Extracting the dispersion parameter in a GLM output

Question

From here, a svyglm model's summary includes a line like

(Dispersion parameter for gaussian family taken to be 28.35031)

If my linear model object is my_lm, how do I extract its dispersion parameter? Something like my_lm$dispersion. I am trying to extract this value as a variable, not just print it.

Answer 1

You can do:

fit2 <- glm( Sepal.Length ~ ., data=iris )
summary(fit2)$dispersion
[1] 0.09414226

Notice that the dispersion is in the summary object and not in the model object