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st: estimating sample size in observational data


From   Michael McCulloch <mm@pinest.org>
To   Statalist <statalist@hsphsun2.harvard.edu>
Subject   st: estimating sample size in observational data
Date   Wed, 22 Nov 2006 17:52:31 -0800

Hello,
I have observation data in which patients have self-selected treatment
groups. I'll analyze these data using -stcox-.

I'd like to estimate a power-sample size curve at different group sizes.
I'd I have considered the program -artsurv-, but it looks like it's
designed specifically for random allocation. Is there another way to do
this in Stata?




Best wishes,
Michael


____________________________________

Michael McCulloch
Pine Street Clinic
Pine Street Foundation
124 Pine Street, San Anselmo, CA 94960-2674
tel     415.407.1357
fax     415.485.1065
email:  mm@pinest.org
web:    www.pinest.org
         www.pinestreetfoundation.org
         www.medepi.net/meta





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