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st: interactions

From   riyadh shamsan <>
Subject   st: interactions
Date   Wed, 31 Mar 2010 19:21:33 +0100

need to make interaction between 2 cat variables each with different
levels. (Ethnicity coded as 1,2,3 and 4) & (co-morbidity coded as
I need my reference group to be the group with ethnicity 1 &
co-morbidiy 0 and compare other combination with this group
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