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Re: st: RE: Rescaling


From   Cordula Stolberg <cs32@sussex.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: Rescaling
Date   Tue, 10 Aug 2004 09:37:33 +0100

Thanks to all of you for the useful advise on my questing regarding rescaling!

Cordula

--On 09 August 2004 18:35 +0100 Roger Newson <roger.newson@kcl.ac.uk> wrote:


At 18:25 09/08/2004, I wrote:

I think what Cordula really wants might be centring, rather than
scaling.  If you extract a constant X_0 from an X-variate before fitting
the  regression model, and therefore regress Y with respect to X-X_0,
then the  intercept will be the expected value of Y if X==X_0, instead
of the  expected value of Y if X==0.
Sorry, "extract" should of course be "subtract" here.

Roger

--
Roger Newson
Lecturer in Medical Statistics
Department of Public Health Sciences
King's College London
5th Floor, Capital House
42 Weston Street
London SE1 3QD
United Kingdom

Tel: 020 7848 6648 International +44 20 7848 6648
Fax: 020 7848 6620 International +44 20 7848 6620
   or 020 7848 6605 International +44 20 7848 6605
Email: roger.newson@kcl.ac.uk
Website: http://www.kcl-phs.org.uk/rogernewson

Opinions expressed are those of the author, not the institution.

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