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Re: st: Rates using Poisson

From   Maarten buis <>
Subject   Re: st: Rates using Poisson
Date   Tue, 14 Aug 2007 01:55:40 +0100 (BST)

--- Sherry Lipsky <> wrote:
> Two questions:
> 1) I would like to calculate the age-specific and age-adjusted rates
> of hospitalizations among the exposed and unexposed in my
> population-based study using Poisson/Negative Binomial models...not
> just the IRR. Any ideas how to do this or even if it is possible?

Yes you can do that, the commands you are looking for are -adjust- and
-predict-. There is a subtle difference between the two that is
explained in (Buis 2007) for the -logit-, but the same principle
applies to -poisson- and -nbreg- 
M.L. Buis (2007), "predict and adjust with logistic regression", The
Stata Journal, 7(2), pp. 221-226. 
a pre-publication draft can be found at

Hope this helps,

Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434

+31 20 5986715

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