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st: Differebnce-in-Difference and Stata

From   James Bernard <>
Subject   st: Differebnce-in-Difference and Stata
Date   Tue, 7 May 2013 22:10:01 +0800

Hi all,

There is a user written Stata command for Difference-in-Difference
(DD) by: Villa, Juan M. 2011. DIFF: Stata Module to Perform
Differences in Differences Estimation. Statistical Software
Components. Boston College Department of Economics

It seems like a nice and reliable command, but it is written for a
linear model. I have two questions:

1- Can the logic of DD be applied to non-linear panel models (count models)?

2- Does anyone know of a command for a non-linear DD?

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