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Re: st: matching within groups


From   Austin Nichols <austinnichols@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: matching within groups
Date   Wed, 7 Mar 2012 09:49:43 -0500

Christoph Willing <christoph.willing@gmail.com>:
Finding the closest propensity score within group
is easily done with -psmatch2- (SSC); see e.g.
http://www.stata.com/statalist/archive/2011-10/msg00899.html
Note that -nnmatch- (SSC) can provide a different
matching strategy closer to your stated desiderata.

On Wed, Mar 7, 2012 at 8:19 AM, Christoph Willing
<christoph.willing@gmail.com> wrote:
> Dear Statalist,
>
> I am trying to find a matching untreated company for each treated
> company in my sample, based on pre-treatment firm characteristics.
> My observations are grouped by country, industry and year, and the
> matching should happen within a group.
> I am not yet interested in the treatment effect, but simply want to
> find the one nearest neighbour for each treated company that is most
> similar in its firm characteristics.
>
> I have run a pooled logit for the entire sample of the form "logit
> treatment firm-characteristics" and predicted the propensity scores.
> Now I am stuck at finding the nearest neighbours within the groups.
> The matter is complicated by the fact that in some groups there are
> more than one treated company.
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