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RE: st: interactions

From   "Martin Weiss" <>
To   <>
Subject   RE: st: interactions
Date   Wed, 31 Mar 2010 20:48:36 +0200


So if Riyadh wanted domestic cars with very good repair record as the reference group:

sysuse auto, clear
reg price weight ib1.rep78#ib0.foreign


-----Original Message-----
From: [] On Behalf Of Maarten buis
Sent: Mittwoch, 31. März 2010 20:38
Subject: Re: st: interactions

--- On Wed, 31/3/10, riyadh shamsan wrote:
> need to make interaction between 2
> cat variables each with different
> levels. (Ethnicity coded as 1,2,3 and 4) &
> (co-morbidity coded as 0,1,2,3)
> I need my reference group to be the group with ethnicity 1
> & co-morbidiy 0 and compare other combination with this
> group

The first line of your question got zapped by 
by the listserver (this sometimes happens on the
statalist), so I am infering some of the details
of your question.

The answer would something like:
regress y ib1.ethnicity##ib0.comob

See -help fvvarlist-.

Hope this helps,

Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen


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