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st: test coefficients across models

From   xinzheng shi <>
Subject   st: test coefficients across models
Date   Wed, 12 Sep 2007 19:11:33 -0700 (PDT)

Dear all, 
  I have a question. I run two regressions as the
  (1) reg Y X1 X2, cluster(id)
  (2) reg Y X1   , cluster(id) 
I would like to test the coefficients before X1 in
these two regressions are the same. But I cannot do it
using "hausman" since I used cluster. I also cannot do
it using "hausman, force". Any one knows how to do
it(the simpler, the better)? 


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