Sibylle -
Since you didn't give a reproducible example, I'll try
to make one that will illustrate what you need to know to
answer your question.
Suppose we have a variable with levels four,five,
and six.
ff = factor(rep(c('four','five','six'),c(5,7,2)))
Since the table() function will report the levels in the
same order as boxplot, I'll use that to illustrate my point:
table(ff)
ff
five four six
752
Suppose we want the levels to appear in the order four,
five,six:
table(factor(ff,levels=c('four','five','six')))
four five six
572
Now suppose we want to list them in the order of their frequencies:
table(factor(ff,levels=rev(names(table(ff)
six four five
257
In other words, you can have a factor's levels appear in whatever
order you'd like by using the levels= argument to factor.
Hope this helps.
- Phil Spector
Statistical Computing Facility
Department of Statistics
UC Berkeley
spec...@stat.berkeley.edu
On Mon, 18 Oct 2010, Sibylle Stöckli wrote:
Dear R users,
x-values (EI) = Adw, EG1, LA1, Ad1, LA2, LA3...(14 levels, insect
stages)
y-valus = antpop
within the boxplot function x-values are ordered alphabetically
Idea: x-values ranked by list order (insect stage: Egg stage 1 is
followed by Larvae 1 and not by Egg stage 2 as it would be in an
alphabetically order)
Problems with the order(tapply()) function: variable lengths differ
thanks
Sibylle
R-code (as later insect stages have higher means, ordering was based
on mean or median...)
SOPRA-read.table(SOPRA206_WG_WAE.txt, na.strings=0, header=TRUE)
ordered-order(tapply(SOPRA$antpop, SOPRA$EI, mean))
boxplot(antpop~ordered, data=SOPRA, boxwex=0.20, at=1:14-0.2,
scales=list(x=list(rot=45)), notch=TRUE, xlab = EVENT, ylab = DOY,
ylim = c(100,350), yaxs =i, col=red, subset=(wg == ctrl))
boxplot(antpop~ereignis, data=SOPRA, add=TRUE, boxwex=0.20,
at=1:14+0.2, xaxt=n, notch=TRUE, col=blue, subset=(wg == scen))
legend(1,330, c(SOPRA206 WGctrl, SOPRA206 WGscen), fill=c(red,
blue), bty=n)
text(1,340, Waedenswil, font=2, pos=4)
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