Lattice side by side boxplots with average

and then with the superposition of relative average values to the boxplots,
i.e. something like:

panel.points(?, mean.values, ..., pch = 17)

Almost. You need to give panel.points the new x, and make sure the
right mean.values go to the right place because the order of tapply
output is not necessarily the same order as y, even though I never
quite understood why myself...
Bottom line, this should it:

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, ...)
         mean.values <- tapply(y, x, mean)
         panel.points(x + (group.number-1.5)/3, mean.values[x], pch=17)
})

Cheers

but for some reasons I?m not able to properly combine these code snippets in
a successful way

any help much appreciated, thank you



--
View this message in context: http://r.789695.n4.nabble.com/Lattice-side-by-side-boxplots-with-average-tp4617831.html
Sent from the R help mailing list archive at Nabble.com.

______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.