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

For a lattice solution:

library(lattice)
ddf = data.frame(NUMS = rnorm(500), GRP = sample(LETTERS[1:5], 500, replace = T))
bwplot(NUMS ~ GRP, ddf, panel = function(...) {
  panel.bwplot(..., pch = "|")
  panel.xyplot(..., jitter.x = TRUE)})

The default median dot symbol was changed to a line with pch = "|". Other properties of the box and whiskers can be adjusted with box.umbrella and box.rectangle through the trellis.par.set() function. The amount of jitter can be adjusted through a variable named factor where factor = 1.5 increases it by 50%.