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Re: st: RE: Power calculation for competing risks regression


From   Christoph Engel <engel@coll.mpg.de>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: Power calculation for competing risks regression
Date   Mon, 22 Aug 2011 18:19:29 +0200

Dear David,

Hoping that this does not violate the Stata list etiquette: Here is the link to a free, very powerful power calculator, which a German colleague of mine has programmed. Maybet that helps.

http://www.psycho.uni-duesseldorf.de/aap/projects/gpower/

Best

Christoph




Am 8/22/2011 5:29 PM, schrieb Hackney, David:
Hello all,

Does anyone have advice on power (or sample size) calculations for competing risks (stcrreg) in Stata? We did a competing risks regression and found that the HR for the variable of interest was non-significant and the reviewers (reasonably) asked for a post-hoc power analysis to provide support for our conclusion. There is no competing risk model specific power calculation which appears to be available, though I didn't know if one of the other power commands could be modified to accommodate competing events, or if a user-written program existed (I couldn't find one with the search function). Thanks.

David Hackney



PS.  My apologies if I have sent this multiple times, I'm just not sure if I have done it correctly.  Thanks.


David N Hackney MD, MS
Assistant Professor
Division of Maternal-Fetal Medicine
Department of Obstetrics and Gynecology
University of Rochester Medical Center
Phone (admin assistant): 585-275-7480
Fax: 585-256-1416
david_hackney@URMC.rochester.edu

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--
_________________________________________________________________
Prof. Dr. Christoph Engel
Max-Planck-Institut zur
Erforschung von Gemeinschaftsgütern
Max Planck Institute for Research on Collective Goods
Kurt-Schumacher-Strasse 10
D 53113 Bonn
Tel. +49/228/91416-10
Fax +49/228/91416-11
e-mail: engel@coll.mpg.de
http://www.coll.mpg.de
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http://ideas.repec.org/e/pen22.html
http://papers.ssrn.com/sol3/cf_dev/AbsByAuth.cfm?per_id=251559
_________________________________________________________________

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