[R] Problem with matchit() and zelig()

F.Giammarino at lse.ac.uk F.Giammarino at lse.ac.uk
Tue Jan 25 14:38:28 CET 2011

Dear all,

Does anybody know why the following code returns an error message?

+re74+re75, method="full", data=lalonde)
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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