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Title: Joint scale change models for recurrent events and failure time Authors:  Gongjun Xu - University of Michigan (United States)
Sy Han Chiou - University of Texas at Dallas (United States)
Chiung-Yu Huang - Johns Hopkins University (United States)
Jun Yan - University of Connecticut (United States)
Chiung-Yu Huang - University of California, San Francisco (United States) [presenting]
Abstract: Recurrent event data arise frequently in various fields such as biomedical sciences, public health, engineering, and social sciences. In many instances, the observation of the recurrent event process can be stopped by the occurrence of a correlated failure event, such as treatment failure and death. We propose a joint scale-change model for the recurrent event process and the failure time, where a shared frailty variable is used to model the association between the two types of outcomes. In contrast to the popular Cox-type joint modeling approaches, the regression parameters in the proposed joint scale-change model have marginal interpretations. The proposed approach is robust in the sense that no parametric assumption is imposed on the distribution of the unobserved frailty and that we do not need the strong Poisson-type assumption for the recurrent event process. We establish consistency and asymptotic normality of the proposed semiparametric estimators under suitable regularity conditions. To estimate the corresponding variances of the estimators, we develop a computationally efficient resampling-based procedure. Simulation studies and an analysis illustrate the performance of the proposed method.