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

From   Nick Cox <>
To   "" <>
Subject   Re: st: Difference-in-Difference and matching using -diff
Date   Wed, 19 Jun 2013 12:02:21 +0100

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

Many people are lax on this, but that is no reason for you to ignore a
longstanding request.


On 19 June 2013 11:38, James Bernard <> 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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