Дисертації з теми "Modèle de covariance"
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Perrin, Olivier. "Modèle de covariance d'un processus non-stationnaire par déformation de l'espace et statistique." Paris 1, 1997. http://www.theses.fr/1997PA010099.
Valeyre, Sébastien. "Modélisation fine de la matrice de covariance/corrélation des actions." Thesis, Sorbonne Paris Cité, 2019. https://tel.archives-ouvertes.fr/tel-03180258.
A new methodology has been introduced to clean the correlation matrix of single stocks returns based on a constrained principal component analysis using financial data. Portfolios were introduced, namely "Fundamental Maximum Variance Portfolios", to capture in an optimal way the risks defined by financial criteria ("Book", "Capitalization", etc.). The constrained eigenvectors of the correlation matrix, which are the linear combination of these portfolios, are then analyzed. Thanks to this methodology, several stylized patterns of the matrix were identified: i) the increase of the first eigenvalue with a time scale from 1 minute to several months seems to follow the same law for all the significant eigenvalues with 2 regimes; ii) a universal law seems to govern the weights of all the "Maximum variance" portfolios, so according to that law, the optimal weights should be proportional to the ranking based on the financial studied criteria; iii) the volatility of the volatility of the "Maximum Variance" portfolios, which are not orthogonal, could be enough to explain a large part of the diffusion of the correlation matrix; iv) the leverage effect (increase of the first eigenvalue with the decline of the stock market) occurs only for the first mode and cannot be generalized for other factors of risk. The leverage effect on the beta, which is the sensitivity of stocks with the market mode, makes variable theweights of the first eigenvector
Muñiz, Alvarez Lilian. "Estimation nonparamétrique de la structure de covariance des processus stochastiques." Toulouse 3, 2010. http://thesesups.ups-tlse.fr/1089/.
The main objective of this thesis is the development of nonparametric methods for estimating the covariance of a stochastic process. Assuming different conditions on the process, estimators of the covariance function are introduced, having the property of being non-negative definite functions. In addition, a method for estimating the covariance matrix of a stochastic process in a high dimensional setting is proposed. Our work is organized as follows: in Chapter 1 we give a general introduction, where we present briefly the concepts and definitions underlying our work. Then come three chapters, detailing the proposed new estimation methods. More precisely, in each chapter we have developed different nonparametric estimation techniques: function approximation by wavelet thresholding in Chapter 2, model selection in Chapter 3, and estimation by Group-Lasso penalization in Chapter 4. The theoretical behavior of the estimators is studied in all cases and its good practical performances are shown in some numerical examples
Spinnato, Juliette. "Modèles de covariance pour l'analyse et la classification de signaux électroencéphalogrammes." Thesis, Aix-Marseille, 2015. http://www.theses.fr/2015AIXM4727/document.
The present thesis finds itself within the framework of analyzing and classifying electroencephalogram signals (EEG) using discriminant analysis. Those multi-sensor signals which are, by nature, highly correlated spatially and temporally are considered, in this work, in the timefrequency domain. In particular, we focus on low-frequency evoked-related potential-type signals (ERPs) that are well described in the wavelet domain. Thereafter, we will consider signals represented by multi-scale coefficients and that have a matrix structure electrodes × coefficients. Moreover, EEG signals are seen as a mixture between the signal of interest that we want to extract and spontaneous activity (also called "background noise") which is overriding. The main problematic is here to distinguish signals from different experimental conditions (class). In the binary case, we focus on the probabilistic approach of the discriminant analysis and Gaussian mixtures are used, describing in each class the signals in terms of fixed (mean) and random components. The latter, characterized by its covariance matrix, allow to model different variability sources. The estimation of this matrix (and of its inverse) is essential for the implementation of the discriminant analysis and can be deteriorated by high-dimensional data and/or by small learning samples, which is the application framework of this thesis. We are interested in alternatives that are based on specific covariance model(s) and that allow to decrease the number of parameters to estimate
Ricci, Sophie. "Assimilation variationnelle océanique : modélisation multivariée de la matrice de covariance d'erreur d'ébauche." Toulouse 3, 2004. http://www.theses.fr/2004TOU30048.
Lai, Chantal. "Les déterminants de la performance sur le marché des extensions de marque : modèle explicatif et validation empirique sur des produits de grande consommation." Paris 1, 2000. http://www.theses.fr/2000PA010003.
