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st: interpreting stset


From   Michael McCulloch <mm@pinest.org>
To   Statalist <statalist@hsphsun2.harvard.edu>
Subject   st: interpreting stset
Date   Wed, 13 Aug 2008 10:58:34 -0700

Hello,
I've stset survival data, and received these messages:
"      12  multiple records at same instant                     PROBABLE ERROR
            (risktime[_n-1]==risktime)
        22  obs. begin on or after (first) failure?"

I'd like to ask for help in understanding what is meant by "same instant".
And, since subjects were recruited over several years' time, I'm not 
sure why it would be a problem if observations begin on or after 
(first) failure.

-- 

Best wishes,
Michael McCulloch



Pine Street Foundation
124 Pine St., San Anselmo, CA 94960-2674
Tel:	(415) 407-1357
Fax:	(415) 485-1065
mcculloch@pinestreetfoundation.org
www.pinestreetfoundation.org

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