Chickweight

library(MASS)
data("ChickWeight")
head(ChickWeight)
##   weight Time Chick Diet
## 1     42    0     1    1
## 2     51    2     1    1
## 3     59    4     1    1
## 4     64    6     1    1
## 5     76    8     1    1
## 6     93   10     1    1

Boxplot

Note that the echo = FALSE parameter was added to the code chunk to prevent printing of the R code that generated the plot.