Dissertations / Theses on the topic 'Concentration inequalities'
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Sammer, Marcus D. "Aspects of mass transportation in discrete concentration inequalities." Diss., Georgia Institute of Technology, 2005. http://etd.gatech.edu/theses/available/etd-04112005-163457/unrestricted/sammer%5Fmarcus%5Fd%5F200505%5Fphd.pdf.
Full textIncludes bibliographical references (p. 108-110). Also available online via the Georgia Institute of Technology, website (http://etd.gatech.edu/).
Tiep, Pham H., and Van H. Vu. "Non-abelian Littlewood–Offord inequalities." ACADEMIC PRESS INC ELSEVIER SCIENCE, 2016. http://hdl.handle.net/10150/621530.
Full textBarthe, F., and barthe@math univ-mlv fr. "Levels of Concentration Between Exponential and Gaussian." ESI preprints, 2001. ftp://ftp.esi.ac.at/pub/Preprints/esi1008.ps.
Full textMercadier, Mathieu. "Banking risk indicators, machine learning and one-sided concentration inequalities." Thesis, Limoges, 2020. http://aurore.unilim.fr/theses/nxfile/default/a5bdd121-a1a2-434e-b7f9-598508c52104/blobholder:0/2020LIMO0001.pdf.
Full textThis doctoral thesis is a collection of three essays aiming to implement, and if necessary to improve, financial risk measures and to assess banking risks, using machine learning methods. The first chapter offers an elementary formula inspired by CreditGrades, called E2C, estimating CDS spreads, whose accuracy is improved by a random forest algorithm. Our results emphasize the E2C's key role and the additional contribution of a specific company's debt rating and size. The second chapter infers a one-sided version of the inequality bounding the probability of a unimodal random variable. Our results show that the unimodal assumption for stock returns is generally accepted, allowing us to refine individual risk measures' bounds, to discuss implications for tail risk multipliers, and to infer simple versions of bounds of systemic measures. The third chapter provides a decision support tool clustering listed banks depending on their riskiness using an adjusted version of the k-means algorithm. This entirely automatic process is based on a very large set of stand-alone and systemic risk indicators reduced to representative factors. The obtained results are aggregated per country and region, offering the opportunity to study zones of fragility. They underline the importance of paying a particular attention to the ambiguous impact of banks' size on systemic measures
Moles, Jordan. "On concentration inequalities for equilibrium states in lattice and symbolic dynamical systems." Thesis, Institut polytechnique de Paris, 2020. http://www.theses.fr/2020IPPAX102.
Full textThis thesis deals with the existence of Gaussian concentration for sufficiently mixing equilibrium states for lattice systems. Moreover, we show that such a property ensures uniqueness.In the first chapter, we show that if an equilibrium state associated to a shift-invariant and absolutely summable potential satisfies a Gaussian concentration bound then it is à fortiori mixing and unique em i.e. there is no phase transition.Thereafter, We study numerically a particular physical model which allows phase transition to occur: the ferromagnetic Ising model in two dimensions. We evaluate concentration constants through classical estimates at all temperature. Thank to the behavior of these parameters, we emphasize divergence of the Gaussian concentration constant at the critical temperature deduce that such property doesn't hold.Later on, we prove that the Gaussian concentration behavior holds for all temperature above the critical one for this model.Then, we dedicate a chapter to the study of an unidimensional symbolic dynamics on a finite alphabet: chains with complete connections. In particular, we study the concentration properties of a unique equilibrium state associated to a potential (or transition probability) satisfying Walters' condition.In the end, we review the high-noise regime in probabilistic cellular automata. In particular, we prove that in this regime, the probabilistic cellular automata satisfies a Gaussian concentration for a certain class of spatio-temporal observables
Altemeier, Daniel [Verfasser], and Barbara [Akademischer Betreuer] Gentz. "Concentration Inequalities for Nonautonomous Stochastic Delay Differential Equations / Daniel Altemeier ; Betreuer: Barbara Gentz." Bielefeld : Universitätsbibliothek Bielefeld, 2017. http://d-nb.info/1150182024/34.
