Heterogeneity models in lifetime data analysis
Abstract
Differences between experimental units, which cannot be explained by the available covariates, are frequently observed in studies based on time-to-event data. Failure to take into account these differences may have serious consequences that cannot be ignored. Consequently, developing methods for incorporating this heterogeneity into statistical models is a necessary objective of survival and reliability analysis, the sector of statistics that deals with the analysis of lifetime data. The basic tools for introducing heterogeneity are frailty and mixture models. The properties of frailty models, and in particular proportional hazards frailty models, are the first topic studied in this thesis. Diagnostic tests are developed for the correct specification of the model. Methods of estimation of the proportional hazards model and of mixtures are developed for the case where data have been collected with biased sampling designs. Finally, the proportional odds frailty model is developed and stu ...
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