在GenMatch中使用卡尺鼓励更多对 [英] Using calipers in GenMatch to enourage more pairs

问题描述

因此，请遵循Matching软件包中的示例，尤其是GenMatch示例

So following the example from the Matching package and in particular the GenMatch example

链接到此处的软件包

按照GenMatch

图书馆(匹配)

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)

我们看到185个治疗观察与270个非治疗观察配对. 现在，我们希望放宽此限制，以便根据年龄标准更灵活地配对.

We see 185 treated observation are paired with 270 non-treatment observation. Now we want to relax this to allow for more flexible pairing on the age criteria.

我们可以通过以下方式生成表格，其中奶头案例及其年龄在左侧，对照案例和年龄在以下范围内:

We can generate a table with the teatment cases and their age on the left and the control case and age on the right by:

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

现在，使用Match()的caliper功能，我们应该能够生成更轻松的匹配.

Now using the caliper function of the Match() we should be able to generate a more relaxed match.

我们看到sd(lalonde$age)为我们的表提供了7年的SD，因此请尝试匹配此限制.一个简单地

We see that sd(lalonde$age) gives us a SD of 7 years for our table, so lets try and match for this limit. Would one 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)

它的出现并不是因为mout2中出现的Matched number of observations少于mout1.

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

那我哪里出问题了? 值必须包含在卡尺中，否则，如果它们为空，则返回错误

So where have I gone wrong? The values of zero must be included in caliper or else an error is returned if they are blank

推荐答案

您对GenMatch的首次调用没有施加 any 卡尺.您的第二个电话强加了卡尺，因此比赛次数将减少.如果您想增加首次通话的匹配次数，请参见"M"选项.您可能想要像一对一匹配之类的东西.

Your first call to GenMatch did not impose any caliper. Your second call imposed a caliper so the number of matches will decrease. If you want to increase the number of matches in your first call, see the "M" option. You probably want something like 1-to-2 matching, etc.

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