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From | Sheela Athreya <athreya@neo.tamu.edu> |
To | statalist@hsphsun2.harvard.edu |
Subject | st: RE: mlogit problem with "predict" |
Date | Fri, 10 Aug 2007 10:24:18 -0500 |
Hello,
I am using Stata 9 for the PC, and have run the following command:
mlogit tax pc1 pc2 pc3 pc4, vce(jackknife)
Where (tax) has five outcomes
The regression results seem to be fine, but when I then try to run "predict p1 p2 p3 p4 p5" to obtain posterior probabilities, I get the following:
"p1: 27 missing values generated" (note: there are more than 27 cases in the data set)
And the resulting posterior probabilities are completely off-- every value of p1 is either 0, 1 or missing (".")
And, for a handful of cases, the values of p1-p5 are *all* 0.
This also happens when I do not use the vce(jackknife) command, and when I use three instead of four independent variables.
I suspect something is wrong among my cases (or variables) such that maybe two of my groups are so highly correlated that I am getting these results? But I am not familiar enough with the principles of multinomial logit to know. Any help or advice would be much appreciated.
Many thanks,
*******************************
Sheela Athreya, Ph.D.
Texas A&M University
4352 TAMU
College Station, TX 77843
phone: 1-979-845-4785
fax: 1-979-845-4070
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