Full textLucas, Leonard Joseph Ortiz Michael Ortiz Michael. "Uncertainty quantification using concentration-of-measure inequalities /cLeonard J. Lucas ; Michael Ortiz, committee chair and advisor." Diss., Pasadena, Calif. : California Institute of Technology, 2009. http://resolver.caltech.edu/CaltechETD:etd-05292009-165215.
Full textTsawe, Mluleki. "Inequalities in the use of maternal and reproductive health services in Sierra Leone." University of the Western Cape, 2019. http://hdl.handle.net/11394/6660.
Full textThis thesis extends the literature on the trends and magnitude of health inequalities in the area of maternal and reproductive health services in Sierra Leone, and particular across sub-Saharan Africa. It attempted to provide a good understanding of, not only the determinants of maternal and reproductive healthcare use, but also factors that enable health inequalities to exist in Sierra Leone. This is an appropriate topic in population health studies as it aims to address important questions on the research agenda in the context of sub-Saharan Africa, particularly in a country with poor health outcomes such as Sierra Leone. A proper understanding of not only the coverage rates of population health outcomes but also the extent of health inequalities as well as the factors that contribute to these inequalities is crucial for any government. The thesis applied various techniques in the analysis of DHS data (from 2008 and 2013 rounds) in an attempt to answer the research questions.
Kroll, Martin [Verfasser], and Martin [Akademischer Betreuer] Schlather. "Concentration inequalities for Poisson point processes with applications to non-parametric statistics / Martin Kroll ; Betreuer: Martin Schlather." Mannheim : Universitätsbibliothek Mannheim, 2017. http://d-nb.info/1129105415/34.
Full textAugeri, Fanny. "Principes de grandes déviations pour des modèles de matrices aléatoires." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30075/document.
Full textThis thesis falls within the theory of random matrices and large deviations techniques. We mainly consider large deviations problems which involve a heavy-tail phenomenon. In a first phase, we will focus on finding concentration inequalities for different spectral functionals which reflect their large deviations behavior, for random Hermitian matrices satisfying a concentration property indexed by some alpha ∈ (0,2]. Then we will present the large deviations principle we obtained for the largest eigenvalue of Wigner matrices without Gaussian tails, in line with the work of Bordenave and Caputo. Another example of heavy-tail phenomenon is given by the large deviations of traces of random matrices which we investigate in three cases: the case of beta-ensembles, of Gaussian Wigner matrices, and the case of Wigner matrices without Gaussian tails. The Gaussian case was the opportunity to revisit Borell and Ledoux's proof of the large deviations of Wiener chaoses, which we investigate further by proposing a general large deviations statement, allowing us to give another proof of the large deviations principles known for the Wigner matrices without Gaussian tail. Finally, we give a new proof of the large deviations principles for the beta-ensembles with a quadratic potential, which relies only on the tridiagonal representation of these models. In particular, this result gives a proof of the large deviations of the GUE and GOE which does not rely on the knowledge of the law of the spectrum
Siegel, Martin Verfasser], Karl C. [Akademischer Betreuer] [Mosler, and Markus [Akademischer Betreuer] Lüngen. "Measuring variations in health inequalities: Semiparametric modeling of the concentration index / Martin Siegel. Gutachter: Karl Mosler ; Markus Lüngen." Köln : Universitäts- und Stadtbibliothek Köln, 2012. http://d-nb.info/1038266459/34.
Full textBandyopadhyay, Jogia. "Optimal concentration for SU(1,1) coherent state transforms and an analogue of the Lieb-Wehrl conjecture for SU(1,1)." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24801.
Full textCommittee Chair: Eric A. Carlen; Committee Member: Jean Bellissard; Committee Member: Michael Loss; Committee Member: Predrag Cvitanovic.
Aimino, Romain. "Vitesse de mélange et théorèmes limites pour les systèmes dynamiques aléatoires et non-autonomes." Thesis, Toulon, 2014. http://www.theses.fr/2014TOUL0005/document.
