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st: sample size estimation for cox model


From   moleps islon <moleps2@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: sample size estimation for cox model
Date   Tue, 15 Sep 2009 22:04:24 +0200

Dear listers,
How do I determine standard deviation (sd) for survival data in a cox model?

Is it correct to just use y=sqrt of e(V) and plug it into

stpower cox, hratio(x) sd(y) ??

regards,

M
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