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st: RE: prcomp
Leslie Clark writes:
> I have a few questions about the prcomp command. I have
> looked at the documentation and help file and have gotten a
> little confused. First, in the standard prcomp command
> WITHOUT invoking the tukey subcommand, what method of
> pairwise comparison is being used? Secondly, when tukey is
> invoked, which tukey method is being used for pairwise
> comparison: Tukey's hsd or wsd? Thanks very much for the help!
The documentation and output clearly indicate wsd for Tukey.
The default method is less clear (and may not have a formal name)
but is a set of 2-sided t-tests using s_ij = s * sqrt(1/n_i +1/n_j)
where s = sqrt(Mse) from a oneway Anova.
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