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st: RE: Percent correctly predicted after oprobit


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Percent correctly predicted after oprobit
Date   Mon, 14 Feb 2005 15:53:03 -0000

In the case of -logit- and -lstat-, choosing 
to divide predicted probabilities at p = 0.5
is a little arbitrary, but appealing on 
symmetry grounds. 

Can you say what people do, or what would
you justify, for reducing predictions from
-oprobit- to integer categories? Any 
notion of percent correct seems a bit more 
elusive in the ordinal case. Why not 
just -predict, xb- and calculate a
concordance correlation? Or even 
draw a graph? 

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

Patricia Sourdin

> can anyone help me to calculate percent correctly predicted 
> after oprobit.  I
> guess what I'd like is something like -lstat-.  I'm currently 
> overseas and all
> my Stata manuals are at home!

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