Full textThe first chapter, devoted to random systems, we establish an abstract functional framework, including a large class of expanding systems in dimension 1 and higher, under which we can prove annealed limit theorems. We also give a necessary and sufficient condition for the quenched central limit theorem to hold in dimension 1. In chapter 2, after an introduction to the notion of non-autonomous system, we study an example consisting of a family of maps of the unit interval with a common neutral fixed point, and we show that this system admits a polynomial loss of memory. The chapter 3 is devoted to concentration inequalities. We establish such inequalities for random and non-autonomous dynamical systems in dimension 1, and we study some of their applications. In chapter 4, we study dynamical Borel-Cantelli lemmas for the Rauzy-Veech-Zorich induction, and we present some results concerning statistics of recurrence for this map
Bousquet, Olivier Jean André. "Inégalités de concentration et théorie des processus empiriques appliqués à l'analyse d'algorithmes d'apprentissage." Palaiseau, Ecole polytechnique, 2002. http://www.theses.fr/2002EPXX0031.
Full textCiolek, Gabriela. "Bootstrap and uniform bounds for Harris Markov chains." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLT024/document.
Full textThis thesis concentrates on some extensions of empirical processes theory when the data are Markovian. More specifically, we focus on some developments of bootstrap, robustness and statistical learning theory in a Harris recurrent framework. Our approach relies on the regenerative methods that boil down to division of sample paths of the regenerative Markov chain under study into independent and identically distributed (i.i.d.) blocks of observations. These regeneration blocks correspond to path segments between random times of visits to a well-chosen set (the atom) forming a renewal sequence. In the first part of the thesis we derive uniform bootstrap central limit theorems for Harris recurrent Markov chains over uniformly bounded classes of functions. We show that the result can be generalized also to the unbounded case. We use the aforementioned results to obtain uniform bootstrap central limit theorems for Fr´echet differentiable functionals of Harris Markov chains. Propelledby vast applications, we discuss how to extend some concepts of robustness from the i.i.d. framework to a Markovian setting. In particular, we consider the case when the data are Piecewise-determinic Markov processes. Next, we propose the residual and wild bootstrap procedures for periodically autoregressive processes and show their consistency. In the second part of the thesis we establish maximal versions of Bernstein, Hoeffding and polynomial tail type concentration inequalities. We obtain the inequalities as a function of covering numbers and moments of time returns and blocks. Finally, we use those tail inequalities toderive generalization bounds for minimum volume set estimation for regenerative Markov chains
Laquerrière, Benjamin. "Interpolation et comparaison de certains processus stochastiques." Phd thesis, Université de La Rochelle, 2012. http://tel.archives-ouvertes.fr/tel-00823901.
Full textPeel, Thomas. "Algorithmes de poursuite stochastiques et inégalités de concentration empiriques pour l'apprentissage statistique." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4769/document.
Full textThe first part of this thesis introduces new algorithms for the sparse encoding of signals. Based on Matching Pursuit (MP) they focus on the following problem : how to reduce the computation time of the selection step of MP. As an answer, we sub-sample the dictionary in line and column at each iteration. We show that this theoretically grounded approach has good empirical performances. We then propose a bloc coordinate gradient descent algorithm for feature selection problems in the multiclass classification setting. Thanks to the use of error-correcting output codes, this task can be seen as a simultaneous sparse encoding of signals problem. The second part exposes new empirical Bernstein inequalities. Firstly, they concern the theory of the U-Statistics and are applied in order to design generalization bounds for ranking algorithms. These bounds take advantage of a variance estimator and we propose an efficient algorithm to compute it. Then, we present an empirical version of the Bernstein type inequality for martingales by Freedman [1975]. Again, the strength of our result lies in the variance estimator computable from the data. This allows us to propose generalization bounds for online learning algorithms which improve the state of the art and pave the way to a new family of learning algorithms taking advantage of this empirical information
Ciolek, Gabriela. "Bootstrap and uniform bounds for Harris Markov chains." Electronic Thesis or Diss., Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLT024.
