st: estat mfx after asclogit: does not work with numeric alternatives

[Lisa Pfeiffer <lisapfeiffer@gmail.com>]

I am using the alternative specific constant command (asclogit) with a
dataset with a large number of alternatives that that are identified
numerically. I would like to use estat mfx to obtain the marginal
effects, but I get the error "1 invalid name". I have tried converting
the numbers to strings, but I get the same error. If I convert the
alternative names to letters, it works. Why can't estat mfx handle the
string/numeric alternative labels, and/or is there something that can
be done to fix it? Letter names are inconvenient because of the number
of alternatives.

Thanks,
Lisa Pfeiffer
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