Matched datasets

[April Kimm]

I am using the code below for the nearest matching but I am struggling with obtaining a matched dataset for further analyses. I used the following commands but it did not work. Can anyone please help me?

teffects nnmatch (DV IVs) (treatment_variable), generate (newvar)

gen obsnum = _n
keep newvar*
stack newvar*, into(obsnum) clear
drop _stack
bysort obsnum: keep if (_n == 1)
gen byte in_sample = 1
tempfile matchsample
save `matchsample'

[Øyvind Snilsberg]

this works for me,

webuse cattaneo2, clear

gen obsnum = _n

preserve
teffects nnmatch (bweight mage prenatal1 mmarried fbaby) (mbsmoke), 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)

matched sample are observations with -_merge==3-

[April Kimm]

Thank you! It worked well.