Re: [R] Which function to use for multiple comparison?

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From: A.J. Rossini (rossini@blindglobe.net)
Date: Tue 09 Jul 2002 - 02:09:47 EST 

Message-id: <87r8ieurp0.fsf@jeeves.blindglobe.net>

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.

best,
-tony

>>>>> "thomas" == Thomas Lumley <tlumley@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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