Given the following example
library(lattice)
attach(barley)
After a long meandering around the web I managed to get a side by side
boxplots through:
bwplot(yield ~ site, data = barley, groups=year,
pch = "|", box.width = 1/3,
auto.key = list(points = FALSE, rectangles = TRUE, space = "right"),
panel = panel.superpose,
panel.groups = function(x, y, ..., group.number) {
panel.bwplot(x + (group.number-1.5)/3, y, ...)
}
)
now, my objective is to superpose the average for each boxplot;
I’ve been learning, again somewhere around the web, that this task has
something to do (obviously) first of all with the calculation of the
averages, i.e. something like:
mean.values <- tapply(y, x, mean)
and then with the superposition of relative average values to the boxplots,
i.e. something like:
panel.points(…, mean.values, ..., pch = 17)
but for some reasons I’m not able to properly combine these code snippets in
a successful way
any help much appreciated, thank you
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