I have created a boxplot using ggplot2:
library(ggplot2)
dat <- data.frame(study = c(rep('a',50),rep('b',50)),
FPKM = c(rnorm(1:50),rnorm(1:50)))
ggplot(dat, aes(x = study, y = FPKM)) + geom_boxplot()
The boxplot shows the median as a horizontal line across each box.
How do I add a dashed line to the box representing the mean of that group?
Thanks!
You can add horizontal lines to plots by using stat_summary
with geom_errorbar
. The line is horizontal because the y minimum and maximum are set to be the same as y.
ggplot(dat, aes(x = study, y = FPKM)) +
geom_boxplot() +
stat_summary(fun.y = mean, geom = "errorbar", aes(ymax = ..y.., ymin = ..y..),
width = .75, linetype = "dashed")
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