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: [email protected]
http://myprofile.cos.com/mccaul
_______________________________________________
The fact that no one understands you doesn't make you an artist.
-----Original Message-----
From: [email protected]
[mailto:[email protected]] 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
[email protected]
www.pinestreetfoundation.org
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