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Re: st: RE: survival analysis: an elementary question


From   Michael McCulloch <mm@pinest.org>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: survival analysis: an elementary question
Date   Fri, 3 Oct 2008 20:18:20 -0700

Sorry Kieran I wasn't clear. Yes, about the hazard ratio.
And thank you for clarifying.

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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