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Re: st: DiD
From
inggrid <[email protected]>
To
[email protected]
Subject
Re: st: DiD
Date
Wed, 30 Mar 2011 09:37:59 +0800 (SGT)
Hi Steve,
Thank you for your interest.
Indeed, from the data I posted here, the unreal data, I just want to give, since I have a large dataset, 17000 samples and 173 variables (hope you can understand). In general, the structure are the same. I would like to assess the impact of a program that has been implemented since 20005. I have an unbalanced panel data, between 2000 and 2005. Hence, I have information on the participation status in 2007. From the treated individuals in 2007, I derive "the treatment group". In other words, the treatment is 1 for all treated individuals regardless of year.
Kind regards,
Inggrid
--- On Wed, 3/30/11, Steven Samuels <[email protected]> wrote:
> From: Steven Samuels <[email protected]>
> Subject: Re: st: DiD
> To: [email protected]
> Date: Wednesday, March 30, 2011, 7:09 AM
> I apologize. Apparently you do have
> untreated families; but in your example (real?) data some
> have no pre-treatment observations.
>
> Steve
> Ingrid:
>
> You cannot do a DID design without a control group.
> The "DID" means "Difference in Differences". So one
> would compare after-before in the treated and in the
> control. In your data set you have only the difference
> in the treatment group.
>
>
> Steve
> [email protected]
>
>
>
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