[R] ordering boxplots according to median

[Andrew Robinson]

Willem,

use the "at=" argument, and feed it the rank of the medians

eg

require(MASS)
data(iris)
boxplot(iris$Sepal.Width ~ iris$Species)  #  Not ordered
boxplot(iris$Sepal.Width ~ iris$Species,
    at=rank(tapply(iris$Sepal.Width, iris$Species, median))) # Ordered

I hope that this helps,

Andrew

On Wed, Mar 22, 2006 at 09:59:09AM +0100, Talloen, Willem [PRDBE] wrote:
> Dear R-users,
> 
> Does anyone knows how I can order my serie of boxplots from lowest to
> highest median (which is much better for visualization purposes).
> 
> thanks in advance,
> willem
> 
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-- 
Andrew Robinson  
Department of Mathematics and Statistics            Tel: +61-3-8344-9763
University of Melbourne, VIC 3010 Australia         Fax: +61-3-8344-4599
Email: a.robinson at ms.unimelb.edu.au         http://www.ms.unimelb.edu.au