Passemier, Damien. "Inférence statistique dans un modèle à variances isolées de grande dimension." Phd thesis, Université Rennes 1, 2012. http://tel.archives-ouvertes.fr/tel-00780492.
Bachoc, François. "Estimation paramétrique de la fonction de covariance dans le modèle de Krigeage par processus Gaussiens : application à la quantification des incertitudes en simulation numérique." Phd thesis, Université Paris-Diderot - Paris VII, 2013. http://tel.archives-ouvertes.fr/tel-00881002.
Bouayed, Mohamed Amine. "Modélisation stochastique par éléments finis en géomécanique." Vandoeuvre-les-Nancy, INPL, 1997. http://www.theses.fr/1997INPL087N.
Geraets, David. "Modélisation stochastique de champs de vitesse géophysique en exploration pétrolière." Phd thesis, École Nationale Supérieure des Mines de Paris, 2002. http://pastel.archives-ouvertes.fr/pastel-00001236.
Benhmida, Saïd. "Robustesse et comportement asymptotique d'un TRA-estimateur des coefficients d'un processus ARMA (p,q)." Nancy 1, 1995. http://www.theses.fr/1995NAN10035.
Zitouna-Chebbi, Rim. "Observations et caractérisation des échanges d'eau et d'énergie dans le continuum sol-plante-atmosphère en condition de relief collinaire : cas du bassin versant Kamech, Cap Bon, Tunisie." Montpellier SupAgro, 2009. http://www.theses.fr/2009NSAM0027.
Allez, Romain. "Chaos multiplicatif Gaussien, matrices aléatoires et applications." Phd thesis, Université Paris Dauphine - Paris IX, 2012. http://tel.archives-ouvertes.fr/tel-00780270.
Brender, Pierre. "Modélisation des flux de carbone, d'énergie et d'eau entre l'atmosphère et des écosystèmes de steppe sahélienne avec un modèle de végétation global." Phd thesis, AgroParisTech, 2012. http://pastel.archives-ouvertes.fr/pastel-00826115.
Ducasse, Quentin. "Etude de la méthode de substitution à partir de la mesure simultanée des probabilités de fission et d'émission gamma des actinides 236U, 238U, 237Np et 238Np." Thesis, Bordeaux, 2015. http://www.theses.fr/2015BORD0109/document.
Neutron-induced cross sections of short-lived nuclei are important in various fields such as fundamental physics, astrophysics or nuclear energy. However, these cross sections are often extremely difficult to measure due to high radioactivity of the targets involved. The surrogate-reaction method is an indirect way to determine neutron-induced cross sections of short-lived nuclei. In order to study the validity of the method, we have measured for the very first time in a surrogate-reaction experiment simultaneously fission and gamma-decay probabilities for the actinides 236U, 238U, 237Np and 238Np. This is challenging because one has to remove the gamma rays emitted by the fission fragments. The measurement was performed at the Oslocyclotron.Our results show that for a given excitation energy, our gamma-decay probabilities are several times higher than neutron-induced probabilities, which can be attributed to differences in spin distribution between the two types of reactions. On the other hand, our fission probabilities are in good agreement with neutron-induced data. Statistical-model calculations applied with standardparameters cannot reproduce the weak spin sensibility to variations of the angular momentum observed for the fission probabilities. However, it is possible to reproduce the experimental observations by considering a stronger increase of the moment of inertia of the fissionning nucleus with deformation. Further theoretical efforts are needed to improve the understanding of our results
Shtuka, Arben. "Simulation, traitement et visualisation des images numériques : apport du codage par indicatrice en géostatistique." Vandoeuvre-les-Nancy, INPL, 1994. http://www.theses.fr/1994INPL139N.
Dellagi, Hatem. "Estimations paramétrique et non paramétrique des données manquantes : application à l'agro-climatologie." Paris 6, 1994. http://www.theses.fr/1994PA066546.
Wegelin, Jacob A. "Latent models for cross-covariance /." Thesis, Connect to this title online; UW restricted, 2001. http://hdl.handle.net/1773/8982.
Kessedjian, Grégoire. "Mesures de sections efficaces d'actinides mineurs d'intérêts pour la transmutation." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2008. http://tel.archives-ouvertes.fr/tel-00404445.
