before the industrial revolution. This thesis by synthesizing species occurrence data over different spatial and temporal scales contributed to a better knowledge about the diversity and vulnerability of diadromous fishes