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Re: st: AW: GLM family and link (default)


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: AW: GLM family and link (default)
Date   Mon, 14 Jun 2010 04:36:09 -0700 (PDT)

--- On Mon, 14/6/10, mmolina@uniroma3.it 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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