Hi, Graham, Thank you for sharing this.

I encountered the same problem. My choice set was unbalanced because some
alternatives were not available for some observations. If I forced the
choice sets balanced, model estimation results would be biased. However,
after including chid.var = "" and alt.var="" in the script, the model
worked fined, with unbalanced choice set.

Gary



On Mon, Apr 8, 2013 at 1:13 AM, Leask, Graham <g.leask@aston.ac.uk> wrote:

> Dear Listmembers
>
> Thank you for your help in resolving the duplicate row.names error. The
> solution was very straightforward to ensure that the choice set is
> completely balanced. Once that was achieved the program worked fine.
>
> Kind Regards
>
>
> Graham
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