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Dissertations / Theses on the topic 'Estimation de Kaplan-Meier'

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Published: 4 June 2021

Last updated: 17 February 2022

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1

Takam, Soh Patrice. "Estimation de la loi de la durée de séjour en présence d'une censure post-évènement d'intérêt. : Application à la croissance des fruits du cacaoyer et modélisation du risque d'attaque par la pourriture brune au Cameroun." Thesis, Montpellier 2, 2011. http://www.theses.fr/2011MON20163/document.

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Nous nous sommes intéressés dans cette étude à l'estimation de la loi de la durée de séjour en prenant en compte les individus sur lesquels l'évènement d'intérêt et la censure peuvent se produire dans un même intervalle et être observés. Pour cela, nous avons proposé deux approches d'estimation non paramétrique basées sur une approximation asymptotique quand la longueur de l'intervalle entre deux dates consécutives d'observation tend vers 0. La première est basée sur une relation intégrale et la deuxième est basée sur une restauration des durées de séjour. Nous nous sommes servis de ces approc

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2

Jiang, Yong. "Estimation of Hazard Function for Right Truncated Data." Digital Archive @ GSU, 2011. http://digitalarchive.gsu.edu/math_theses/94.

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This thesis centers on nonparametric inferences of the cumulative hazard function of a right truncated variable. We present three variance estimators for the Nelson-Aalen estimator of the cumulative hazard function and conduct a simulation study to investigate their performances. A close match between the sampling standard deviation and the estimated standard error is observed when an estimated survival probability is not close to 1. However, the problem of poor tail performance exists due to the limitation of the proposed variance estimators. We further analyze an AIDS blood transfusion sampl

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3

Svoboda, Martin. "Neparametrické odhady rozdělení doby přežití." Master's thesis, Vysoká škola ekonomická v Praze, 2009. http://www.nusl.cz/ntk/nusl-10935.

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This work introduces nonparametric models which are used in time to event data analysis. It is focused on applying these methods in medicine where it is called survival analysis. The basic techniques and problems, which can appear in survival analysis, are presented and explained here. The Kaplan -- Meier estimator of survival function is discussed in the main part. This is the most frequented method used for estimating the survival function in patients who have undergone a specific treatment. The Kaplan -- Meier estimator is also a common device in the statistical packets. In addition to esti

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4

Ferrani, Yacine. "Sur l'estimation non paramétrique de la densité et du mode dans les modèles de données incomplètes et associées." Thesis, Littoral, 2014. http://www.theses.fr/2014DUNK0370/document.

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Cette thèse porte sur l'étude des propriétés asymptotiques d'un estimateur non paramétrique de la densité de type Parzen-Rosenblatt, sous un modèle de données censurées à droite, vérifiant une structure de dépendance de type associé. Dans ce cadre, nous rappelons d'abord les résultats existants, avec détails, dans les cas i.i.d. et fortement mélangeant (α-mélange). Sous des conditions de régularité classiques, il est établi que la vitesse de coonvergence uniforme presque sûre de l'estimateur étudié, est optimale. Dans la partie dédiée aux résultats de cette thèse, deux résultats principaux et

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5

Grosclaude, Pascale. "Mesure de la survie des patients cancéreux en population à partir des registres de cancers : intérêts et limites." Paris 11, 2000. http://www.theses.fr/2000PA11T051.

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Les registres de population doivent donner des indications fiables et non biaisées sur les besoins de prise en charge et sur les performances du système de soins. L'étude de la survie occupe une position centrale dans la construction des indicateurs de santé. Les analyses de survie en population diffèrent de celles issues des essais thérapeutiques par les méthodes d'analyse et par des biais spécifiques qui sont étudiés dans ce travail et illustrés d'exemples. La survie relative est la méthode la plus utilisée. Dans les comparaisons, une attention particulière doit donc être portée à la mortali

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6

Horrigue, Walid. "Prévision non paramétrique dans les modèles de censure via l'estimation du quantile conditionnel en dimension infinie." Thesis, Littoral, 2012. http://www.theses.fr/2012DUNK0511.

