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Re: st: Differebnce-in-Difference and Stata

From   Austin Nichols <>
Subject   Re: st: Differebnce-in-Difference and Stata
Date   Tue, 7 May 2013 17:12:37 -0400

James Bernard <> :
Diff in diff is just a regression with appropriate interaction terms,
and in general you can put any kind of fixed effects in a count model
that you want to. As for diff in diff in a nonlinear model more
generally, the Statalist archives are full of relevant material e.g.
and read
to aid thinking about what specific kind of effect you want to estimate.

On Tue, May 7, 2013 at 10:10 AM, James Bernard <> wrote:
> 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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