Date: Wed, 22 Sep 2010 05:52:18 -0700
Reply-To: Bruce Weaver <bruce.weaver@hotmail.com>
Sender: "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From: Bruce Weaver <bruce.weaver@hotmail.com>
Subject: Re: Using a segmented linear regression to find a transition point
In-Reply-To: <4C99B199.E287.0045.0@upstate.edu>
Content-Type: text/plain; charset=us-ascii
Moshe Marko wrote:
>
> Hi,
>
> I would like to run a piecewise regression and a logistic regression
> models
> where the goal is to find the transition point where the association
> between
> the dependent and the independent variables change (i.e. adding a change
> point c) - any ideas for the correct syntax?
>
> Thanks
>
> Moshe
>
>
This should help for the piecewise linear regression model:
http://www.spsstools.net/Syntax/RegressionRepeatedMeasure/PiecewiseRegression.txt
For the case where the knot points are known, the same methods described
there could be applied to logistic regression, I should think. But I'm not
aware of a method for using the data to estimate the knot points for
logistic regression. I guess I'd start by seeing if I could cajole NLR into
running an ordinary binary logistic regression model first. If that can be
done, then you should be able to get it to determine the knot points for you
too.
HTH.
-----
--
Bruce Weaver
bweaver@lakeheadu.ca
http://sites.google.com/a/lakeheadu.ca/bweaver/
"When all else fails, RTFM."
NOTE: My Hotmail account is not monitored regularly.
To send me an e-mail, please use the address shown above.
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