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Dans cette thèse, nous étudions les propriétés asymptotiques de paramètres fonctionnels conditionnels en statistique non paramétrique, quand la variable explicative prend ses valeurs dans un espace de dimension infinie. Dans ce cadre non paramétrique, on considère les estimateurs des paramètres fonctionnels usuels, tels la loi conditionnelle, la densité de probabilité conditionnelle, ainsi que le quantile conditionnel. Le premier travail consiste à proposer un estimateur du quantile conditionnel et de prouver sa convergence uniforme sur un sous-ensemble compact. Afin de suivre la convention da

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7

Gassama, Malamine. "Estimation du risque attribuable et de la fraction préventive dans les études de cohorte." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLV131/document.

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Le risque attribuable (RA) mesure la proportion de cas de maladie qui peuvent être attribués à une exposition au niveau de la population. Plusieurs définitions et méthodes d'estimation du RA ont été proposées pour des données de survie. En utilisant des simulations, nous comparons quatre méthodes d'estimation du RA dans le contexte de l'analyse de survie : deux méthodes non paramétriques basées sur l'estimateur de Kaplan-Meier, une méthode semi-paramétrique basée sur le modèle de Cox à risques proportionnels et une méthode paramétrique basée sur un modèle à risques proportionnels avec un risqu

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8

Detais, Amélie. "Maximum de vraisemblance et moindre carrés pénalisés dans des modèles de durée de vie censurées." Toulouse 3, 2008. http://thesesups.ups-tlse.fr/820/.

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L'analyse de durées de vie censurées est utilisée dans des domaines d'application variés et différentes possibilités ont été proposées pour la modélisation de telles données. Nous nous intéressons dans cette thèse à deux types de modélisation différents, le modèle de Cox stratifié avec indicateurs de strates aléatoirement manquants et le modèle de régression linéaire censuré à droite. Nous proposons des méthodes d'estimation des paramètres et établissons les propriétés asymptotiques des estimateurs obtenus dans chacun de ces modèles. Dans un premier temps, nous considérons une généralisation d

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9

Mota, Rosa Maria Salani. "Respondent driven sampling (RDS) aplicado à população de homens que fazem sexo com homens no Brasil." reponame:Repositório Institucional da UFC, 2012. http://www.repositorio.ufc.br/handle/riufc/7116.

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MOTA, Rosa Maria Salani. Respondent Driven Sampling (RDS) aplicado à população de homens que fazem sexo com homens no Brasil. 2012. 189 f. Tese (Doutorado em Saúde Pública) - Universidade Federal do Ceará. Faculdade de Medicina, Fortaleza, 2012.<br>Submitted by denise santos (denise.santos@ufc.br) on 2014-01-13T11:52:45Z No. of bitstreams: 1 2012_tese_rmsmota.pdf: 6131750 bytes, checksum: cb9fb63c55db61f8c6b8276aaa755008 (MD5)<br>Approved for entry into archive by denise santos(denise.santos@ufc.br) on 2014-01-13T11:53:07Z (GMT) No. of bitstreams: 1 2012_tese_rmsmota.pdf: 6131750 bytes, check

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Fontenelle, OtÃvio Fernandes. "Survival Analysis; Micro and Small Enterprises; Modeling Survival Data, Data Characterization Survival; parametric Estimator KAPLAN-MEIER." Universidade Federal do CearÃ, 2009. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=4173.

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nÃo hÃ<br>The main objective of this research is to explore economics issues that may induce impact on lifetime of small businesses during 2002 to 2006. The group of enterprises studied was selected from database of taxpayers recorded at fiscal authority of State of CearÃ. To do that, the methodology was focused on a branch of statistics which deals with survival analysis, called duration analysis or duration modeling in economics. It was applied non-linear model whose non-parametric estimator chosen was KAPLAN-MEIER. Through that methodology, it was developed sceneries based on the following

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11

Caetano, Sabrina Luzia [UNESP]. "Estudo da idade da vaca ao último parto para avaliar longevidade em rebanhos da raça nelore por análise de sobrevivência." Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/102783.

