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st: Efron and Cumulative hazard


From   ricchiuti.g@tiscali.it
To   "stata" <statalist@hsphsun2.harvard.edu>
Subject   st: Efron and Cumulative hazard
Date   Thu, 13 May 2004 10:23:13 +0200

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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