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Re: st: St: logistic regression query


From   David Hoaglin <[email protected]>
To   [email protected]
Subject   Re: st: St: logistic regression query
Date   Fri, 30 Aug 2013 22:20:07 -0400

Hi, Ron.

It pays to be cautious with prediction near the ends of a variable's
range (and, especially, with extrapolation beyond the range of the
data).

How far are those ages (70 and 80) from the other ages in the data?

What is the age of the youngest persons?

What function of age are you fitting?

David Hoaglin

On Fri, Aug 30, 2013 at 5:04 PM, Ronald McDowell
<[email protected]> wrote:
> Hello list members
>
> This is a basic query on logistic regression.
> I'm modelling the log(odds) of success as a function of age.
> The oldest person in the success group (numerator) is 80 years old.
> The oldest person in the reference group (denominator, no success) is 70 years old.
> Is it appropriate to report fitted values (odds of success) up to 70 or 80 years of age?
>
> Thanks
> Ron
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