This will add triangles at the mean value. To change the behavior of
boxplot() to draw means instead of medians would involve rewriting the
bxp() code I believe. You could change the points in the code below to
segments. See ?segments. The archives have quite a few examples of
people modifying the bxp() code so look there and see ?bxp.
# Load some data
data(OrchardSprays)
# Make the boxplot and save the boxplot object
rb <- boxplot(decrease ~ treatment, data = OrchardSprays)
# Compute the means
mean.value <- tapply(OrchardSprays$decrease,
OrchardSprays$treatment, mean)
# Add them as triangles.
points(seq(rb$n), mean.value, pch = 17)
HTH, Andy
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