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Made available in DSpace on 2014-06-11T19:32:15Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-07-05Bitstream added on 2014-06-13T18:43:23Z : No. of bitstreams: 1 caetano_sl_dr_jabo.pdf: 775583 bytes, checksum: a57f6e271b7d34656d680987f933ba7d (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)<br>No Brasil, existem poucos estudos sobre longevidade de vacas de corte, principalmente utilizando ferramentas de análise de sobrevivência na estimação de parâmetros genéticos. Todavia, os critérios para

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12

Higa, Laurinda Yoko Shinzato. "Sobrevivência e fatores de risco para mortalidade identificados ao diagnóstico na coorte de pacientes com fibrose cística do centro de referência do Rio de Janeiro (Brasil)." Instituto Fernandes Figueira, 2011. https://www.arca.fiocruz.br/handle/icict/6435.

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Submitted by Luis Guilherme Macena (guilhermelg2004@gmail.com) on 2013-04-08T16:55:05Z No. of bitstreams: 1 Laurinda Yoko Shinzato Higa_TESE.pdf: 1486069 bytes, checksum: f70375f751ecd6d4742cf70048bbdb2e (MD5)<br>Made available in DSpace on 2013-04-08T16:55:05Z (GMT). No. of bitstreams: 1 Laurinda Yoko Shinzato Higa_TESE.pdf: 1486069 bytes, checksum: f70375f751ecd6d4742cf70048bbdb2e (MD5) Previous issue date: 2011<br>Fundação Oswaldo Cruz. Instituto Fernandes Figueira. Departamento de Ensino. Programa de Pós-Graduação em Saúde da Criança e da Mulher. Rio de Janeiro, RJ, Brasil<br>Introdução:

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13

Rasteiro, Louise Rossi. "Regressão quantílica para dados censurados." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/45/45133/tde-09072017-141021/.

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A regressão quantílica para dados censurados é uma extensão dos modelos de regressão quantílica que, por levar em consideração a informação das observações censuradas na modelagem, e por apresentar propriedades bastante satisfatórias, pode ser vista como uma abordagem complementar às metodologias tradicionais em Análise de Sobrevivência, com a vantagem de permitir que as conclusões inferenciais sejam tomadas facilmente em relação aos tempos de sobrevivência propriamente ditos, e não em relação à taxa de riscos ou a uma função desse tempo. Além disso, em alguns casos, pode ser vista também como

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14

Guedes, Deborah Galv?o Peixoto. "Avalia??o gen?tica da efici?ncia reprodutiva em vacas pardo-su??as por meio da an?lise de sobreviv?ncia." Universidade Federal do Rio Grande do Norte, 2014. http://repositorio.ufrn.br:8080/jspui/handle/123456789/17188.

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Made available in DSpace on 2014-12-17T15:34:49Z (GMT). No. of bitstreams: 1 DeborahGPG_DISSERT.pdf: 1421770 bytes, checksum: da1c0ade32fb8610306243b0cf52f13d (MD5) Previous issue date: 2014-02-20<br>Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior<br>Among the traits of economic importance to dairy cattle livestock those related to sexual precocity and longevity of the herd are essential to the success of the activity, because the stayability time of a cow in a herd is determined by their productive and reproductive lives. In Brazil, there are few studies about the reproductive e

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15

Serasinghe, Shyamalee Kumary. "A simulation comparison of parametric and nonparametric estimators of quantiles from right censored data." Kansas State University, 2010. http://hdl.handle.net/2097/4318.

