st: margins with MI

[Diane Robinson <robinson.oudekerk@gmail.com>]

I am using Stata version 13.1. I am attempting to get margins on a
multiply imputed database, using the helpful code from
http://www.ats.ucla.edu/stat/stata/faq/ologit_mi_marginsplot.htm. I am
using mlogit as I have an outcome variable with four categories.

This is the code I am using:
/*margins*/
version 13
program emargins, eclass properties(mi)
args outcome
mlogit outcomelim adj plan ch30 fam30 parch lenmo iplcat
c.ageatstart##c.ageatstart
margins, at(adj=(30(30)(180))) atmeans asbalanced
predict(outcome(`outcome')) post
end
forvalues i=1/4 {
mi estimate, cmdok: emargins `i'
}

I am getting this error:
invalid numlist
an error occurred when mi estimate executed emargins on m=1
r(121);

Any help or guidance will be much appreciated.
-- 
Diane Robinson
robinson.oudekerk@gmail.com
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