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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