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st: clogit data format


From   Margaret R Grove <[email protected]>
To   [email protected]
Subject   st: clogit data format
Date   Thu, 20 Mar 2008 07:42:36 -0400

Hi,

I'm attempting to use clogit and have a very basic question about the data format. It seems like it should be obvious but I'm getting very different answers than a colleague using SAS PHREG.

The data looks like this:

id rater rating
1 1 0
1 2 1
1 3 1
1 4 0
2 1 1
2 2 .
2 3 0
2 4 0
etc.

I want to look at the difference between raters (have already done kappa). I tried:

xi: clogit rating i.rater, group(id)

but, I get different results than with PHREG.

What am I doing wrong? Am I misunderstanding clogit?

Thank you!

Margaret

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