Likelihood inference for Birnbaum–Saunders frailty model with an application to bone marrow transplant data

Cluster failure time data are commonly encountered in survival analysis due to unobservable factors such as shared environmental conditions and genetic similarity. In such cases, careful attention needs to be paid to the correlation among the subjects within the same cluster. In addition, some diseases are curable due to the advancement of modern medical techniques. In this paper, we extend the frailty model based on Birnbaum–Saunders frailty …