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Re: st: Sample size calculation under poisson distribution

From   Ronan Conroy <>
To   "" <>
Subject   Re: st: Sample size calculation under poisson distribution
Date   Wed, 9 Feb 2011 09:52:27 +0000

On 8 Feb 2011, at 12:18, Munyaradzi Dimairo wrote:

> Hi Folks
> I'm carrying out a sample size calculation for a clinical trial under the
> poisson model. Parameter of interest is the mean rate ratio and i am just
> wondering if there is a stata user written command to do this in STATA 11?

The calculation is very easy by hand, and is documented in Van Belle in a freely available chapter from his fascinating book "Statistical Rules of Thumb" 

Have a look at section 2.7.

Ronán Conroy
Associate Professor
Division of Population Health Sciences
Royal College of Surgeons in Ireland
Beaux Lane House
Dublin 2

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