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st: Survival between groups


From   "Hugh Robinson" <hugh.robinson@umontana.edu>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Survival between groups
Date   Thu, 21 May 2009 19:15:45 -0600

I have two groups followed across different time periods.  I would like
to test for a difference in survival between groups.  It is my
understanding that sts test will not work because the survival curves
are for different periods (observed and expected events are exact and
therefore p=1.0).  

Do I need to model survival for both groups and then test between the
hazard ratios?

Hugh S Robinson Ph.D.
Postdoctoral Researcher
Wildlife Biology Program
College of Forestry and Conservation
University of Montana
Missoula, MT 59802
(406) 243-2931


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