Full textThis thesis concentrates on some extensions of empirical processes theory when the data are Markovian. More specifically, we focus on some developments of bootstrap, robustness and statistical learning theory in a Harris recurrent framework. Our approach relies on the regenerative methods that boil down to division of sample paths of the regenerative Markov chain under study into independent and identically distributed (i.i.d.) blocks of observations. These regeneration blocks correspond to path segments between random times of visits to a well-chosen set (the atom) forming a renewal sequence. In the first part of the thesis we derive uniform bootstrap central limit theorems for Harris recurrent Markov chains over uniformly bounded classes of functions. We show that the result can be generalized also to the unbounded case. We use the aforementioned results to obtain uniform bootstrap central limit theorems for Fr´echet differentiable functionals of Harris Markov chains. Propelledby vast applications, we discuss how to extend some concepts of robustness from the i.i.d. framework to a Markovian setting. In particular, we consider the case when the data are Piecewise-determinic Markov processes. Next, we propose the residual and wild bootstrap procedures for periodically autoregressive processes and show their consistency. In the second part of the thesis we establish maximal versions of Bernstein, Hoeffding and polynomial tail type concentration inequalities. We obtain the inequalities as a function of covering numbers and moments of time returns and blocks. Finally, we use those tail inequalities toderive generalization bounds for minimum volume set estimation for regenerative Markov chains
Ben-Hamou, Anna. "Concentration et compression sur alphabets infinis, temps de mélange de marches aléatoires sur des graphes aléatoires." Thesis, Sorbonne Paris Cité, 2016. http://www.theses.fr/2016USPCC197/document.
Full textThis document presents the problems I have been interested in during my PhD thesis. I begin with a concise presentation of the main results, followed by three relatively independent parts. In the first part, I consider statistical inference problems on an i.i.d. sample from an unknown distribution over a countable alphabet. The first chapter is devoted to the concentration properties of the sample's profile and of the missing mass. This is a joint work with Stéphane Boucheron and Mesrob Ohannessian. After obtaining bounds on variances, we establish Bernstein-type concentration inequalities and exhibit a vast domain of sampling distributions for which the variance factor in these inequalities is tight. The second chapter presents a work in progress with Stéphane Boucheron and Elisabeth Gassiat, on the problem of universal adaptive compression over countable alphabets. We give bounds on the minimax redundancy of envelope classes, and construct a quasi-adaptive code on the collection of classes defined by a regularly varying envelope. In the second part, I consider random walks on random graphs with prescribed degrees. I first present a result obtained with Justin Salez, establishing the cutoff phenomenon for non-backtracking random walks. Under certain degree assumptions, we precisely determine the mixing time, the cutoff window, and show that the profile of the distance to equilibrium converges to the Gaussian tail function. Then I consider the problem of comparing the mixing times of the simple and non-backtracking random walks. The third part is devoted to the concentration properties of weighted sampling without replacement and corresponds to a joint work with Yuval Peres and Justin Salez
Ribeiro, Sónia. "Desigualdades socioeconómicas na doença cardiovascular em Portugal : estudo baseado no 4º Inquérito Nacional de Saúde." Master's thesis, Escola Nacional de Saúde Pública. Universidade Nova de Lisboa, 2010. http://hdl.handle.net/10362/6139.
Full textDegenne, Rémy. "Impact of structure on the design and analysis of bandit algorithms." Thesis, Université de Paris (2019-....), 2019. http://www.theses.fr/2019UNIP7179.
Full textIn this Thesis, we study sequential learning problems called stochastic multi-armed bandits. First a new bandit algorithm is presented. The analysis of that algorithm uses confidence intervals on the mean of the arms reward distributions, as most bandit proofs do. In a parametric setting, we derive concentration inequalities which quantify the deviation between the mean parameter of a distribution and its empirical estimation in order to obtain confidence intervals. These inequalities are presented as bounds on the Kullback-Leibler divergence. Three extensions of the stochastic multi-armed bandit problem are then studied. First we study the so-called combinatorial semi-bandit problem, in which an algorithm chooses a set of arms and the reward of each of these arms is observed. The minimal attainable regret then depends on the correlation between the arm distributions. We consider then a setting in which the observation mechanism changes. One source of difficulty of the bandit problem is the scarcity of information: only the arm pulled is observed. We show how to use efficiently eventual supplementary free information (which do not influence the regret). Finally a new family of algorithms is introduced to obtain both regret minimization and est arm identification regret guarantees. Each algorithm of the family realizes a trade-off between regret and time needed to identify the best arm. In a second part we study the so-called pure exploration problem, in which an algorithm is not evaluated on its regret but on the probability that it returns a wrong answer to a question on the arm distributions. We determine the complexity of such problems and design with performance close to that complexity
Philips, Petra Camilla, and petra philips@gmail com. "Data-Dependent Analysis of Learning Algorithms." The Australian National University. Research School of Information Sciences and Engineering, 2005. http://thesis.anu.edu.au./public/adt-ANU20050901.204523.
