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RE: st: probit mean


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: probit mean
Date   Mon, 13 Nov 2006 18:06:08 -0000

I'll say what at least some others may be thinking. 
If you want elaboration of the cryptic comments 
of an unnamed academic, isn't there one obvious person
to ask?  

Nick 
n.j.cox@durham.ac.uk 

Marcello Pagano
 
> I don't know about what was meant by the first part, but the 
> second part 
> "My colleague estimates a probit model and then puts mean projections 
> into the explanatory variables..." is a silly way to proceed.  Think 
> about it.  You would be finding the probability for the "average" 
> person, i.e. one with a gender of  0.46, for example.  It is 
> far better 
> to average out the probabilities.
 
Dirk Nachbar wrote:

> > A colleague received a reply from an academic saying " 
> Remember that 
> > the probit does not predict at the mean and an adjustment 
> needs to be 
> > made for this." Unfortunately I couldn't tell him what she meant by 
> > that. My colleague estimates a probit model and then puts mean 
> > projections into the explanatory variables to predict a dependent 
> > probability.
> >
> > Does any of you know what the academic meant by that?

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