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Re: st: linear probability model vs. probit/logit

From   Maarten buis <>
Subject   Re: st: linear probability model vs. probit/logit
Date   Tue, 3 Oct 2006 21:48:26 +0100 (BST)

At 03:04 PM 10/3/2006, Nishant Dass wrote:
> > does perfect prediction result in exclusion of those observations?

--- Richard Williams <> wrote: 
> Yes, but you should be getting a warning message about cases being 
> dropped if that is what is happening.  

I remembered that too, hence the link to the FAQ. But when I just now
repeated the example given in the FAQ, it did not drop any
observations. Anyhow, it is too late here in Europe to think clearly.
I'll think about it again in the morning.


*----begin example----
sysuse auto, clear
drop if foreign==0 & gear_ratio>3.1
logit foreign mpg weight gear_ratio
*----end example----

Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

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