Example 18.1: Using Box Plots to Compare Groups. In the following example, a box plot is used to compare the delay times for airline flights during the Christmas holidays with the delay times prior to ...

The following example shows how to create a box plot with box-and-whisker plots whose widths vary proportionately with the group size. ... informat day date7. ; format day date7. ; input day @ ; do ...

Bar plots typically represent only the mean and s.d. or s.e.m. Box plots visualize the five-number summary of a data set (minimum, lower quartile, median, upper quartile and maximum).