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http://dx.doi.org/10.5351/KJAS.2017.30.4.539

Additive hazards models for interval-censored semi-competing risks data with missing intermediate events  

Kim, Jayoun (Research Coordinating Center, Konkuk University Medical Center)
Kim, Jinheum (Department of Applied Statistics, University of Suwon)
Publication Information
The Korean Journal of Applied Statistics / v.30, no.4, 2017 , pp. 539-553 More about this Journal
Abstract
We propose a multi-state model to analyze semi-competing risks data with interval-censored or missing intermediate events. This model is an extension of the three states of the illness-death model: healthy, disease, and dead. The 'diseased' state can be considered as the intermediate event. Two more states are added into the illness-death model to incorporate the missing events, which are caused by a loss of follow-up before the end of a study. One of them is a state of the lost-to-follow-up (LTF), and the other is an unobservable state that represents an intermediate event experienced after the occurrence of LTF. Given covariates, we employ the Lin and Ying additive hazards model with log-normal frailty and construct a conditional likelihood to estimate transition intensities between states in the multi-state model. A marginalization of the full likelihood is completed using adaptive importance sampling, and the optimal solution of the regression parameters is achieved through an iterative quasi-Newton algorithm. Simulation studies are performed to investigate the finite-sample performance of the proposed estimation method in terms of empirical coverage probability of true regression parameters. Our proposed method is also illustrated with a dataset adapted from Helmer et al. (2001).
Keywords
additive hazards model; log-normal frailty; interval-censored or missing intermediate event; multi-state model; semi-competing risks data;
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