I'm having some trouble getting Zelig to simulate parameters from chopit
model estimates.
Zelig will reproduce the model estimates:
z.out <- zelig(f1, data = list(self = pmra, vign =
pmra), model =
"chopit")
and set the parameters to their default values:
x.out <- setx(z.out, data = pmra)
but when I try to run the simulations using the following code:
s.out <- sim(z.out, x = x.out)
I get this error message:
Error in UseMethod("vcov") : no applicable method for "vcov"
Any suggestions? Thanks.
--
Justin Marlowe
jmarlowe(a)washington.edu
Assistant Professor
Daniel J. Evans School of Public Affairs
Box 353055
Seattle, WA 98195-3055
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