Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: st: matching within groups
From
Austin Nichols <[email protected]>
To
[email protected]
Subject
Re: st: matching within groups
Date
Wed, 7 Mar 2012 09:49:43 -0500
Christoph Willing <[email protected]>:
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
<[email protected]> 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.
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/