[R] Two-way tables of data, etc

Murray Jorgensen maj at waikato.ac.nz
Wed Sep 5 07:47:50 CEST 2001

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

> xtabs
> {base}                                                                   
>            R Documentation
> Cross Tabulation
> Description
> Create a contingency table from cross-classifying factors, usually contained
> in a data frame, using a formula interface. 

and I normally expect a contingency table to contain counts.

Dr Murray Jorgensen      http://www.stats.waikato.ac.nz/Staff/maj.html 
Department of Statistics, University of Waikato, Hamilton, New Zealand 
Email: maj at waikato.ac.nz                            Fax +64-7 838 4155
Phone +64-7 838 4773 home phone +64-7 856 6705  Mobile +64-21 139 5862

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