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st: survival analysis


From   Joana Mendon´┐Ża <[email protected]>
To   <[email protected]>
Subject   st: survival analysis
Date   Mon, 24 Jan 2005 16:00:40 -0000

I am doing survival analysis on stata. After declaring the data set to be
survival data I tried to run a proportional hazard model, but it gives me an
error of "no observations". 
Can anyone tell me why this may be?
Thank you all. 
Joana


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