Full textZoghbi, Ana Carolina Pereira. "Desigualdades sócio-econômicas na saúde: uma análise do Estado de São Paulo e do município de Ribeirão Preto." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/96/96131/tde-04012007-103039/.
Full textThe aim of this work was to evaluated eventual socio-economic health inequalities in State of São Paulo and Municipal District of Ribeirão Preto. The data related to São Paulo were obtained from the National Survey by Households Sampling (PNAD) of 2003, elaborated by the Brazilian Institute of Geography and Statistics (IBGE), which presents individual and household characteristics. The Ribeirão Preto database consists in a cohort developed by the Pediatrics and Puericulture Department of the Ribeirão Preto Medical School-USP in the period between June of 1978 and May of 1979. It was analyzed the distribution of the health variables (chronicle diseases and self-assessment) between quintiles of income. In addition, it were calculated Health Concentration Indexes, whose construction is similar to the Gini Indexes. This index considers the accumulated proportion of certain disease and the accumulated proportion of the population, ordered according to the income. It was also estimated the impacts of some explanatory variables on the probability of presenting certain disease or self-assessing in certain way. For the State of São Paulo it was considered as explanatory variables: education, gender, race and age (all dummy variables). For the Municipal District of Ribeirão Preto it was considered as explanatory variables: education, the fact that one of the parents has the disease, the fact that one of the parents has another chronicle disease, gender and race (all dummy variables). It was employed the Probit method to analyze the impact on the probability of presenting certain illness. For the self-assessment variable, the Ordered Probit method was employed. Generally, the results for the State of São Paulo showed inequality in benefit of the richest. Besides, in general, the higher the education the lower is the probability of having certain disease. In the case of Ribeirão Preto, the results weren?t totally conclusive, since the fourth stage of the cohort presented individuals between 22 and 26 years old, whose age class show little incidence of chronicle diseases. Nevertheless, one can note that the health of the parents influences the health of their sons. As for the fact that certain characteristics are passed on, as for the fact that ill parents should not have large expenses with the health of their sons.
Hu, Peng. "Méthodes particulaires et applications en finance." Thesis, Bordeaux 1, 2012. http://www.theses.fr/2012BOR14530/document.
Full textThis thesis is concerned with the analysis of these particle models for computational finance.The manuscript is organized in four chapters. Each of them could be read separately.The first chapter provides an overview of the thesis, outlines the motivation and summarizes the major contributions. The second chapter gives a general in- troduction to the theory of interacting particle methods, with an overview of their applications to computational finance. We survey the main techniques and results on interacting particle systems and explain how they can be applied to the numerical solution of a variety of financial applications; to name a few: pricing complex path dependent European options, computing sensitivities, pricing American options, as well as numerically solving partially observed control and estimation problems.The pricing of American options relies on solving a backward evolution equation, termed Snell envelope in stochastic control and optimal stopping theory. The third and fourth chapters focus on the analysis of the Snell envelope and its variation to several particular cases. Different type of particle models are proposed and studied
Tanguy, Kévin. "Quelques inégalités de superconcentration : théorie et applications." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30078/document.
