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[S] Graphical display of multiple comparisons

To: "'s-news@wubios.wustl.edu'" <s-news@wubios.wustl.edu>
Subject: [S] Graphical display of multiple comparisons
From: "Wright, Kevin" <WRIGHTKEVI@phibred.com>
Date: Wed, 22 Sep 1999 17:28:48 -0500
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I'm looking for ways to display information about many multiple comparisons
in a compact form.

I know how to plot confidence intervals for multiple comparisons, for
example

>  mc<-multicomp(...)
>  plot(mc)

With 20 treatments, this will produce about 10 pages of plots of confidence
intervals.  

I'm interested in other ways to display and interpret this data.  A couple
of ideas:

1.  Display the treatment means along a number line and use underscores to
group non-significant means.  For example:

---A--B----C-D
   ----    ---
      --------

2. Create a matrix with cell entries that are the estimates of the
difference in means.  Use a special character to denote estimates that are
significantly nonzero.  For example:

  A   B   C   D
A     3   8*  10*
B         5   7
C             2


Does anybody know of S+ functions that will perform tasks like this?


Kevin Wright, Pioneer Hi-Bred Int'l 
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