Proportional odds frailty model and stochastic comparisons
In this paper, we present some distributional properties of the survival and frailty distribution involved in the proportional odds (PO) frailty model. Stochastic orderings are studied for this proportional odds frailty model. It is showed that negative dependence arises in the PO frailty model as opposed to the proportional hazard frailty model. Copyright The Institute of Statistical Mathematics, Tokyo 2014