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

Prof Brian Ripley ripley at stats.ox.ac.uk
Fri Apr 18 08:53:01 CEST 2008

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,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
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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