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Re: st: oprobit cut points . . .sorry


From   Owen Haaga <ohaaga@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: oprobit cut points . . .sorry
Date   Thu, 21 Aug 2003 13:19:36 -0700 (PDT)

It turns out that what I thought were constraints in
the model were actually normalizations performed after
estimation.  So my original question doesn't make any
sense.  Sorry for the confusing post.

Owen

--- Owen Haaga <ohaaga@yahoo.com> wrote:
> Dear Statalisters,
> I am trying to write a program which generalizes the
> censored ordered probit model (inspired by Edoardo
> Masset's earlier post).  Can anyone tell me how the
> cutpoints on the regular oprobit are constrained?  I
> have seen the ordered probit model used with either
> the first or the "middle" cutpoint constrained to be
> zero.  I am currently constraining the cutpoints to
> be
> centered around zero (ie. the lowest cutpoint is -1
> times the highest cutpoint), but I would like to be
> able to use the results from a regular oprobit as
> the
> intial values for my model.  I can rescale the cut
> points from oprobit's e(b) to center around zero
> (maintaining them the same "probability" apart), but
> I'm still working on rescaling the coefficients.  It
> would be a lot easier if I knew how the cutpoints in
> the oprobit were constrained originally, and maybe
> in
> that case I could use the same method in my own ml
> estimation, for consistency.
> Any advice would be greatly appreciated.  I'm afraid
> I
> can't make head or tail of the built-in ado files
> for
> oprobit.
> 
> Thank you,
> Owen 
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