[R] boxplot grouped by two variables.

[Vadik Kutsyy]

>> 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.

Thanks, it works.  Now fowlup question, I created addition level, in 
order to have extra space between groups.  Is there a nicer way to do it?

Thanks.

-- 
Vadim Kutsyy
http://www.kutsyy.com                     vadim at kutsyy.com
The University of Michigan - Ann Arbor         PhD Student

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