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st: Possible to use stsum with variables that are tvc?


From   "Wagner, Joseph" <WagnerJ@edc.pitt.edu>
To   "STATAList (statalist@hsphsun2.harvard.edu)" <statalist@hsphsun2.harvard.edu>
Subject   st: Possible to use stsum with variables that are tvc?
Date   Wed, 1 Sep 2004 16:45:38 -0400

I used the -tvc- option in an -stcox- command.  Is it possible to use
-stsum- to obtain incidence rates for a variable if it is a time varying
covariate(tvc)?  

Suppose I want the rate of x and I have xdate which is the date when x
begins and represents some portion of a subjects survival time.  If I use:

. stcox tvc(xdate) 

can I obtain the incidence rate from: 	

. stsum x

Or do I need to -stsplit- my data first?
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