Multiple comparisons

Dear all:

Is there programs or packages to do multiple comparisons of means with
between and within subject design with R system?

The only facility for multiple comparisons in R that I'm aware of is in
package "ctest": pairwise.t.test, pairwise.wilcox.test and some more like
this (have a look at their help texts). They use the function p.adjust() (in
the base package), which uses the Hochberg adjustment by default.

I've used p.adjust() to adjust p values from multiple survival comparisons
"by hand", for which problem there seems to be no standard method. In your
case, there probably is (I do not know), so this approach would be
suboptimal. But it still might work.

Hope this helps some

Kaspar Pflugshaupt

Kaspar Pflugshaupt
Geobotanisches Institut
Zuerichbergstr. 38
CH-8044 Zuerich

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

mailto:pflugshaupt at geobot.umnw.ethz.ch
privat:pflugshaupt at mails.ch
http://www.geobot.umnw.ethz.ch

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