H. Bromberger wrote:
Dear guRus,
I'm stuck and really would appreciate some help. I've already crawled the net...
I want to do some Boxplot which are sorted by the median and not alphabetically.
What I did so far:
x <- subset(mydata, Verwalt.Doku==1, select=c(1, 2))
P <- plot(x[,1], x[,2], plot=F)
???sort(P$stats[3,])???
bxp(P, col="yellow", las=1, horizontal=T, xlab="Potential")
Of course it sorts the vector P$stats[3,] but not the rest of the list. Thanks in advance, and sorry but I am new to R
Hubertus
Hi Hubertus,
To make sure bxp (or boxplot) uses the order you want, then the split variable must be ordered (see ?ordered). So order the split variable by median. E.g.,
R> set.seed(1)
R> z <- data.frame(x = rep(LETTERS[1:3], each = 6), y = rnorm(18))
R> tapply(z$y, z$x, median)
A B C
-0.22140524 0.53160520 -0.03056194
R> z$x <- with(z, ordered(x, levels(x)[order(tapply(y, x, median))]))
R> tapply(z$y, z$x, median)
A C B
-0.22140524 -0.03056194 0.53160520
R> boxplot(y ~ x, data = z)If you want the descending order, then see ?rev or put a minus sign in front of the tapply call.
HTH,
--sundar
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