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Weibull extension of bivariate exponential regression model with different frailty distributions

Hanagal, David - In: Statistical Papers 50 (2009) 1, pp. 29-49

Persistent link: https://www.econbiz.de/10005615801

Weibull Extension of Bivariate Exponential Regression Model with Gamma Frailty for Survival Data

Hanagal, David D. - In: Stochastics and Quality Control 21 (2006) 2, pp. 261-270

Abstract A maximum likelihood estimation procedure is developed for a bivariate frailty regression model, in which … survival times of twin births (both monozygotic and dizygotic), with genetic frailty behavior (which is unknown and random) of …

Persistent link: https://www.econbiz.de/10014590816

Bivariate Weibull regression model based on censored samples

Hanagal, David - In: Statistical Papers 47 (2006) 1, pp. 137-147

Persistent link: https://www.econbiz.de/10008533897

Parametric Bivariate Regression Analysis Based on Censored Samples: A Weibull Model

Hanagal, David D. - In: Stochastics and Quality Control 19 (2004) 1, pp. 83-90

Abstract In this paper, we propose a new bivariateWeibull distribution and derive estimation and test procedures based on censored samples with common covariates. The study of bivariate Weibull was motivated by interesting biometrical applications. The maximum likelihood estimators for the model...

Persistent link: https://www.econbiz.de/10014590776

A Bivariate Weibull Regression Model

Hanagal, David D. - In: Stochastics and Quality Control 20 (2005) 1, pp. 143-150

Abstract In this paper, we propose a new bivariate Weibull regression model based on censored samples with common covariates. There are some interesting biometrical situations which motivate the study of a bivariate Weibull regression model of the proposed type. A procedure for obtaining the...

Persistent link: https://www.econbiz.de/10014590781

Weibull Extension of a Bivariate Exponential Regression Model

Hanagal, David - In: Stochastics and Quality Control 20 (2005) 2, pp. 247-253

Abstract In this paper, we propose a bivariate Weibull regression models for survival time derived from the bivariate exponential distribution of Freund [Freund, Journal of the Amer. Statist. Assoc. 56: 971-77, 1961]. There are some biometrical applications which motivated to study these...

Persistent link: https://www.econbiz.de/10014590790

Gamma Frailty Regression Models in Mixture Distributions

Hanagal, David D. - In: Stochastics and Quality Control 22 (2007) 2, pp. 295-302

Abstract We propose frailty regression models in mixture distributions assuming the distribution of frailty to be a … (which is unknown and random) of patients follows a known frailty distribution. These are the situations, which motivate to …

Persistent link: https://www.econbiz.de/10014590841

Parametric frailty and shared frailty survival models

Gutierrez, Roberto G. - In: Stata Journal 2 (2002) 1, pp. 22-44

Frailty models are the survival data analog to regression models, which account for heterogeneity and random effects. A … estimated along with the other model parameters. A frailty model is an heterogeneity model where the frailties are assumed to be … frailty is a latent multiplicative effect on the hazard function and is assumed to have unit mean and variance theta, which is …

Persistent link: https://www.econbiz.de/10005568783

Life Expectancy at Current Rates vs. Current Conditions

Vaupel, James W. - In: Demographic Research 7 (2002) 8, pp. 365-378

methods. Finally, it speculates that there may be a deep connection between tempo and heterogeneity. …

Persistent link: https://www.econbiz.de/10005557955

Mortality modeling: A review

Yashin, Anatoli; Iachine, Ivan; Begun, Alexander - In: Mathematical Population Studies 8 (2000) 4, pp. 305-332

the notions of heterogeneity and frailty, as well as that of changes in the “repair capacity”; of organisms. Furthermore …

Persistent link: https://www.econbiz.de/10009205503