[R] "split" argument in summary.aov?

Kaspar Pflugshaupt pflugshaupt at geobot.umnw.ethz.ch
Thu Dec 7 16:14:54 CET 2000


I have fitted a linear model containing one ordered factor with the "lm"
function, so R uses polynomial contrasts for it. When I view the summary,
the polynomial components of this factor are displayed. In the anova(...)
table, however, the factor just gets one line. In S-Plus (3.4 on Unix, I
looked up the manual), I can have the Sum of Squares split into the
polynomial components by using the "split=" argument to summary.aov(). In R
(as of V. 1.11), this feature seems to be missing.

Is this deliberate (are there reasons for the omission), or is it just not
(yet) implemented? If the latter is the case, does anybody have a formula to
calculate the split "by hand"? Or is there another R function for this
purpose that I overlooked?

Cheers & thanks

Kaspar Pflugshaupt


Kaspar Pflugshaupt
Geobotanisches Institut
Zuerichbergstr. 38
CH-8044 Zuerich

Tel. ++41 1 632 43 19
Fax  ++41 1 632 12 15

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