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Re: st: use of fracpoly with Proportional Odds model?


From   "Rodrigo A. Alfaro" <ralfaro76@hotmail.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   Re: st: use of fracpoly with Proportional Odds model?
Date   Wed, 5 Jul 2006 17:56:47 -0400

Stephan,

Richard suggests to make a copy of frac_chk.ado. Use which
to find it. For example in this pc:

  which frac_chk
C:\Stata8\ado\base\f\frac_chk.ado

Make a copy (for example in your ado folder) typing

  copy C:\Stata8\ado\base\f\frac_chk.ado C:\ado\frac_chk2.ado

Modify frac_chk2.ado (using notepad or any text-editor).

The problem is how!! Specifically what distributions will be
asociated with ologit? Experts should know the answer.

Rodrigo.


----- Original Message -----
From: "Richard Williams" <Richard.A.Williams.5@ND.edu>
At 06:12 AM 7/5/2006, Stephan Rudolfer wrote:
>I am fitting PO models to ordinal categorical data, and wish to
>apply fractional polynomials to the continuous covariates.  However,
>fracpoly does not allow ologit as the regression command.
>
>Is there a work-around? Or some other way of achieving my aim?
>
>Many thanks in advance for any assistance with this.
>--

The list of "blessed" programs is contained in

frac_chk.ado

I don't know why ologit is not on the list, e.g. is it sound
statistical practice to exclude it or did nobody ever get around to
programming it?  I also don't know what good or bad things would
happen if you created a modified program where ologit was among the
blessed, but I suppose you could try it.  Just don't zap the originals.
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