Date: Fri, 25 Oct 2002 17:50:15 -0500
Reply-To: "Simon, Steve, PhD" <firstname.lastname@example.org>
Sender: "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From: "Simon, Steve, PhD" <email@example.com>
Subject: Re: combining Logistic and Linear Models
Sherry Downing-Alfonso writes:
> I am working on a model to predict a measure which is
> present only for about 2% of the population I am
> evaluating. I've taken those 2%, as well as a
> representative sample of similar size from the remaining
> 98%, and analyzed using logisitic regression (event, y/n).
> Next, working with the group for which the event is present
> and using linear regression to predict the measure of
> interest. How can I combine these 2 models?
I'm not sure you need to combine them. Just report the two models as they
currently stand. If you do want to combine them, you need to use something
like a Tobit regression which is a rather specialized approach not available
Steve Simon, firstname.lastname@example.org, Standard Disclaimer.
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