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st: clogit message question

From   Julia Gamas <[email protected]>
To   [email protected]
Subject   st: clogit message question
Date   Fri, 21 Jan 2005 16:40:24 -0500

Hi all,
when running clogit I get the follwing message:
"7618 groups (7618 obs) dropped due to all positive or all negative outcomes."
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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