Identifying matched cases after nearest neighbor maching

[April Kimm]

I used to the following codes to obtain matched dataset. However it only says "matched" as a whole and I am not sure how to specifically identify matched pairs (for example, a specific case is matched to which case).


Can anyone please help me? Thank you very much.


gen obsnum = _n

preserve

teffects nnmatch (DV IVs) (treatment), gen(newvar)

stack newvar*, into(obsnum) clear

bys obsnum: keep if _n==1

tempfile matched

save `matched'

restore

merge 1:1 obsnum using `matched', keepus(obsnum)