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Re: st: mlogit problems


From   Richard Williams <Richard.A.Williams.5@ND.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: mlogit problems
Date   Sat, 29 Jul 2006 23:06:16 -0500

At 09:16 PM 7/29/2006, JOSHUA HAWLEY wrote:
Hello

I'm running a series of svy mlogit commands on different countries. I'm having some trouble producing the estimates with the expected groupings. In other words as part of the model I have five categories (call them A, B, C, D, E). When I run a tabulation on the dep var I get frequencies as I would expect, 2000 for one, 60 for another, you get the idea, and the important detail is there are valid cases in all five categories. However, when I run the mlogit commands I get a nonsense response back with regression output that seems to show the dep variable as one outcomes. In other words there is just one set of coefficents rather then the four I would expect.

I only get this response on selected datasets, and the same command language works fine on a number of nations.
It probably would help to see some commands and output. Also, remember that, just because a frequency shows cases in every category, that doesn't mean you'll have cases in every category when you do the mlogit, e.g. you could lose cases because of missing data on one or more of your independent variables.

In any event, I am betting it has something to do with your data rather than your commands, but without looking at the data, commands and output it is hard to say.


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Richard Williams, Notre Dame Dept of Sociology
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