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st: RE: help with: i.region*i.time

From   "Martin Weiss" <>
To   <>
Subject   st: RE: help with: i.region*i.time
Date   Mon, 22 Sep 2008 15:06:20 +0200

If some non-standard application of -xi- is desired, use the first syntax
mentioned in -h xi- and kill (-drop-) the dummies you do not want. Then
insert the ones you do want in your estimation...


-----Original Message-----
[] On Behalf Of Galina An
Sent: Saturday, September 20, 2008 8:52 PM
Subject: st: help with: i.region*i.time

Dear stata users,
I was wondering if anybody could help me with the following (seemingly 
simple!) problem.
I need to keep interaction dummies in the regression, but not the 
dummies themselves.

For example, in the regression:

xi: reg y  x  i.region*t2 i.region*t3 i.region*t4

I need the interactions between region and time dummies, but not the 
region dummies themselves.

Galina An
Assistant Professor
Economics Department
Kenyon College

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