Full textThe thesis focuses on the superconcentration phenomenon which appears in the study of the fluctuations of various moelds from current research (random matrices, spin glasses, discrete Gaussien free field, percolation,...). More precisely, the thesis mainly deals with superconcentration inequalities at an exponentiel level ; in particular for supremum of familu of Gaussian random variables. The principal tools used during this study are the hypercontractive property satisfied by some Markov semi-groups ; this approach leads to an extension of higher order of an inequality due to M. Talagrand. The first part of the thesis exposes the fundamental notions of concentration of measure, interpolation methods with Markovians semi-groups, functional inequalities, optimal transport and isoperimetry. Then, a survey of the literature concerning superconcentration phenomenon is done. The second part of the manuscript bring together, in different chapters, the results obtained during the thesis. Most of them are based on the dynamical representation of the variance along the semi-group of Ornstein-Uhlenbeck and its hypercontractive property. New ineqaulities are obtained at an exponential level and are illustrated on examples coming from extreme theory. This hypercontractive framework also gave birth to a new inequality on the discrete cube which leads to an application on the influence of second order of boolean functions. Finally, the last chapter is about the superconcentration phenomenon with an optimal transport approach. Some non asymptotic bounds on the variance and deviations inequalities are obtained for the maximum of an i.i.d. sample. Again, illustrations for usual laws of probability, belonging to different domain of attraction from extreme theory, are given
Pace, Michele. "Stochastic models and methods for multi-object tracking." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2011. http://tel.archives-ouvertes.fr/tel-00651396.
Full textKlochkov, Yegor. "Modelling Financial and Social Networks." Doctoral thesis, Humboldt-Universität zu Berlin, 2019. http://dx.doi.org/10.18452/20557.
Full textIn this work we explore some ways of studying financial and social networks, a topic that has recently received tremendous amount of attention in the Econometric literature. Chapter 2 studies risk spillover effect via Multivariate Conditional Autoregressive Value at Risk model introduced in White et al. (2015). We are particularly interested in application to non-stationary time series and develop a sequential test procedure that chooses the largest available interval of homogeneity. Our approach is based on change point test statistics and we use a novel Multiplier Bootstrap approach for the evaluation of critical values. In Chapter 3 we aim at social networks. We model interactions between users through a vector autoregressive model, following Zhu et al. (2017). To cope with high dimensionality we consider a network that is driven by influencers on one side, and communities on the other, which helps us to estimate the autoregressive operator even when the number of active parameters is smaller than the sample size. Chapter 4 is devoted to technical tools related to covariance cross-covariance estimation. We derive uniform versions of the Hanson-Wright inequality for a random vector with independent subgaussian components. The core technique is based on the entropy method combined with truncations of both gradients of functions of interest and of the coordinates itself. We provide several applications of our techniques: we establish a version of the standard Hanson-Wright inequality, which is tighter in some regimes. Extending our results we show a version of the dimension-free matrix Bernstein inequality that holds for random matrices with a subexponential spectral norm. We apply the derived inequality to the problem of covariance estimation with missing observations and prove an improved high probability version of the recent result of Lounici (2014).
Kroon, Rodney Stephen. "A framework for estimating risk." Thesis, Link to the online version, 2008. http://hdl.handle.net/10019.1/1104.
Full textJeunesse, Paulien. "Estimation non paramétrique du taux de mort dans un modèle de population générale : Théorie et applications. A new inference strategy for general population mortality tables Nonparametric adaptive inference of birth and death models in a large population limit Nonparametric inference of age-structured models in a large population limit with interactions, immigration and characteristics Nonparametric test of time dependance of age-structured models in a large population limit." Thesis, Paris Sciences et Lettres (ComUE), 2019. http://www.theses.fr/2019PSLED013.
Full textIn this thesis, we study the mortality rate in different population models to apply our results to demography or biology. The mathematical framework includes statistics of process, nonparametric estimations and analysis.In a first part, an algorithm is proposed to estimate the mortality tables. This problematic comes from actuarial science and the aim is to apply our results in the insurance field. This algorithm is founded on a deterministic population model. The new estimates we gets improve the actual results. Its advantage is to take into account the global population dynamics. Thanks to that, births are used in our model to compute the mortality rate. Finally these estimations are linked with the precedent works. This is a point of great importance in the field of actuarial science.In a second part, we are interested in the estimation of the mortality rate in a stochastic population model. We need to use the tools coming from nonparametric estimations and statistics of process to do so. Indeed, the mortality rate is a function of two parameters, the time and the age. We propose minimax optimal and adaptive estimators for the mortality and the population density. We also demonstrate some non asymptotics concentration inequalities. These inequalities quantifiy the deviation between the stochastic process and its deterministic limit we used in the first part. We prove that our estimators are still optimal in a model where the mortality is influenced by interactions. This is for example the case for the logistic population.In a third part, we consider the testing problem to detect the existence of interactions. This test is in fact designed to detect the time dependance of the mortality rate. Under the assumption the time dependance in the mortality rate comes only from the interactions, we can detect the presence of interactions. Finally we propose an algorithm to do this test
Zidi, Najoua. "Études économiques sur les inégalités sociales de santé." Electronic Thesis or Diss., Paris 8, 2019. http://www.theses.fr/2019PA080053.