Fevrier, Maxime. "Liberté infinitésimale et modèles matriciels déformés." Phd thesis, Université Paul Sabatier - Toulouse III, 2010. http://tel.archives-ouvertes.fr/tel-00567800.
Février, Maxime. "Liberté infinitésimale et modèles matriciels déformés." Toulouse 3, 2010. http://thesesups.ups-tlse.fr/1252/.
This thesis is about Random Matrix Theory and Free Probability whose strong relation is known since the early nineties. The results mainly organize in two parts : one on infinitesimal freeness, the other on deformed matrix models. More precisely, a combinatorial theory of first order infinitesimal freeness, as introduced by Belinschi and Shlyakhtenko, is developed and generalized to higher order. We give a simple and general framework and we introduce infinitesimal non-crossing cumulant functionals, providing a characterization of infinitesimal freeness. The emphasis is put on combinatorics and on the essentially differential ideas underlying this notion. The second part carries further the study of deformations of matrix models, which has been a very active field of research these past years. The results we present are original in the sense they deal with non-necessarily finite rank deterministic Hermitian perturbations of Wigner and Wishart matrices. Moreover, these results shed light on the link between convergence of eigenvalues of deformed matrix models and free probability, particularly the subordination phenomenon related to free convolution. This link gives an illustration of the power of free probability ideas in random matrix problems
Porteous, B. T. "Properties of log linear and covariance selection models." Thesis, University of Cambridge, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372900.
Wong, Kevin Kin Foon. "An efficient sampler for decomposable covariance selection models /." View Abstract or Full-Text, 2002. http://library.ust.hk/cgi/db/thesis.pl?ISMT%202002%20WONG.
Includes bibliographical references (leaves 35-36). Also available in electronic version. Access restricted to campus users.
Orchard, Peter Raymond. "Sparse inverse covariance estimation in Gaussian graphical models." Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/9955.
Kim, Myung Geun. "Models for the covariance matrices of several groups /." The Ohio State University, 1991. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487758680162533.
Marin, Jean-Michel. "Statistiques des modèles à structure de covariance bande-diagonale linéaire." Toulouse 3, 2001. http://www.theses.fr/2001TOU30123.
Kessedjian, Grégoire. "Mesures de sections efficaces d'actinides mineurs d'intérêt pour la transmutation." Thesis, Bordeaux 1, 2008. http://www.theses.fr/2008BOR13672/document.
The existing reactors produce two kinds of nuclear waste : the fission products and heavy nuclei beyond uranium called minor actinides (Americium and Curium isotopes). Two options are considered: storage in deep geological site and/or transmutation by fast neutron induced fission. These studies involve many neutron data. Unfortunately, these data bases have still many shortcomings to achieve reliable results. The aim of these measurements is to update nuclear data and complement them. We have measured the fission cross section of 243Am (7370y) in reference to the (n,p) elastic scattering to provide new data in a range of fast neutrons (1 - 8 MeV). A statistical model has been developed to describe the reaction 243Am(n,f). Moreover, the cross sections from the following reactions have been be extracted from these calculations: inelastic scattering 243Am(n,n’) and radiative capture 243Am(n,?) cross sections. The direct measurements of neutron cross sections are often a challenge considering the short half-lives of minor actinides. To overcome this problem, a surrogate method using transfer reactions has been used to study few isotopes of curium. The reactions 243Am(3He, d)244cm, 243Am(3He, t)243cm and 243Am(3He, alpha)242Am allowed to measure the fission probabilities of 243,244Cm and 242Am. The fission cross sections of 242,243Cm(162,9d, 28,5y) and 241Am(431y) have been obtained by multiplying these fission probabilities by the calculated compound nuclear neutron cross section relative to each channel. For each measurement, an accurate assessment of the errors was realized through variance-covariance studies. For measurements of the reaction 243Am(n,f), the analysis of error correlations allowed to interpret the scope of these measures within the existing measurements
Raynaud, Laure. "Application, validation et réglage d'une assimilation d'ensemble." Toulouse 3, 2010. http://thesesups.ups-tlse.fr/4310/.
