I very much appreciate the information, and I will keep that in mind. However, what i need to do in my current work is to take the three year average of OLS coefficients of the same regressor and find some standard error for that. My command of statistics is not great, so the answer might be simpler than you think.
--- M.Buis@fsw.vu.nl wrote:
From: "Maarten Buis" <M.Buis@fsw.vu.nl>
To: <statalist@hsphsun2.harvard.edu>
Subject: st: RE: RE: Standard Errors
Date: Tue, 28 Nov 2006 12:18:32 +0100
--- I wrote:
> An even better and easier way to get
> such a combined estimate is to constrain the effect of
> explanatory variable to be the same across years. This is
> actually very simple to do, since all you have to do is
> *not* add an interaction term with year.
A detailed description of interaction effects and lots of
Stata examples can be found on:
http://www.ats.ucla.edu/stat/stata/webbooks/reg/chapter3/statareg3.htm
http://www.ats.ucla.edu/stat/stata/webbooks/reg/chapter6/statareg6.htm
HTH,
Maarten
-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands
visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434
+31 20 5986715
http://home.fsw.vu.nl/m.buis/
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