Boxplots allow to easily visualise factor levels within a variable

Basic code to make a boxplot with names on the X axis:

boxplot(one, two, names=list("one", "two"), col=c(2,4), main ='Boxplots of one and two))

Note the xlab command does not work for boxplots.

names=list("one", "two") is used instead.

This does not mean the x axis of a boxplot is not numbered. For example for pointing the coordinates of a legend, each box counts as 1 on the x axis.

Boxplots allow to easily visualise factor levels within a variable:

boxplot(one(data$sex=='M'), one(data$sex=='F'))

Tag Graphics