st: Mixlogit Error

[Cameron McLoughlin <cameron.mcloughlin@gmail.com>]

Dear Statlisters,

I have a question regarding the correct use of the user written
command mixlogit.

I have a monthly panel of 27 countries over 7 years and am trying to
estimate a mixed logit model with a crisis dummy (0/1) as the
dependent variable.  My data is stacked in the usual STATA format, for
example:


Id    Time           Cisis   Var1   Var2

1    1994m1        0
1    1994m2        1
1    1994m3        0


Following previous advice on this forum available in other FAQs
regarding mixed logit, I first made sure that I can estimate a clogit
model using this data.  I have no problems using for example with the
command:

clogit crisis var1 var2, group(id) vce(cluster id)

After reading Arne Hole's STATA Journal article on the mixed logit
command, I thought that the way I should code this command should be:

mixlogit crisis, rand(var1 var2) group(time) id(id)

When I try this piece of code though, I receive the error message 'at
least one group has more than one chosen alternative'.

Any ideas as to what I am doing wrong?  I guess that I am not
specifying the group() option i.e. the choice sets correctly, but I'm
still strugglin with how to specify this option.....

Thanks alot for any suggestions you may have!!!
Cameron McLoughlin
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