[R] computation of dispersion parameter in quasi-poisson glm
Prof Brian Ripley
ripley at stats.ox.ac.uk
Fri Apr 9 14:49:01 CEST 2010
On Fri, 9 Apr 2010, Sven Garbade wrote:
> Hi list,
> can anybody point me to the trick how glm is computing the dispersion
> parameter in quasi-poisson regression, eg.
It isn't. glm() does not need (and does not compute) the dispersion
summary.glm will ... list it and the code is in the top few lines.
There is no 'trick': this is as described in MASS pp 186, 208 (which
also explains some of the pitfalls).
> Thanks ®ards, Sven
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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