r - Using calipers in GenMatch to enourage more pairs -


so following example matching package , in particular genmatch example

link package here

following example in genmatch

library(matching)

data(lalonde) attach(lalonde)  x = cbind(age, educ, black, hisp, married, nodegr, u74, u75, re75, re74)  balancemat <- cbind(age, educ, black, hisp, married, nodegr, u74, u75, re75, re74,                     i(re74*re75))  genout <- genmatch(tr=treat, x=x, balancematrix=balancemat, estimand="ate", m=1,                    pop.size=16, max.generations=10, wait.generations=1)  genout$matches genout$ecaliper  y=re78/1000  mout <- match(y=y, tr=treat, x=x, weight.matrix=genout) summary(mout)

we see 185 treated observation paired 270 non-treatment observation. want relax allow more flexible pairing on age criteria.

we can generate table teatment cases , age on left , control case , age on right by:

pairs <- data.frame(mout$index.treated, lalonde$age[mout$index.treated], mout$index.control, lalonde$age[mout$index.control])

now using caliper function of match() should able generate more relaxed match.

we see sd(lalonde$age) gives sd of 7 years our table, lets try , match limit. 1 simply

mout2 <- match(y=y, tr=treat, x=x, weight.matrix=genout, caliper=c(1,0,0,0,0,0,0,0,0,0)) summary(mout2)

it appear not because less matched number of observations have occured in mout2 mout1.

so have gone wrong? values of 0 must included in caliper or else error returned if blank

your first call genmatch did not impose any caliper. second call imposed caliper number of matches decrease. if want increase number of matches in first call, see "m" option. want 1-to-2 matching, etc.


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