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st: RE: clogit message question

From   Leonelo Bautista <[email protected]>
To   [email protected]
Subject   st: RE: clogit message question
Date   Fri, 21 Jan 2005 15:53:21 -0600

Hi Julia,
I have the impression you're still dealing with the same problem, but I'm
not sure. What this means is that within those groups all observations have
the same value for the dependent variable. Since they are all "cases" or all
"non-cases", they are "concordant" and do not contribute to the estimation
of the contrast between cases and non-cases.

I hope this helps,

Leonelo Bautista

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Julia Gamas
Sent: Friday, January 21, 2005 3:40 PM
To: [email protected]
Subject: st: clogit message question

Hi all,
when running clogit I get the follwing message:
"7618 groups (7618 obs) dropped due to all positive or all negative
Can anybody tell me what this means "all positive or all negative outcomes"?
Thank you for any help.
Julia A. Gamas
Mexico City Project, EAPS

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