A precise specification of background-error variances and covariances is essential to the success of the data assimilation process. Recent works suggest to estimate these statistics within an ensemble of perturbed assimilations. This approach, derived from Monte Carlo methods, offers the possibility to estimate flow-dependent statistics, and to get free of hypotheses and constraints related to estimation and modeling methods used so far. A major difficulty of this approach, induced by the finite ensemble size, is the relatively high level of sampling noise that affects the estimated statistics. Some filtering tools must then be developed, in order to reduce the noise and to improve the estimates accuracy. First investigations aim to design, from both theoretical and technical points of view, an objective spatial filtering of the ensemble-based error variances, which relies on a calculation of the noise/signal ratio of the estimation. The application of this filtering to the Arpège model ensemble variational assimilation shows its ability to extract from the noisy estimates a rich and robust information, closely linked to occurring dynamic and physical processes. The impact of extending the use of ensemble variances "of the day" to all variables in the assimilation system of the Arpège model is then examined. It turns out to be globally neutral to positive in terms of space and time-averaged forecast scores. On the other hand, significant improvements are obtained for the prediction of severe weather events. Finally, the representation of model error within the ensemble assimilation is considered. A posteriori diagnostics are used to objectively estimate an inflation coefficient, which is then applied to background perturbations in order to simulate the effects of model error
Nzabanita, Joseph. "Bilinear and Trilinear Regression Models with Structured Covariance Matrices." Doctoral thesis, Linköpings universitet, Matematisk statistik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-118089.
Frühwirth-Schnatter, Sylvia, and Regina Tüchler. "Bayesian parsimonious covariance estimation for hierarchical linear mixed models." Institut für Statistik und Mathematik, WU Vienna University of Economics and Business, 2004. http://epub.wu.ac.at/774/1/document.pdf.
Series: Research Report Series / Department of Statistics and Mathematics
Mook, Daniel Joseph. "Measurement covariance-constrained estimation for poorly modeled dynamic systems." Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/49776.
Kalaitzis, Alfredo. "Learning with structured covariance matrices in linear Gaussian models." Thesis, University of Sheffield, 2013. http://etheses.whiterose.ac.uk/4038/.
Jensen, Tracy. "Modelling conditional covariances with orthogonal factor models." Master's thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/10951.
Lardin, Pauline. "Estimation de synchrones de consommation électrique par sondage et prise en compte d'information auxiliaire." Phd thesis, Université de Bourgogne, 2012. http://tel.archives-ouvertes.fr/tel-00842199.
Lynch, Andrew Graeme. "Covariate models for size distributions." Thesis, University of Sheffield, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.251220.
Wu, Yue. "Bayesian dynamic covariance models with applications to finance and econometrics." Thesis, University of Cambridge, 2014. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708037.
Nzabanita, Joseph. "Estimation in Multivariate Linear Models with Linearly Structured Covariance Matrices." Licentiate thesis, Linköpings universitet, Matematiska institutionen, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-78845.
Papasouliotis, Orestis. "Statistical methods for the analysis of covariance and spatio-temporal models." Thesis, University of Edinburgh, 2000. http://hdl.handle.net/1842/12757.
Sáenz, Egúsquiza Miguel Angel. "Extensión al modelo DINA reparametrizado con covariable." Master's thesis, Pontificia Universidad Católica del Perú, 2020. http://hdl.handle.net/20.500.12404/17324.
Tesis
Liang, Yuli. "Contributions to Estimation and Testing Block Covariance Structures in Multivariate Normal Models." Doctoral thesis, Stockholms universitet, Statistiska institutionen, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-115347.
BRITO, DIEGO SIEBRA DE. "FORECASTING LARGE REALIZED COVARIANCE MATRICES: THE BENEFITS OF FACTOR MODELS AND SHRINKAGE." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2018. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=35140@1.
Este trabalho propõe um modelo de previsão de matrizes de covariância realizada de altíssima dimensão, com aplicação para os componentes do índice S e P 500. Para lidar com o altíssimo número de parâmetros (maldição da dimensionalidade), propõe-se a decomposição da matriz de covariância de retornos por meio do uso de um modelo de fatores padrão (e.g. tamanho, valor, investimento) e uso de restrições setoriais na matriz de covariância residual. O modelo restrito é estimado usando uma especificação de vetores auto regressivos heterogêneos (VHAR) estimados com LASSO (Least Absolute Shrinkage and Selection Operator). O uso da metodologia proposta melhora a precisão de previsão em relação a benchmarks padrões e leva a melhores estimativas de portfólios de menor variância.
