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Simultaneous Modelling of Survival and Longitudinal Data with an Application to Repeated Quality of Life Measures

Overview
Journal Lifetime Data Anal
Publisher Springer
Date 2005 Jun 9
PMID 15940822
Citations 23
Authors
Donglin Zeng
Jianwen Cai
Affiliations
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Abstract

In biomedical studies, interest often focuses on the relationship between patient's characteristics or some risk factors and both quality of life and survival time of subjects under study. In this paper, we propose a simultaneous modelling of both quality of life and survival time using the observed covariates. Moreover, random effects are introduced into the simultaneous models to account for dependence between quality of life and survival time due to unobserved factors. EM algorithms are used to derive the point estimates for the parameters in the proposed model and profile likelihood function is used to estimate their variances. The asymptotic properties are established for our proposed estimators. Finally, simulation studies are conducted to examine the finite-sample properties of the proposed estimators and a liver transplantation data set is analyzed to illustrate our approaches.

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