Full textThis dissertation addresses social inequalities in health by attempting to identify the main determinants of social inequalities in health. The purpose of this research is to examine the impact of health systems and their reforms on social inequality in health, with an emphasis on a deeper understanding of the ways and mechanisms by which socio-economic factors reduce or increase health inequalities. The aim is to understand social inequalities in health and identify their main determinants, whether in Tunisia or by comparing Tunisia with other countries.Based on a review of the literature on the determinants of social inequalities in health, we propose a conceptual analysis of the links between health and socio-economic status, including the income of individuals and countries by studying the impact of the latter on the health status of a population. It is thus proposed to explore the relationship between income inequality, social inequality and disparities in health status in the context of the emergence of social inequalities in health (SSI). According to the definitions of social determinants, health inequality must be considered from a perspective of systematic analysis referring to the most explicitly cited and proven socio-economic theories in the health economics literature. A conceptual framework on methods for measuring social inequalities in health was proposed to discuss approaches to decomposing inequalities in health care consumption, in particular with the concentration index as a measure that has so far been little explored. This made it possible to assess health inequalities, make a judgment on the inequity of health care distribution, and highlight the relevance of this measure in this area.Among the aspects of health inequality, several determinants support disparities in the demand for health services that are linked to both economic situations and health systems. Many theoretical approaches argue that inequality in access to care is linked to the characteristics and norms of health systems that lead to conditions of inequity in financial access to care and the use of the resources and services of these systems. This has been a motivation for successive and ongoing reforms in several countries around the world in the areas of health financing and health insurance. These reforms have also sought to improve the performance of health systems. Thus, in this thesis, we have tried to measure the levels of efficiency and equity in the Tunisian health system, by studying the factors that cause health inequalities in Tunisia and the reform of health insurance as well as the determinants of its development as a means of financing health care. We then presented an evaluation of the reform of the Caisse Nationale d'Assurance Maladie (CNAM) in 2007, examined its impact on access to healthcare and analysed their motivations and consequences. A conceptual framework for health system performance evaluation is presented to discuss methods for measuring and estimating the level of technical and economic efficiency, including the DEA method
Bachmann, Sascha. "Concentration Inequalities for Poisson Functionals." Doctoral thesis, 2016. https://repositorium.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-2016011313874.
Full textLucas, Leonard Joseph. "Uncertainty Quantification Using Concentration-of-Measure Inequalities." Thesis, 2009. https://thesis.library.caltech.edu/2282/1/LeonardJosephLucasThesis.pdf.
Full textStrzelecki, Michał. "Functional and transport inequalities and their applications to concentration of measure." Doctoral thesis, 2019. https://depotuw.ceon.pl/handle/item/3539.
Full textThis thesis is devoted to the study of functional and transportation inequalities connected to the concentration of measure phenomenon. In the first part, we work in the classical setting of smooth functions and are interested in the concentration between the exponential and Gaussian levels. We prove that a probability measure which satisfies a Beckner-type inequality of Latała and Oleszkiewicz, also satisfies a modified log-Sobolev inequality. As a corollary, we obtain improved (dimension-free) two-level concentration for products of such measures. The second, more extensive, part is concerned with concentration of measure for convex functions. Our main tool, used throughout, is the theory of weak transportation inequalities introduced recently by Gozlan, Roberto, Samson, and Tetali. We start by presenting a characterization of probability measures on the real line which satisfy the convex log-Sobolev inequality. This allows us to give concentration estimates of the lower and upper tails of convex Lipschitz functions (the latter were not known before). We then prove that a probability measure on $\mathbb{R}^n$ which satisfies the convex Poincar\'e inequality also satisfies a Bobkov--Ledoux modified log-Sobolev inequality, extending results obtained by other authors for measures on $\mathbb{R}$. We also present refined concentration of measure inequalities, which are consequences of weak transportation inequalities (or, equivalently, their dual formulations: convex infimum convolution inequalities). This includes applications to concentration for non-Lipschitz convex functions. Our last result concerns convex infimum convolution inequalities with optimal cost functions for measures with log-concave tails. As a corollary, we obtain comparison of weak and strong moments of random vectors with independent coordinates with log-concave tails.
