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st: psmatch2 and matching within the metropolitan area


From   Hui-shien Tsao <ht7651@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: psmatch2 and matching within the metropolitan area
Date   Fri, 07 Apr 2006 12:41:28 -0400

Hi all ---

I am using psmatch2 to conduct propensity score matching. My data is a pool of cases from four metropolitan areas. I would like to match the treated tracts to the untreated tracts within the same metropolitan area. I have tried to create dummy variables to control for metropolitan areas. However, some of the matches still pick tracts from a different metropolitan area. Is there any way I can match within the same metropolitan area? Thank you for your help in advance.

Hui-shien

*****
Here is my syntax:

gen random=uniform()
sort random
psmatch2 treat metro1 metro2 metro3 var1 var2 var3 var4, logit neighbor(1) common trim(3)

A simplified data structure:

id metro treat Var1 Var2 Var3
1 1 1 1 4 4
2 1 0 2 1 3
3 1 0 3 1 1
4 1 0 3 5 2
5 1 1 2 3 5
6 2 0 1 1 3
7 2 0 1 2 8
8 2 0 2 5 6
9 2 0 3 3 3
10 2 1 3 7 1
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