We propose a model to forecast very large realized covariance matrices of returns, applying it to the constituents of the S and P 500 on a daily basis. To deal with the curse of dimensionality, we decompose the return covariance matrix using standard firm-level factors (e.g. size, value, profitability) and use sectoral restrictions in the residual covariance matrix. This restricted model is then estimated using Vector Heterogeneous Autoregressive (VHAR) models estimated with the Least Absolute Shrinkage and Selection Operator (LASSO). Our methodology improves forecasting precision relative to standard benchmarks and leads to better estimates of the minimum variance portfolios.
Li, Fan. "Estimating and distinguishing between moderator and quadratic models in covariance structure modeling /." The Ohio State University, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487778663287862.
Briglia, Johan. "De l'énactivisme appliqué à la mémoire humaine : Athena, un modèle fractal de covariances sensorimotrices." Thesis, Montpellier 3, 2017. http://www.theses.fr/2017MON30076/document.
Since the cognitive revolution of the 1950s, the cognitive paradigm has been accepted by the great majority of researchers, especially in the domain of memory. Connectionism has come to question its modular organization by emphasizing its emergent character. However, the question of reference remained posed in the sense it was based on the existence of internal representations of a world external to the subject. The enactivist paradigm, that takes up the principles of constructivism, proposes that cognition should no longer be seen as the representation of a pre-existing world but as the product of our sensorimotor experiences. In this work, we present ATHENA: an enactivist model of memory without representations inspired by MINERVA2, but taking into account the contributions of the Act-In model. Memory is built by a fractal contextualization of sensorimotor covariances. A series of experimental simulations allows us to account for many memory phenomena in a more effective way than what is possible within representationalism: the emergence, learning and manipulation of abstractions without representations; but also other cognitive phenomena such as a subjective time construction (without temporal representations learned)
Langohr, Klaus. "Regression models with an interval-censored covariate." Doctoral thesis, Universitat Politècnica de Catalunya, 2004. http://hdl.handle.net/10803/6508.
La primera parte del Capítulo 1 contiene un resumen de la metodología estadística para datos censurados en un intervalo, incluyendo tanto métodos paramétricos como no-paramétricos. En la Sección 1.2 abordamos el tema de censura noinformativa que se supone cumplida para todos los métodos presentados. Dada la importancia de métodos de optimización en los demás capítulos, la Sección 1.3 trata de la teoría de optimización. Esto incluye varios algoritmos de optimización y la presentación de herramientas de optimización. Se ha utilizado el lenguaje de programación matemática AMPL para resolver los problemas de maximización que han surgido. Una de las características más importantes de AMPL es la posibilidad de enviar problemas de optimización al servidor 'NEOS: Server for Optimization' en Internet para que sean solucionados por ese servidor.
En el Capítulo 2, se presentan los conjuntos de datos que han sido analizados. El primer estudio es sobre la supervivencia de pacientes de tuberculosis co-infectados por el VIH en Barcelona, mientras el siguiente, también del área de VIH/SIDA, trata de usuarios de drogas intra-venosas de Badalona y alrededores que fueron admitidos a la unidad de desintoxicación del Hospital Trias i Pujol. Un área completamente diferente son los estudios sobre la vida útil de alimentos. Se presenta la aplicación de la metodología para datos censurados en un intervalo en esta área.
El Capítulo 3 trata del marco teórico de un modelo de vida acelerada con una covariante censurada en un intervalo. Puntos importantes a tratar son el desarrollo de la función de verosimilitud y el procedimiento de estimación de parámetros con métodos del área de optimización. Su uso puede ser una herramienta importante en la estadística. Estos métodos se aplican también a otros modelos con una covariante censurada en un intervalo como se demuestra en el Capítulo 4.
Otros métodos que se podrían aplicar son descritos en el Capítulo 5. Se trata sobre todo de métodos basados en técnicas de imputación para datos censurados en un intervalo. Consisten en dos pasos: primero, se imputa el valor desconocido de la covariante, después, se pueden estimar los parámetros con procedimientos estadísticos estándares disponibles en cualquier paquete de software estadístico.
El método de maximización simultánea ha sido implementado por el autor con el código de AMPL y ha sido aplicado al conjunto de datos de Badalona. Presentamos los resultados de diferentes modelos y sus respectivas interpretaciones en el Capítulo 6.
