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Re: st: Difference-in-Difference and matching using -diff


From   James Bernard <jamesstatalist@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Difference-in-Difference and matching using -diff
Date   Thu, 20 Jun 2013 21:59:57 +0800

I am re-sending my question on the command





On Wed, Jun 19, 2013 at 7:32 PM, James Bernard <jamesstatalist@gmail.com> wrote:
> Sorry for this. I never realized that there is such thing
>
> -diff comes from SJ:   http://ideas.repec.org/p/pra/mprapa/43943.html
>
> so is -psocre. It is from SJ :
> http://www.stata-journal.com/sjpdf.html?articlenum=st0026
>
> Thanks,
> James
>
>
>
> On Wed, Jun 19, 2013 at 7:02 PM, Nick Cox <njcoxstata@gmail.com> wrote:
>> Although you have very recently had a reminder of our practices you
>> still persist in not explaining where user-written programs come from.
>> -pscore- and -diff- both need to be explained. Suggested forms are
>> given at
>>
>> http://www.stata.com/support/faqs/resources/statalist-faq/#stata
>>
>> Many people are lax on this, but that is no reason for you to ignore a
>> longstanding request.
>>
>> Nick
>> njcoxstata@gmail.com
>>
>>
>> On 19 June 2013 11:38, James Bernard <jamesstatalist@gmail.com> wrote:
>>
>>> the user-written command -diff seems like a panacea for all the
>>> problems one may face in doing propensity score matching and
>>> difference-in-difference. It is fairly simple to implement and there
>>> are enough options to work with.
>>>
>>> A good difference-in-difference analysis involves matching of the
>>> control and treatment groups, so that they are very similar in every
>>> possible way, except receiving the treatment. Matching is often done
>>> via propensity score matching (-pscore) etc.
>>>
>>> I would like to know if any of you have used this command. How
>>> reliable is it? Can I truly say that I did propensity score matching
>>> and then did difference-in-difference by just running diff and
>>> supplying it with control variables.
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