1:1 Mahalanobis matching using psmatch2

[VictoriaSmith]

Dear all,

Is it possible to run one-to-one Mahalanobis matching using psmatch2?
Using the following code results in one-to-many matching ( [1, 13] range of the _weight values):

psmatch2 aqm, mahalanobis(age std_payor ch_score prov_area teach largehosp month) caliper (0.04) out(los)


Victoria

[Melissa Garrido]

You likely are doing one-to-one matching. The _weight variable also deviates from one if you are doing matching with replacement, which occurs within Mahalanobis matching in the user-written -psmatch2-

Hope this helps,
Melissa