Kmatch

[Meryle Weinstein]

I have used this syntax with Stata 17 and it worked fine. Am currently using Stata 18 and I get an error message and not sure how to get around it. TIA

. gen random= runiform()

. sort random

.
. global txvar mat

. global exact_vars_st lunch ethblk ethwht ethasian ethothr female ell swd lanothrengl grade9 grade10 grade10 grade11 grade12

. global match_vars_sch g8_zsci Manh Bronx Brooklyn Queens SI totreg per_ecdis per_black per_hisp per_asian per_white teacher_years_doe license_es license_gs

.
. kmatch md $txvar $match_vars_sch, over(year) ematch($exact_vars_st) nn(5) att wgen ebalance replace
class mm_density undefined
(18 lines skipped)
(error occurred while loading kmatch.ado)
r(3000);