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Master of Science<br>Department of Statistics<br>Paul I. Nelson<br>Quantiles are useful in describing distributions of component lifetimes. Data, consisting of the lifetimes of sample units, used to estimate quantiles are often censored. Right censoring, the setting investigated here, occurs, for example, when some test units may still be functioning when the experiment is terminated. This study investigated and compared the performance of parametric and nonparametric estimators of quantiles from right censored data generated from Weibull and Lognormal distributions, models which are comm

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16

Menezes, Rosilene de Melo. "Estudo clínico, patológico e detecção do papillomavírus humano no carcinoma de células escamosas de orofaringe tratados por cirurgia." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/5/5155/tde-16022017-144922/.

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Introdução: O câncer de orofaringe representa 10 a 12 % entre todos os tumores malignos do trato aero digestivo superior com incidência crescente nos Estados Unidos e Europa. O Papillomavírus humano (HPV) está associado aos tumores de orofaringe em até 63%, promovendo uma evolução e prognóstico melhor. Objetivo: Descrever a prevalência do HPV em carcinomas de células escamosas de orofaringe tratados por cirurgia. Analisar a associação entre a presença do HPV e as características demográficas, clínicas, patológicas e terapêuticas. Avaliar a importância da presença do HPV na sobrevida livre de d

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17

Sánchez, Vergaray Eduardo. "Factores asociados a la falla virológica en pacientes nuevos con el VIH/SIDA que iniciaron TARGA." reponame:Repositório Institucional da FIOCRUZ, 2014. https://www.arca.fiocruz.br/handle/icict/14194.

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Made available in DSpace on 2016-05-11T12:52:25Z (GMT). No. of bitstreams: 2 173.pdf: 1393850 bytes, checksum: f42a39478517a9d553079202299ea4eb (MD5) license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5) Previous issue date: 2014<br>Introducción: La introducción de la Terapia Antirretroviral de Gran Actividad (TARGA), ha reducido la morbi-mortalidad de los pacientes con VIH/SIDA tratados, yla mejora en su calidad de vida, debido al control de la replicación viral del VIH y a lamejoría del sistema inmune, conllevando a la disminución de las infecciones oportunistas.La TARG

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18

Caetano, Sabrina Luzia. "Estudo da idade da vaca ao último parto para avaliar longevidade em rebanhos da raça nelore por análise de sobrevivência /." Jaboticabal : [s.n.], 2011. http://hdl.handle.net/11449/102783.

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Resumo: No Brasil, existem poucos estudos sobre longevidade de vacas de corte, principalmente utilizando ferramentas de análise de sobrevivência na estimação de parâmetros genéticos. Todavia, os critérios para avaliar esta característica são vários, tal que em alguns destes nem todos os registros das vacas nos rebanhos podem ser levados em consideração, devido à metodologia de análise utilizada. Uma variável que é de fácil mensuração e já faz parte da maioria dos controles zootécnicos das fazendas é a idade da vaca ao último parto (IVUP). Neste trabalho, objetivo foi avaliar a longevidade das

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19

Müller, Regina Elizabeth. "Cardiopatia reumática com lesão valvar em crianças e adolescentes: fatores associados ao tempo até a terapêutica cirúrgica." Instituto Nacional de Saúde da Mulher, da Criança e do Adolescente Fernandes Figueira, 2011. https://www.arca.fiocruz.br/handle/icict/8042.

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Made available in DSpace on 2014-07-22T13:16:48Z (GMT). No. of bitstreams: 2 Regina Elizabeth Müller.pdf: 4161979 bytes, checksum: 5df884fdb04b617145c35c1741e9b502 (MD5) license.txt: 1914 bytes, checksum: 7d48279ffeed55da8dfe2f8e81f3b81f (MD5) Previous issue date: 2011<br>Fundação Oswaldo Cruz. Instituto Nacional de Saúde da Mulher, da Criança e do Adolescente Fernandes Figueira. Rio de Janeiro, RJ, Brasil.<br>Introdução: A cardiopatia reumática persiste como a principal doença cardiovascular adquirida em crianças e adultos jovens em todo o mundo, sendo responsável por altas taxas de morbimo

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20

Beuscart, Jean-Baptiste. "Risques concurrents et modèles multi-états dans les analyses de survie en dialyse." Phd thesis, Université du Droit et de la Santé - Lille II, 2012. http://tel.archives-ouvertes.fr/tel-00879223.

