[R] boxplot grouped by two variables.

[Jonathan Rougier]

Hi Vadik,

On Tue, 21 Nov 2000, Vadik Kutsyy wrote:

> Is there a quick way to make boxplots groups by two variables?  By that 
> I mean, that if x axes have values ("A","B","C"), than at each value 
> there would be a few boxplots each for a value of second variable (say 
> ("1","2","3")).

If I understand you correctly you want to try the "interaction" function
in a boxplot.  Your data needs to be organised into a data.frame with
appropriate factors.  Here's a simple example ...

data(warpbreaks)
boxplot(breaks~interaction(wool, tension), data=warpbreaks, col=2:3)

Hope this helps, Jonathan.

Jonathan Rougier                       Science Laboratories
Department of Mathematical Sciences    South Road
University of Durham                   Durham DH1 3LE
http://www.maths.dur.ac.uk/stats/people/jcr/jcr.html


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