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st: Test coefficients


From   Miguel Angel Valencia Garza <miguel.valencia@sat.gob.mx>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: Test coefficients
Date   Wed, 18 Apr 2012 14:36:58 +0000

Dear all,

I had estimated the regression coefficients for a panel (using xtgee). This was 8 months ago. I use this model to analyze the behavior of taxpayers and asses certain features. Now, I have updated the panel; i.e. I have fitted a new xtgee model with this panel. However, the coefficients look similar to the ones I'd estimated before.

What test (or tests) should I perform in order to proving this hypothesis (H0: coeff_betas_8months_ago = coeff_betas_updated)? Can this test be done in Stata? Thank you all.

Best wishes,
Miguel Valencia-Garza

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