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Contexte : Dans les analyses de survie, un risque concurrent est un événement qui empêche l'observation de l'événement d'intérêt (le décès le plus souvent). Si la probabilité de survenue d'un risque concurrent dépend de la probabilité de l'événement d'intérêt, alors il ne peut pas être traité comme une censure. Les patients ayant une insuffisance rénale chronique terminale peuvent être traités par hémodialyse, dialyse péritonéale et greffe rénale. Ces traitements sont complémentaire et les patients peuvent passer d'une modalité de traitement à une autre au cours de leur prise en charge. La dép

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21

Carneiro, Ana Beatriz Sampaio e. Castro Lapa. "Estimação de distribuições multivariadas na presença de censura pela direita." Master's thesis, 2017. http://hdl.handle.net/1822/53351.

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Dissertação de mestrado em Estatística<br>Em diversos estudos longitudinais, os indivíduos ou itens em observação podem experimentar vários eventos de interesse ao longo de um determinado período de seguimento. Quando o evento de interesse pode ocorrer mais do que uma vez num indivíduo, estes eventos são designados de eventos recorrentes. Este tipo de dados é frequentemente observado em estudos de investigação médica, economia, engenharia e sociologia. Em estudos de investigação médica, os eventos recorrentes podem corresponder a múltiplas ocorrências de hospitalização de um grupo de doentes,

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22

Galloway, Katherine Anne Forsyth. "Precedence-type test based on the Nelson-Aalen estimator of the cumulative hazard function." 2013. http://hdl.handle.net/1993/21696.

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In reliability studies, the goal is to gain knowledge about a product's failure times or life expectancy. Precedence tests do not require large sample sizes and are used in reliability studies to compare the life-time distributions from two samples. Precedence tests are useful since they provide reliable results early in a life-test and the surviving units can be used in other tests. Ng and Balakrishnan (2010) proposed a precedence-type test based on the Kaplan-Meier estimator of the cumulative distribution function. A precedence-type test based on the Nelson-Aalen estimator of the cumula

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23

Šlegerová, Lenka. "Hodnocení zdravotní technologie (HTA): léčba karcinomu prsu, případová studie ČR." Master's thesis, 2019. http://www.nusl.cz/ntk/nusl-392652.

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Health technology assessment: case study on breast carcinoma treatment in the Czech Republic Bc. Lenka Šlegerová January 4, 2019 Abstract This thesis proposes an original method for assessing total costs of med- ical treatment. It defines the semi-Markov model with four states that are associated with specific costs of the treatment, and not with patients' health statuses. This method is applied to individuals' treatment data drawn from the Czech clinical practice in the treatment of the metastatic HER2+ breast cancer. The aim is to assess the cost-effectiveness of adding medication per- tuzum

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24

Bengura, Pepukai. "Identification of factors affecting the survival lifetime of HIV+ terminal patients in Albert Luthuli municipality of South Africa." Diss., 2019. http://hdl.handle.net/10500/26849.

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The objective of the study was to identify the factors that affect the survival lifetime of HIV+ terminal patients in rural district hospitals of Albert Luthuli municipality in the Mpumalanga province of South Africa. A cohort of HIV+ terminal patients was retrospectively followed from 2010 to 2017 until a patient died, was lost to follow-up or was still alive at the end of the observation period. Nonparametric survival analysis and semiparametric survival analysis methods were used to analyse the data. Through Cox proportional hazards regression modelling, it was found that ART adherence (poo

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