How to change the width of the middle line in box whisker plot in ggplot2 in R?

Question

In the current version of ggplot2, the middle line in a box-whisker-plot is drawn bold compared to the other lines:

library(ggplot2)
p <- ggplot(mtcars, aes(factor(cyl), mpg))
p + geom_boxplot()

I think this was not the case in some older versions. Is there a way to separately adjust the width of the middle line?

score 9 · Accepted Answer · answered Sep 23 '13 at 12:32

9

Poorly documented, but you can use the fatten argument in geom_boxplot

library(ggplot2)
p <- ggplot(mtcars, aes(factor(cyl), mpg))
p + geom_boxplot(fatten = 0)

enter image description here

p + geom_boxplot(fatten = 4)

enter image description here

answered Sep 23 '13 at 12:32

Henrik

1 Answers1