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


From   "Kieran McCaul" <kamccaul@meddent.uwa.edu.au>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: RE: survival analysis: an elementary question
Date   Sat, 4 Oct 2008 11:33:06 +0800

If your program is actually calculating the CI around the HR and you're
getting a negative lower bound, then you must be doing something wrong
in the calculation.  

______________________________________________
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 11:18 AM
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: RE: survival analysis: an elementary question

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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