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Re: st: Confidence interval for incidence rate


From   Roger Newson <roger.newson@kcl.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Confidence interval for incidence rate
Date   Tue, 29 Jul 2003 09:36:31 +0100

At 22:57 28/07/03 +0100, Paul O'Brien wrote:
I can find confidence intervals for incidence rate ratio and difference but
not a simple incidence rate.
One possibility is to use the -noconst- option with -poisson- and to use a dummy variate of ones. If you type

gene byte baseline=1
poisson y baseline,robust noconst irr

then the parameter estimated (named -baseline-) should be a baseline incidence rate. And if you type

gene byte baseline=1
poisson y x baseline,robust noconst irr

then the parameter -baseline- will be a baseline incidence rate for zero -x-, and the parameter -x- will be an exponential rate of increase per unit of -x-.

I hope this helps.

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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