Or with package ggplot2 :

library(ggplot2)

c <- qplot(cyl, mpg, data=mtcars)

c + geom_boxplot(aes(group = factor(cyl))) +
  stat_summary(fun = median, geom = "line", colour = "red") +
  stat_summary(fun = function(x) min(x), geom = "line", colour = "blue") +
  stat_summary(fun = function(x) max(x), geom = "line", colour = "green")


2009/1/11 johnhj <jharris@web.de>

>
> Hii,
>
> I created some boxplots with this commands:
>
> x <-read.table(file="test.txt")
> x$group <- rep(1:8, each=5)
> boxplot(V3~gruppe, data=x)
>
> Now, I will connect the boxplots to each other to the min, max and median
> values.
> Can anybody help me how to do it ?
>
> greetings,
> J
> --
> View this message in context:
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>
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