Dear Friends,
I've been estimating a cox model with frailty. Unfortunately when I use
the option efron, the cumulative hazard is not an increasing function. Enzo
Coviello has told me that one year ago there was a similar comunication.
Is there still a bug or it does depend on frailty option?
Secondly, I'm looking for a reference where the philosophical difference
between logit/probit and duration is explained. Please Have you got articles?
Thanks
Giorgio
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