psmatch2 save treated and matched dataset

[Rochelle Zhang]

Hey all,

I was using psmatch2 selecting 10 nearest match. My full sample has 100k observations, among which 585 are treated.

after running psmatch2. I see these varaibles added to my data

_treated _support _id _n1 _n2 _n3 _n4 _n5 _n6 _n7 _n8 _n10 _nn

to save only treated and control observations , that is drop those that are neither, what filter should I apply (maybe a line of code needed ?)

is it something like

drop if _n1==. & _n2==. & _n3==. & _n4==. &  _n5==. &  _n6==. &  _n7==. &  _n8==. &  _n9==.

thanks,

Rochelle