Goodness-of-fit tests for the frailty distribution in proportional hazards models with shared frailty. Hasselt University KU Leuven
Frailty models account for the clustering present in event time data. A proportional hazards model with shared frailties expresses the hazard for each subject.Often a one-parameter gamma distribution is assumed for the frailties. In this paper, we construct formal goodness-of-fit tests to test for gamma frailties. We construct a new class of frailty models that extend the gamma frailty model by using certain polynomial expansions that are ...