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st: AW: DiD estimation versus fixed effects when T>2


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: AW: DiD estimation versus fixed effects when T>2
Date   Wed, 4 Mar 2009 16:52:27 +0100

<> 



You may find useful information on DiD (in particular: a helpful example) in http://www.stata.com/bookstore/mma.html, chap. 25.8
The do-file you want to look at is on http://cameron.econ.ucdavis.edu/mmabook/mmaprograms.html
"mma25p1treatment.do", with the data right next to it. I hope you know how to take it from there :-)



HTH
Martin


-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Riggieri, Alison C
Gesendet: Mittwoch, 4. März 2009 16:00
An: statalist@hsphsun2.harvard.edu
Betreff: st: DiD estimation versus fixed effects when T>2

I am attempting to take panel data (5 years, for all 50 states +DC) and determine a DiD estimation.  I have four different treatment variables, all dummy variables.  

My question is this:  my adviser told me to to run "xtreg y x treatment 2002 2003 2004 2005, fe" to get a DiD estimation, but I'm not sure that is correct.  He told me to just add dummy variables to the fixed effects regression.

Does that compute the DiD estimation or do I have to interact the treatment and the year?  

thanks in advance,

Alison

-- 
PhD Student
School of Public Policy
Georgia Institute of Technology
Atlanta, GA
508-410-1931
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