[R] Two-way tables of data, etc

[Prof Brian D Ripley]

On Wed, 5 Sep 2001, Murray Jorgensen wrote:

> At 06:42 AM 5-09-01 +0100, Prof Brian D Ripley wrote:
>
> >xtabs(content ~ block + treat)
> >
> >is almost what you gave, better labelled.
> >
> >The obvious (to me) tools are xtabs and ftable to flatten arrays.
>
> Yes, excellent. Thank you.
>
> The beginning of the xtabs documentation is a little misleading, though, as it
> runs

Rather, I am mis-using the tool, as I happen to know it does this
(or rather that crosstabs in S-PLUS can be so abused).

Kurt: might it be worth adding an example, e.g.

> data(warpbreaks)
> warpbreaks$replicate <- rep(1:9, len=54)
> ftable(xtabs(breaks ~ wool + tension + replicate, data = warpbreaks))

or maybe

ftable(xtabs(breaks ~ wool + replicate + tension, data = warpbreaks))

or even

tab <- xtabs(breaks ~ wool + replicate + tension, data = warpbreaks)
dimnames(tab)[[2]] <- rep("", 9)
names(dimnames(tab))[2] <- ""
ftable(tab)


-- 
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

-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !)  To: r-help-request at stat.math.ethz.ch
_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._