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Re: st: AW: GLM family and link (default)
From
Maarten buis <[email protected]>
To
[email protected]
Subject
Re: st: AW: GLM family and link (default)
Date
Mon, 14 Jun 2010 04:36:09 -0700 (PDT)
--- On Mon, 14/6/10, [email protected] wrote:
> I obtain these results with glm and probit commands:
<snip>
> probit newproc edu train skilled quality RD n5a
> rectech 12b obst_admin tax j30f environ if a4b==1
>
> note: outcome = edu < 0.75 predicts data
> perfectly except for edu == 0.75 subsample:
> edu dropped and 4 obs not used
>
> note: rectech != 0 predicts success perfectly
> rectech dropped and 7 obs not used
The problem is that some of your variables perfectly predict
you outcome. This makes it impossible to estimate the parameters
for those variables in a -logit- or -probit-. The natural solution
to that problem is to use -exlogistic- (see: -help exlogistic-).
Hope this helps,
Maarten
--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany
http://www.maartenbuis.nl
--------------------------
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