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.
glm(...,family="quasipoisson")?
It isn't. glm() does not need (and does not compute) the dispersion
parameter.
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, rip...@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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