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Re: st: Differebnce-in-Difference and Stata


From   James Bernard <jamesstatalist@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Differebnce-in-Difference and Stata
Date   Wed, 8 May 2013 09:47:07 +0800

Thanks Austin for the tips and material

Regards,
James




On Wed, May 8, 2013 at 5:12 AM, Austin Nichols <austinnichols@gmail.com> wrote:
> James Bernard <jamesstatalist@gmail.com> :
> 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.
> http://www.stata.com/statalist/archive/2009-09/msg00901.html
> http://www.stata.com/statalist/archive/2012-02/msg00576.html
> and read
> http://ftp.iza.org/dp3478.pdf
> http://kuznets.fas.harvard.edu/~athey/CIC.pdf
> to aid thinking about what specific kind of effect you want to estimate.
>
> On Tue, May 7, 2013 at 10:10 AM, James Bernard <jamesstatalist@gmail.com> 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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