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Re: st: Matching


From   Santosh Kumar <santosh.uh@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Matching
Date   Mon, 4 Oct 2010 18:35:45 -0400

This is an example of matching with 3 neighbors.

psmatch2 improved, pscore(pscore) outcome(diarr) common caliper(.001)
neighbor(3)
There are observations with identical propensity score values.
The sort order of the data could affect your results.
Make sure that the sort order is random before calling psmatch2.
(4005 missing values generated)

Variable     Sample     Treated     Controls   Difference         S.E.   T-stat

diarr  Unmatched  .104890901   .125810627  -.020919727   .001373497   -15.23
ATT  .104893374   .110885821  -.005992448   .007151216    -0.84

Note: S.E. for ATT does not take into account that the propensity
score is estimated.

psmatch2:    psmatch2: Common
Treatment         support
assignment  Off suppo  On suppor      Total

Untreated          0    159,136    159,136
Treated          2     84,829     84,831

Total          2    243,965    243,967

On Mon, Oct 4, 2010 at 6:28 PM, Sophie Jensen <thorns.n.roses@gmail.com> wrote:
> Could someone perhaps explain the process of this kind of matching please.
>
> Thanks
>
> S
>
> On Mon, Oct 4, 2010 at 11:26 PM, Sophie Jensen <thorns.n.roses@gmail.com> wrote:
>> Dear statlisters,
>>
>> What is the difference between a 1-1 to match and the nearest
>> neighbour match in stata. I would like to do a nearest neighbour
>> match, a 1-1 and then specifiy a distance to match on.
>>
>> Thanks
>>
>> S
>> *
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>> *   http://www.ats.ucla.edu/stat/stata/
>>
>
> *
> *   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/
>



-- 

Santosh

*
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