adding the mean and standard deviation to boxplots
Not precisely what you asked for but see the notch= argument to boxplot for a graphic measure of variability. If you simply wish to print certain statistics below the numbers already on the X axis then see: https://stat.ethz.ch/pipermail/r-help/2008-January/152994.html
On Feb 4, 2008 10:41 AM, Tom Cohen <tom.cohen78 at yahoo.se> wrote:
Dear list,
How can I add the mean and standard deviation to each of the boxplots using the example provided in the boxplot function?
boxplot(len ~ dose, data = ToothGrowth,
boxwex = 0.25, at = 1:3 - 0.2,
subset = supp == "VC", col = "yellow",
main = "Guinea Pigs' Tooth Growth",
xlab = "Vitamin C dose mg",
ylab = "tooth length", ylim = c(0, 35), yaxs = "i")
boxplot(len ~ dose, data = ToothGrowth, add = TRUE,
boxwex = 0.25, at = 1:3 + 0.2,
subset = supp == "OJ", col = "orange")
legend(2, 9, c("Ascorbic acid", "Orange juice"),
fill = c("yellow", "orange"))
Thanks for any help,
Tom
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