[R] Which function to use for multiple comparison?

A.J. Rossini rossini at blindglobe.net
Mon Jul 8 18:09:47 CEST 2002

There is also the new "multicomp" package (as well as "multtest" in
Bioconductor); the latter, though, is probably more appropriate for
the "many t-tests" style problems.  I've not had a chance to look at
the former.


>>>>> "thomas" == Thomas Lumley <tlumley at u.washington.edu> writes:

    thomas> On Mon, 8 Jul 2002, Julie Cong wrote:
    >> [Moderator: This was erronously sent to R-announce,
    >> and filtered fortunately ]
    >> Hi,
    >> This is my first time to use R. I'm wondering which function I can use to do
    >> multiple comparison. I have an lm object and want to do multiple comparison
    >> based on this object. Splus has a function multicomp() but I could not find
    >> a similar one in R. Thanks in advance. Really appreciate it.

    thomas> At the moment the multiple comparisons features in R are a bit limited.

    thomas>    p.adjust does a number of corrections of p-values that are very general

    thomas>    pairwise.t.test is another interface to these same methods

    thomas>    TukeyHSD provides Tukey's Honestly Significant Difference

    thomas> help.search("comparison") suggests that the npmc package might also be
    thomas> helpful.

    thomas> 	-thomas

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A.J. Rossini				Rsrch. Asst. Prof. of Biostatistics
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