:

1) psmatch2 TreatmentVar (list of Xs), outcome neighbor(1) common

2) psmatch2 TreatmentVar (list of Xs), outcome common

then run the below command:

attnd outcome Treatment , pscore()

The second way of estimating ATT gives considerably higher t-stat.

Please suggest which is the right way to estimate ATT using psmatch2.

Note: I cannot use pscore command as my x list contains categorical variable