[R] ANOVA f-test

Prof Brian D Ripley ripley at stats.ox.ac.uk
Mon Mar 8 00:02:44 CET 1999

On 7 Mar 1999, Peter Dalgaard BSA wrote:

> Prof Brian D Ripley <ripley at stats.ox.ac.uk> writes:
> > > Secondly, how can do a second evaluation using a multiple ANOVA compare using
> > > Tukey's procedure?
> > 
> > Eh?  That could mean several things. If you mean Tukey's method of multiple
> > comparisons, it is not currently available in R. (It is in recent versions
> > of S-PLUS.)  [John Tukey is one of the most prolific of statisticians ever:
> > "Tukey's procedure" is not at all precise.]
> To be fair, once we're talking multiple comparisons, there's hardly
> more than one. We don't have the procedure as such, but we do have the

People write whole books about this, and I think Tukey has at least
two procedures. S-PLUS manages to find about 8, as does Yandell's book. If
I had thought it was that easy I would have added it to aov, but I didn't
and still don't. Even specifying which comparisons are to be considered
is non-trivial, I believe.

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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