Re: st: piece-wise logistic regression

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

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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