[R] inspect s4 methods

Douglas Bates bates at stat.wisc.edu
Fri Oct 23 04:02:31 CEST 2009

On Thu, Oct 22, 2009 at 8:11 PM, Ista Zahn <izahn at psych.rochester.edu> wrote:
> Hi everyone,
> I'm sure this has been asked before, but I could not find the right
> search terms to find it.
> If I want to see what summarizing a model fit with lm() does, I can
> write "summary.lm". But what if I want to see what summarizing a model
> fit with lmer() (lme4 package) does?
> showMethods(summary)
> Function: summary (package base)
> object="ANY"
> object="character"
>    (inherited from: object="ANY")
> object="mer"
> object="sparseMatrix"
> object="summary.mer"
> tells me there is a "mer" method, but  "summary.mer" gives me no joy.
> How can I see what summary.mer does? Do I have to inspect the source
> code?

Actually if you had followed up with the documentation for showMethods
you would have found out.

showMethods(summary, class = "mer", include = TRUE)

More details are given in Uwe's article in issue 4 of 2006 R News

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