PS Matching R plug-in

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PS Matching R plug-in

Salbod
I installed a R plug-in called PS Matching. I'm trying to match a treated group (n = 60) with a comparison group (n = 600) on eight covariates (c1 TO c8). I want to match each treated unit with a comparison unit. I hoping to get a sample of around 120.  Does anyone know how to do that with this plug-in? Or a solution to the k2k function in the CEM  R package? This is one of the package that PS Matching is based on.

Any suggestions are most welcomed.

TIA, Stephen Salbod, Pace University, NYC