The main objective of this book is to study frailty models and the numerical techniques, needed to fit such models, in a unified and detailed way. Both proportional hazards models and accelerated failure time models are discussed, we consider parametric as well as semi-parametric modeling. We fit frailty models using both a frequentist (classical approach) and a Bayesian approach. The main drawback is the lack of software. We will mainly use the available public freeware package, to fit the different... Mehr