Select 3 controls after PSMATCH2

[May Blake]

I have a dataset with 20,000 observations. I am interested in an outcome which 200 of the observations have so I would like to select controls for the 200 observations. I used the PSMATCH2 command below. I still got 5000 controls to my 200 cases. How do I go about selecting 3 controls only per case so that I have 600 controls to my 200 cases? Thank you.

psmatch2 outcome age bmi, neighbor(1)

[George Ford]

I think neighbor(3) gets you the 3 nearest matches.

you need to have the treatment variable in place of outcome and add after the comma outcome(outcome).

(The helpfile is a bit misleading on this issue, but you see it in the examples).