Mahalanobis and Propensity score Matching
psmatch2 is a Stata module that implements full Mahalanobis matching and a variety of propensity score matching methods to adjust for pre-treatment observable differences between a group of treated and a group of untreated.
It provides three commands: -psmatch2- perform the matching, -pstest- reports balancing, and -psgraph- display support for the propensity score.