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Re: st: identifying comparison groups with similar distributions along one metric


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: identifying comparison groups with similar distributions along one metric
Date   Tue, 20 Oct 2009 08:29:32 -0700 (PDT)

--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany

http://www.maartenbuis.nl
--------------------------


--- On Tue, 20/10/09, Kate Rohrbaugh wrote:
> I have a dataset of about 300 observations and I am going
> to separate them into 4 groups -- not totally equal in size
> but based on certain characteristics.  I want the four
> groups to all have similar distributions along a certain
> metric (i.e., cost) -- so the mean, median, SD, etc., are
> similar, so I want to sample observations from each
> group.  I'll choose one of the four groups as my
> baseline (probably the one with smallest range or the fewest
> number of observations - but I'm open to any suggestions
> about that as well).  
> 
> What's the best approach for doing this?  I suspect
> this question has been addressed numerous times in various
> places, so being pointed in the right direction is
> sufficient.  Note: we still have Stata 9.2, so nothing
> too fancy.

Sounds like propensity score matching using a single variable.
This is implemented in Stata by Edwin Leuven and Barbara 
Sianesi as the -psmatch2- package, which will run under
Stata 9.2. To install that package type in Stata:
-ssc install psmatch2-.

Hope this helps,
Maarten


      

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