Re: st: piece-wise logistic regression

[Michael Norman Mitchell <Michael.Norman.Mitchell@gmail.com>]

Dear Bruno

  Thanks very much for that suggestion, that is a great idea. In fact, 
google books has a preview by visiting

http://books.google.com/

and searching for Marsh and Cormier spline regression

  It looks like a very useful reference.

Thanks!


Michael N. Mitchell
See the Stata tidbit of the week at...
http://www.MichaelNormanMitchell.com

On 2010-04-29 12.57 AM, Bruno Schoumaker wrote:
> There is a nice little sage book (quantiative applications in the 
> social sciences) by Marsh and Cormier on spline regression.
> It notably explains how stepwise regression can be used to determine 
> the number of knots and their location. Not foolproof, but very useful 
> when no clear idea about the number and location of knots.
> Bruno
>
>
> Le 28/04/2010 9:09, Michael Norman Mitchell a écrit :
> > Dear Jason
> >
> >   I actually wrote that FAQ. You sure can use that exact same 
> > approach with a binary outcome. This technique is described using 
> > logistic regression in an article from the Stata Technical Bulletin, 
> > sg24, see
> >
> > http://www.stata.com/products/stb/journals/stb18.pdf
> >
> >   As the article describes, it is hard to determine the best place to 
> > select the "knot" (or as you call it, the kick), where the slope 
> > changes. Ideally, the "knot" would be selected based on theory or 
> > past evidence, but sometimes we do not live in an ideal world.
> >
> > I hope that helps,
> >
> > Michael N. Mitchell
> > See the Stata tidbit of the week at...
> > http://www.MichaelNormanMitchell.com
> >
> > On 2010-04-28 12.02 AM, Jason Ferris wrote:
> > > I have been reading on piecewise regression in stata from
> > > www.ats.ucla.edu/stat/stata/faq/piecewise.htm
> > >
> > > I am interested in approaching some analysis where the outcome is 
> > > binary
> > > and the predictor is continuous.  A lowess curve of the data seems to
> > > indicate a kick in my data with a positive slope between 1 and 10 and a
> > > negative slope from 10 to 80.
> > >
> > > Can I use the same approach mentioned in the website above for logistic
> > > piecewise regression?
> > >
> > > Jason
> > >
> > >
> > >
> > >
> > >
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