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RE: AW: st: maximum number of outcomes in mlogit


From   Richard Williams <Richard.A.Williams.5@ND.edu>
To   statalist@hsphsun2.harvard.edu, <statalist@hsphsun2.harvard.edu>
Subject   RE: AW: st: maximum number of outcomes in mlogit
Date   Wed, 21 May 2008 07:26:14 -0500

At 05:38 AM 5/21/2008, Nick Cox wrote:
I have no inside knowledge on this detail, but it wouldn't surprise me
if that limit was based on simulations showing how far -mlogit- can
deliver credible and intelligible results in reasonable time. StataCorp
would want to protect users, and themselves, from results that were not
defensible. That is the sort of thing they do a lot of.
It may also be protecting the user in that a Y with more than 50 categories may have been specified by mistake, e.g. the user accidentally specified a continuous var rather than a categorical one. I added limits to my own user-written programs precisely because a few people had made such mistakes.

Perhaps some sort of override option, e.g. maxcat(60), could be added in a future release of Stata.


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Richard Williams, Notre Dame Dept of Sociology
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