Statalist


[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

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


From   Richard Williams <Richard.A.Williams.5@ND.edu>
To   statalist@hsphsun2.harvard.edu
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
WWW: http://www.nd.edu/~rwilliam

*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/




© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index