[R] Extracting the dispersion parameter

[ripley@stats.ox.ac.uk]

On Sun, 23 Feb 2003, Edward F. Connor wrote:

> I have been unsuccessful in extracting the dispersion parameter in SPLUS 
> 6.1 using
> 
> summary or summary.glm(modelobj$dispersion)
> 
> from a glm object in which the family was set to quasi. This is the syntax 
> given in the manual. 

What is `the manual'?  If this is an accurate transcription then `the
manual' is incorrect.

> I want to write a script to bootstrap the estimate of 
> the dispersion parameter, but cannot seem to access that value.
> 
> Any suggestions?

Ask on S-news about S-PLUS questions!  You may have meant

summary(glmobject)$dispersion

but as glm is one area where S-PLUS and R differ considerably it does help 
to ask in the correct forum.

-- 
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