st: propensity score matching with 3 groups

[=?ks_c_5601-1987?B?w9Ygwfa/rA==?= <jiyun1023@hotmail.com>]

HelIo...
I want perform propensity score matching with 3 groups not 2 group...But i
have no idea about 3 groups and there is n't likely any arcitle...
maybe if you have any articles relative to propensity score matching with 3
groups , I'd like to receive that.,,please...
may if you have any idea..I'd like to reveive that too.

Thank you


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