st: RE: pscore and attnd

[Joe Canner <jcanner1@jhmi.edu>]

Rossella,

I haven't used -pscore- and -attnd- lately (in favor of -psmatch2-), but according to the -attnd- help:

where match_options are

        matchvar(newvarname) matchdta(newfilename) id(varname)

        In nearest neighbor matching, where not all controls are necessarily used in the
        computation of the ATT, it is often useful to identify those observations which were
        actually used.  The option matchvar(newvarname) together with matchdta(newfilename)
        allows to save a dataset containing the treatment indicator, the estimated propensity
        score (with the variable name pscore or the name specified by the user with the
        option pscore(scorevar)), and a dummy indicating whether an observation was used in
        the computation of the ATT. Furthermore, when a variable which identifies
        observations exists in the dataset, users can specify a variable name for this ID
        variable using the option id(varname) and this is saved as well.  In detail, the
        options are described below.

Regards,
Joe Canner
Johns Hopkins University School of Medicine

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Rossella Verzulli
Sent: Monday, March 24, 2014 11:37 AM
To: statalist@hsphsun2.harvard.edu
Subject: st: pscore and attnd

Dear Statalist,

I am using pscore and attnd commands to find the nearest neighbour of each treated unit in my sample.

Could you please help me to find out how I can identify the group of matched control units? I would like to do some post-matching analysis after restricting my dataset to this sub-sample..

I will be very grateful for your advice.

Best,
Rossella


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