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st: Multiple Failures and Frailty


From   ricchiuti.g@tiscali.it
To   statalist@hsphsun2.harvard.edu
Subject   st: Multiple Failures and Frailty
Date   Fri, 30 Apr 2004 10:30:32 +0200

Mario Cleves, www.stata.com/support/faqs/stat/stmfail.html, explains the
variance-covariance approach to analyze the multiple failure data. I have
a dataset with 26 subjects and multiple-failures for each subject and I
need to estimate a cox model with failty. 
Does anyone know whether the following commands are correct to implement
a frailty model with multiple-failure data? 

stset time, fail(event) id(country) exit(time .) origin(time0) 

stgen nf=nfailure()

stcox grow trade deficit laggrowthexp diffrer, shared(nf) efron nohr

or should I use 

stcox grow trade deficit laggrowthexp diffrer, shared(country) efron nohr

Thanks a lot for your suggestion 
Giorgio 


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