[R] output error in MatchIt

Ista Zahn istazahn at gmail.com
Tue Feb 25 16:22:49 CET 2014

It appears that average treatment effects are not calculated in the
version of Zelig currently on CRAN. Note that this is a Zelig issue,
not a MatchIt issue. See the "missing features" section of


On Mon, Feb 24, 2014 at 9:09 AM, Marwan Khawaja
<marwan.khawaja at gmail.com> wrote:
> Hello,
> I am trying to estimate average treatment effect in the MatchIt package
> (current R version on Windows), and ran the model exactly as in the
> documentation page 13, and got the following error massage,
> ate.all<-c(s.out61$qi$att.ev, -s.out62$qi$att.ev)Error in
> -s.out62$qi$att.ev : invalid argument to unary operator
> (s.out62 is similar to s.out2 in the example0
> Appreciate your help. Kindly respond to my private email - am not a
> subscriber to R help list at the moment.
> Thanks Marwan Khawaja
>         [[alternative HTML version deleted]]
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