How to add boxplots to scatterplot with jitter

Question

I am using following commands to produce a scatterplot with jitter:

ddf = data.frame(NUMS = rnorm(500), GRP = sample(LETTERS[1:5],500,replace=T))
library(lat         


        

Answer 1

To do this in ggplot2, try:

ggplot(ddf, aes(x=GRP, y=NUMS)) + 
  geom_boxplot(outlier.shape=NA) + #avoid plotting outliers twice
  geom_jitter(position=position_jitter(width=.1, height=0))

Obviously you can adjust the width and height arguments of position_jitter() to your liking (although I'd recommend height=0 since height jittering will make your plot inaccurate).