1.3

• option BS (Birnbaum-Saunders) was added in frailty.fit function

1.2

• fixed bugs in summary.extrafrail function

1.1

• function frailtyWL was deprecated
• function frailty.fit was included. Besides the shared weighted Lindley frailty model, this function allows to perform estimation for the shared gamma and shared inverse gaussian frailty models.