[R] GenMatch providing different results

Rob Wood robert.wood at adelphigroup.com
Tue Dec 16 17:04:45 CET 2014

Hi there,

I'm performing some propensity score matching in R, where I am using
GenMatch() to generate a weight matrix for the covariates, before plugging
that into Match(). However, I keep on getting different results each time I
run the code. I'm using int.seed and unif.seed in GenMatch, but to no avail.
I've also noticed that when I just use Match() without previously using
GenMatch(), the results are consistent each time, which is why I believe
GenMatch() is causing the problem:

A slight extract of my code looks like this:

######Genetic Matching
gmatch <- GenMatch(Tr=treatment, X=X, estimand="ATT", M=1, pop.size=50,
max.generations=15, wait.generations=5, caliper=0.05, ties=FALSE,
int.seed=240690, unif.seed=021189)
###Actual matching
 match <- Match(Y=outcome, Tr=treatment, X=X, estimand="ATT",


Can anyone point me in the right direction to diagnose my problem?



View this message in context: http://r.789695.n4.nabble.com/GenMatch-providing-different-results-tp4700836.html
Sent from the R help mailing list archive at Nabble.com.

More information about the R-help mailing list