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st: xi2 and i. vs s.

From   "Wendell Joice" <>
To   <>
Subject   st: xi2 and i. vs s.
Date   Tue, 8 Apr 2003 10:45:43 -0400

Dear Statalist
Using Stata 7, I have been experimenting (aka trying to learn) with xi2
since conceptually it seems to help me with testing simple comparisons after
logistic regression.

I noted that if you run a statement like:
"xi2: logistic psycther i.race*i.region"   (race_1 and region_1 omitted:
the resulting odds ratios for race_2 , race_3 etc   will be different from
those obtained from
"xi2: logistic psycther s.race*s.region"  (race_1 and region_1 omitted:

Why is there a difference?

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