Se ha llevado a cabo un estudio de simulación cuyos resultados se dan en el Capítulo 7. Ha sido el objetivo comparar la maximización simultánea con dos procedimientos basados en la imputación para el modelo de vida acelerada. Finalmente, en el último capítulo se resumen los resultados y se abordan diferentes aspectos que aún permanecen sin ser resueltos o podrían ser aproximados de manera diferente.
Survival analysis deals with the evaluation of variables which measure the elapsed time until an event of interest. One particularity survival analysis has to account for are censored data, which arise whenever the time of interest cannot be measured exactly, but partial information is available. Four types of censoring are distinguished: right-censoring occurs when the unobserved survival time is bigger, left-censoring when it is less than an observed time, and in case of interval-censoring, the survival time is observed within a time interval. We speak of doubly-censored data if also the time origin is censored.
In Chapter 1 of the thesis, we first give a survey on statistical methods for interval-censored data, including both parametric and nonparametric approaches. In the second part of Chapter 1, we address the important issue of noninformative censoring, which is assumed in all the methods presented. Given the importance of optimization procedures in the further chapters of the thesis, the final section of Chapter 1 is about optimization theory. This includes some optimization algorithms, as well as the presentation of optimization tools, which have played an important role in the elaboration of this work. We have used the mathematical programming language AMPL to solve the maximization problems arisen. One of its main features is that optimization problems written in the AMPL code can be sent to the internet facility 'NEOS: Server for Optimization' and be solved by its available solvers.
In Chapter 2, we present the three data sets analyzed for the elaboration of this dissertation. Two correspond to studies on HIV/AIDS: one is on the survival of Tuberculosis patients co-infected with HIV in Barcelona, the other on injecting drug users from Badalona and surroundings, most of whom became infected with HIV as a result of their drug addiction. The complex censoring patterns in the variables of interest of the latter study have motivated the development of estimation procedures for regression models with interval-censored covariates. The third data set comes from a study on the shelf life of yogurt. We present a new approach to estimate the shelf lives of food products taking advantage of the existing methodology for interval-censored data.
Chapter 3 deals with the theoretical background of an accelerated failure time model with an interval-censored covariate, putting emphasize on the development of the likelihood functions and the estimation procedure by means of optimization techniques and tools. Their use in statistics can be an attractive alternative to established methods such as the EM algorithm. In Chapter 4 we present further regression models such as linear and logistic regression with the same type of covariate, for the parameter estimation of which the same techniques are applied as in Chapter 3.
Other possible estimation procedures are described in Chapter 5. These comprise mainly imputation methods, which consist of two steps: first, the observed intervals of the covariate are replaced by an imputed value, for example, the interval midpoint, then, standard procedures are applied to estimate the parameters.
The application of the proposed estimation procedure for the accelerated failure time model with an interval-censored covariate to the data set on injecting drug users is addressed in Chapter 6. Different distributions and covariates are considered and the corresponding results are presented and discussed.
To compare the estimation procedure with the imputation based methods of Chapter 5, a simulation study is carried out, whose design and results are the contents of Chapter 7. Finally, in the closing Chapter 8, the main results are summarized and several aspects which remain unsolved or might be approximated in another way are addressed.
Damian, Doris. "A Bayesian approach to estimating heterogeneous spatial covariances /." Thesis, Connect to this title online; UW restricted, 2002. http://hdl.handle.net/1773/9563.
Poomimars, Ponladesh. "The performance of dynamic covariance models in portfolio allocation, hedging and risk management." Thesis, University of Birmingham, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.395728.
Chong, James Tzeh-min. "The forecasting abilities of implied and econometric variance-covariance models across financial measures." Thesis, University of Reading, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.395179.
Simpson, Sean L. Edwards Lloyd J. "Linear models with a generalized AR1 covariance structure for longitudinal and spatial data." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2008. http://dc.lib.unc.edu/u?/etd,1969.
Title from electronic title page (viewed Dec. 11, 2008). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Biostatistics, School of Public Health." Discipline: Biostatistics; Department/School: Public Health.
Ribbing, Jakob. "Covariate Model Building in Nonlinear Mixed Effects Models." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-7923.
Marot-Briend, Guillemette. "Modélisation statistique pour la recherche de gènes différentiellement exprimés : modèles de variance-covariance, analyse séquentielle et méta-analyse." Paris, AgroParisTech, 2009. http://pastel.paristech.org/5473/01/phDreportGMarot.pdf.