Chen, Yuhua Richard. "Concentration Inequalities of Random Matrices and Solving Ptychography with a Convex Relaxation." Thesis, 2017. https://thesis.library.caltech.edu/9911/1/richard_yuhua_chen_2017_thesis.pdf.
Full textRandom matrix theory has seen rapid development in recent years. In particular, researchers have developed many non-asymptotic matrix concentration inequalities that parallel powerful scalar concentration inequalities. In this thesis, we focus on three topics: 1) estimating sparse covariance matrix using matrix concentration inequalities, 2) constructing the matrix phi-entropy to derive matrix concentration inequalities, 3) developing scalable algorithms to solve the phase recovery problem of ptychography based on low-rank matrix factorization.
Estimation of covariance matrix is an important subject. In the setting of high dimensional statistics, the number of samples can be small in comparison to the dimension of the problem, thus estimating the complete covariance matrix is unfeasible. By assuming that the covariance matrix satisfies some sparsity assumptions, prior work has proved that it is feasible to estimate the sparse covariance matrix of Gaussian distribution using the masked sample covariance estimator. In this thesis, we use a new approach and apply non-asymptotic matrix concentration inequalities to obtain tight sample bounds for estimating the sparse covariance matrix of subgaussian distributions.
The entropy method is a powerful approach in developing scalar concentration inequalities. The key ingredient is the subadditivity property that scalar entropy function exhibits. In this thesis, we construct a new concept of matrix phi-entropy and prove that matrix phi-entropy also satisfies a subadditivity property similar to the scalar form. We apply this new concept of matrix phi-entropy to derive non-asymptotic matrix concentration inequalities.
Ptychography is a computational imaging technique which transforms low-resolution intensity-only images into a high-resolution complex recovery of the signal. Conventional algorithms are based on alternating projection, which lacks theoretical guarantees for their performance. In this thesis, we construct two new algorithms. The first algorithm relies on a convex formulation of the ptychography problem and on low-rank matrix recovery. This algorithm improves traditional approaches' performance but has high computational cost. The second algorithm achieves near-linear runtime and memory complexity by factorizing the objective matrix into its low-rank components and approximates the first algorithm's imaging quality.
Root, Jonathan. "Concentration of measure, negative association, and machine learning." Thesis, 2016. https://hdl.handle.net/2144/19741.
Full textFerreira, Flávio Rúben de Sousa. "Sobre o conceito e medição da desigualdade comercial." Master's thesis, 2011. http://hdl.handle.net/10071/4386.
Full textWith the beginning of the 1970s, the world trade volume in goods and services is subject to an exponential growth. To this acceleration is assigned, in general terms, a possible decrease in the spatial concentration of economic activity. However, strong spatial irregularities on the population distribution, on wealth and particularly on commercial activity continue to persist. It is in this context of world trade unequal distribution that the present investigation arises. In order to determine the causes of these disparities, it is proposed a summary of the theoretical contributions that characterizes the international trade and an analysis and quantification of factors that explain such occurrences. The developed empirical analysis in conjunction with the theoretical context brings us some answers. In short, the different characteristics of industrial structure, geography, factor endowments, level of trade integration, level of infrastructure and technological level between countries takes a very strong and positive relationship with the trade distribution. In general, large differences in these characteristics, registered for different countries, are related with higher inequalities in trade.
Philips, Petra. "Data-Dependent Analysis of Learning Algorithms." Phd thesis, 2005. http://hdl.handle.net/1885/47998.
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