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st: RE: survival analysis: an elementary question


From   "Kieran McCaul" <kamccaul@meddent.uwa.edu.au>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: survival analysis: an elementary question
Date   Sat, 4 Oct 2008 11:15:38 +0800

Are you looking at the hazard ratio or the beta coefficient?  The CI
around the HR can't be negative, but it can be negative around the beta.

______________________________________________
Kieran McCaul MPH PhD
WA Centre for Health & Ageing (M573)
University of Western Australia
Level 6, Ainslie House
48 Murray St
Perth 6000
Phone: (08) 9224-2140
Fax: (08) 9224 8009
email: kamccaul@meddent.uwa.edu.au
http://myprofile.cos.com/mccaul 
_______________________________________________
The fact that no one understands you doesn't make you an artist.


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Michael
McCulloch
Sent: Saturday, 4 October 2008 11:02 AM
To: Statalist
Subject: st: survival analysis: an elementary question

Hello,
Is it theoretically possible for the 95% confidence interval about 
the hazard ratio to include 0, such that the lower bound is a 
negative number? I've encountered into this with a program I've 
written (too long to post here, and I don't want to bother anyone), 
but I'm certain I've done something incorrectly. Might someone have a 
moment to clarify this question?


-- 

Best wishes,
Michael McCulloch



Pine Street Foundation
124 Pine St., San Anselmo, CA 94960-2674
Tel:	(415) 407-1357
Fax:	(415) 485-1065
mcculloch@pinestreetfoundation.org
www.pinestreetfoundation.org
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