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Re: st: RE: mlogit problem with "predict"

From   Richard Williams <>
Subject   Re: st: RE: mlogit problem with "predict"
Date   Tue, 07 Aug 2007 12:20:39 -0500

At 10:04 AM 8/7/2007, Sheela Athreya wrote:
The idea that maybe I have an (almost) perfect prediction occurred to
me too, but I don't know how to investigate it. Perhaps there is an
equivalent test to -tab tax pc- that allows me to look at
quantitative variables for anything that is off?
You could try something like

bysort y: sum x1 x2 x3 .

Look for x's with little or no variability within a category of y. Or, maybe try

bysort y: corr x1 x2 x3

and see if there is extreme multicollinearity within a category of y.

Richard Williams, Notre Dame Dept of Sociology
OFFICE: (574)631-6668, (574)631-6463
HOME: (574)289-5227
EMAIL: Richard.A.Williams.5@ND.Edu

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