How to put Values on Boxplot in R for several boxplot in one image

Question

I want to plot Delta~Project.Types in R. I have 10 Project Types. I know how to do the boxplot : boxplot(Delta~Project.Types). However, how can I put the fivenum (min, max,

Answer 1

The stats you want can also be obtained with fivenum

five <- by(InsectSprays$count, InsectSprays$spray, fivenum)
do.call(cbind, five)
#         A    B   C    D   E  F
# [1,]  7.0  7.0 0.0  2.0 1.0  9
# [2,] 11.0 12.0 1.0  3.5 2.5 12
# [3,] 14.0 16.5 1.5  5.0 3.0 15
# [4,] 18.5 18.0 3.0  5.0 5.0 23
# [5,] 23.0 21.0 7.0 12.0 6.0 26

Alternatively, these stats are one of the return values of boxplot (note that you need to use range = 0 to get the min and max since there are some values which are outlying):

bp <- boxplot(count ~ spray, data = InsectSprays, col = "lightgray", range = 0)
bp$stats
#      [,1] [,2] [,3] [,4] [,5] [,6]
# [1,]  7.0  7.0  0.0  2.0  1.0    9
# [2,] 11.0 12.0  1.0  3.5  2.5   12
# [3,] 14.0 16.5  1.5  5.0  3.0   15
# [4,] 18.5 18.0  3.0  5.0  5.0   23
# [5,] 23.0 21.0  7.0 12.0  6.0   26

Then just add to each box:

text(x = col(bp$stats) - .5, y = bp$stats, labels = bp$stats)