[R]: Experimental Design

Prof Brian D Ripley ripley at stats.ox.ac.uk
Thu Apr 13 13:12:43 CEST 2000

On Thu, 13 Apr 2000, Ko-Kang Wang wrote:

> Hi to all R lovers,
> I am thinking of investigating and perhaps improve the anova "aov"
> function in R.  However before I do so I just like to see if anyone
> knows whether R is capable of multiple comparison tests (eg "Standard
> Difference of the Means, SED", "Fisher's Least Significant Difference"
> ...etc)?  If it is, how can I do it?

Look in NEWS

    o   Some simple multiple comparison procedures: p.adjust() for
        generic adjustment of a set of p values by variants of the
        Bonferroni method; pairwise.t.test, pairwise.wilcox.test,
        pairwise.prop.test for pairwise comparisons of grouped data
        and proportions.

so R has some.  S-PLUS has multicomp, and people do ask for it here.

However, what is the connection with the aov() function?  That calculates
sums of squares in multistratum experimental designs.  You seem to be
wanting different ways to process an object of class aov, not to improve
aov().  Be aware that aov() was written to be compatible with S-PLUS, and
we will want to keep that compatibility.  But with those caveats, please do
contribute code.

Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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