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Re: st: x predicts failure perfectly?

From   Richard J Stoll <[email protected]>
To   Stata listserv <[email protected]>
Subject   Re: st: x predicts failure perfectly?
Date   Mon, 5 Apr 2004 14:10:07 -0500 (CDT)

On Mon, 5 Apr 2004, Petersen, Karen  wrote:

> I have run into a perplexing problem.  I am using logit to analyze an outcome
> variable (mid)
> logit mid illibdem1 limdyn1 absdyn1 auth1 pers1 cwpceyrs_werner rel_cap
> econ_dep1 econ_dep2 rel_energy allies if cat2_2==11 & exclude2==0 &
> initiate~=2, cluster(dyad_id)
> and get the following message about one of my explanatory variables (absdyn1):
> note: absdyn1 != 0 predicts failure perfectly
>       absdyn dropped and 68 obs not used
> Does anyone know why I get the above error message when the variable does not
> appear to actually be a "perfect predictor"?
I suspect that it is a perfect predictor in the logit because you are
losing cases due to misssing data on the other variables in the equation.
Richard J. Stoll, Professor of Political Science and
Associate Dean of Social Sciences * Rice University
Dept. Political Science MS 24 * P.O. Box 1892 * Houston TX 77251-1892
E-mail: [email protected] * Tel: 713-348-3362 * FAX: 713-348-5273

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