Re: [R] glm(quasipoisson) with non-integer response

From: Prof Brian Ripley <>
Date: Fri, 18 Apr 2008 07:53:01 +0100 (BST)

On Thu, 17 Apr 2008, Mark wrote:

> Hi,
> I have count data that have been meddled with enough to make them non
> integers. Using glm(poisson) returns a "non integer" error but
> glm(quasipoisson) does not. Just wondering if anyone knows if I am
> violating the assumptions of a quasipoisson error structure by using
> these non-integer response data?

No, it just assumes variance \propto mean.

> Thanks! I'd welcome your thoughts and/or references...

The help page gives the references ....

Brian D. Ripley,        
Professor of Applied Statistics,
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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Received on Fri 18 Apr 2008 - 07:33:10 GMT

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