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st: PSMATCH2 for Mahalanobis matching within calipers


From   Yu Ye <yuyesj@hotmail.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: PSMATCH2 for Mahalanobis matching within calipers
Date   Tue, 18 Dec 2007 13:27:35 -0800

Dear all,
 
I am comparing several propensity score matching methods using PSMATCH2. When I am doing Mahalanobis matching within calipers defined by estimated propensity score, it looks like giving me the same result of Mahalanobis matching without specifying the PS score calipers. I am using the following command:
 
psmatch2 exposure_variable, out(outcome_varialbe) ps(ps_predicted) mahal(var1_var10) cal(0.4) ate
 
ps_predicted is the predicted propensity score from an earlier step. However, taking out the "ps(ps_predicted)" option gives me the same result, making me wonder it is just doing Mahalanobis distance matching.
 
Did I miss something here? Or the procedure just doesn't handle Mahalanobis matching within calipers defined by estimated propensity score?
 
Thanks in advance,
Yu
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