Dear all,
Does anybody know why the following code returns an error message?
>library(MatchIt)
>library(Zelig)
>data(lalonde)
>
>m.out1<-matchit(treat~age+educ+black+hispan+nodegree+married
+re74+re75, method="full", data=lalonde)>
>z.out1<-zelig(re78~age+educ+black+hispan+nodegree+married+re74+re75,
data=match.data(m.out1, "control"), model="ls" ,
weights="weights" )>
>x.out1<-setx(z.out1, data=match.data(m.out1, "treat"), cond=T )
>
>s.out1<-sim(z.out1, x=x.out1)
>
Error in model.frame.default(formula = re78 ~ age + educ + black +
hispan + :
variable lengths differ (found for '(weights)')
I noticed that the problem disappears if either the option
weights="weights" in the zelig() function or the option cond=T in the
setx() function is removed.
Is there a conflict between the options weights="weights" in zelig()
and
cond=T in setx()/sim()?
Or is there an inconsistency in my syntax?
Any suggestion would be very much appreciated.
Best wishes,
Flavia Giammarino
London School of Economics, UK
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