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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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