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Re: st: gologit2 model


From   Richard Williams <richardwilliams.ndu@gmail.com>
To   statalist@hsphsun2.harvard.edu, statalist@hsphsun2.harvard.edu
Subject   Re: st: gologit2 model
Date   Wed, 13 Oct 2010 13:24:41 -0500

At 12:14 PM 10/13/2010, Maarten buis wrote:
--- On Wed, 13/10/10, Nilam Prasai wrote:
> I am trying to estimate a generalized ordinal logistic
> model by using gologit2 program in stata. I have approximately 40
> observations for which predicted probability is negative. Should I be
> concernde. My sample size is 115.

Sounds like too many negative predictions to me. Rich Williams, the
author of -gologit2-, maintains an FAQ which has an entry on negative
predicted probabilities and a possible solution:
<http://www.nd.edu/~rwilliam/gologit2/tsfaq.html>

I agree with Maarten. See the FAQ. You may be able to tweak the data or the model. However, 115 is a pretty small N for any maximum likelihood analysis, let alone one that estimates as many parameters as gologit2. You can also see the main support page at

http://www.nd.edu/~rwilliam/gologit2/index.html


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Richard Williams, Notre Dame Dept of Sociology
OFFICE: (574)631-6668, (574)631-6463
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