## The grouped boxplot is one of the features included in the HH package.
## You will need to install HH if you do not yet have the HH package
## A similar example is posted on my website
## http://astro.ocis.temple.edu/~rmh/HH/bwplot-color.pdf
## This is fake data which I hope mimics the structure you hinted at.
## I am using n=10 levels of Factor and 6 Years
## with 5 observations at each Year:Factor value
X <- data.frame(Year=rep(factor(1999:2004), each=10),
Factor=factor(rep(1:10, 6)),
Freq=1:60)
X <- rbind(X,X,X,X,X)
X$Freq <- X$Freq + rnorm(5*60, s=3)
X$YearFactor <- with(X, interaction(Factor, Year))
## install.packages("HH") ## if you do not yet have the HH package
library(HH)
b1 <- bwplot(Freq ~ Year, data=X,
panel=panel.bwplot.intermediate.hh,
col=1:6,
scales=list(x=list(limits=c(0,7), at=1:6, labels=levels(X$Year))),
main="Grouped")
b2 <- bwplot(Freq ~ YearFactor, data=X,
panel=panel.bwplot.intermediate.hh,
col=rep(1:6, each=10),
scales=list(x=list(limits=c(0,70)-5, at=seq(10,60,10)-5,
labels=levels(X$Year))),
main="Ungrouped")
print(b1, split=c(1,1,1,2), more=TRUE)
print(b2, split=c(1,2,1,2))
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