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Re: st: DiD
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[email protected]
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Subject
Re: st: DiD
Date
Tue, 29 Mar 2011 10:55:22 +0200
Dear Inggrid,
I think I'd need to know what you are exactly doing in order to answer properly (the command, with the explanations of what the variables stand for), so I can give you just an idea.
My guess is that, if you're using DID, you're interested in the difference before/later a given threeshold for 2 different groups. If you use year dummies, such difference is "absorbed" by them. I mean: you're interested in the difference across years, so you shouldn't treat it as a confounding factor.
Federico
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