st: Propensity Score Matching

["Cristian Mackenna" <chicomackenna@hotmail.com>]

Did someone now why with the same sample and the same pscore varname, if I 
run

psmatch2 with Gaussian kernel

the untreated group and the treated group have deferent�s number that if I 
run

attk

even if the ATT calculated is the same

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