Lee,
A working, or in this case failing, example is necessary to detect what the
problem is.
This would include a statement loading the package that you use to run your
mlogit models; the latter is necessary because there are various packages
with functions that are called mlgoit.
Best, Ingmar

On Wed, Aug 1, 2012 at 3:05 PM, Lee van Cleef <l.van.cleef@gmx.net> wrote:

> Ingmar, many thanks. I get that one from R:
>
> Error in model.frame.default(terms(formula, lhs = lhs, rhs = rhs, data =
> data),  :
>   variable lengths differ (found for 'X')
>
> X is the variable I have used.
>
> Any comment would be much appreciated.
>
> Best regards!
>
>
>
>
> --
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>
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