[R] extracting elements from summary(aov object)

[Thomas Lumley]

On Tue, 24 Sep 2002, Bill Shipley wrote:

> Hello.  When one types "summary(fit)", where fit is an object from a call
> to aov(), one gets an ANOVA table.  I want to save just one element of this
> summary.  How does one extract this?
>
> As an example, here is my output from a split plot ANOVA:
>
>  > summary(out)$"Error: soil.cores$block:soil.cores$treatment"
>                       Df  Sum Sq Mean Sq F value Pr(>F)
> soil.cores$block      3 0.63626 0.21209  1.0557 0.4147
> soil.cores$treatment  3 0.90276 0.30092  1.4978 0.2802
> Residuals             9 1.80813 0.20090
>
> I want to save only the F value of "soil.cores$treatment" .  In SPLUS one
> would do this by
> summary(out)$"Error: soil.cores$block:soil.cores$treatment"$"F value"[2]
> but this doesn't seem to work.
>

It turns out that
   summary(out)$"Error: soil.cores$block:soil.cores$treatment"
is actually a list containing one data frame rather than a data frame, so
something like

aovtable<-summary(out)$"Error: soil.cores$block:soil.cores$treatment"[[1]]
aovtable[2,"F value"]

would work.

	-thomas

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