[R] Calculating dispersion in glm

Thomas Lumley tlumley at u.washington.edu
Fri Aug 23 00:29:38 CEST 2002

On Fri, 23 Aug 2002, David Mackie wrote:

> Hi all,
> How is dispersion calculated within the glm function in R ?

It isn't.

It's calculated within the summary.glm function (or supplied by the user).
 sum(object$weights * object$residuals^2)/df.r

which works out to be equal to the mean square of the Pearson residuals.


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