The BOXPLOT Procedure |
This example shows how to create a box plot with box-and-whiskers plots whose widths vary proportionately with the group size. The following statements create a SAS data set named Times2 that contains flight departure delays (in minutes) recorded daily for eight consecutive days:
data Times2; label Delay = 'Delay in Minutes'; informat Day date7. ; format Day date7. ; input Day @ ; do Flight=1 to 25; input Delay @ ; output; end; datalines; 01MAR90 12 4 2 2 15 8 0 11 0 0 0 12 3 . 2 3 5 0 6 25 7 4 9 5 10 02MAR90 1 . 3 . 0 1 5 0 . . 1 5 7 . 7 2 2 16 2 1 3 1 31 . 0 03MAR90 6 8 4 2 3 2 7 6 11 3 2 7 0 1 10 2 5 12 8 6 2 7 2 4 5 04MAR90 12 6 9 0 15 7 1 1 0 2 5 6 5 14 7 21 8 1 14 3 11 0 1 11 7 05MAR90 2 1 0 4 . 6 2 2 1 4 1 11 . 1 0 . 5 5 . 2 3 6 6 4 0 06MAR90 8 6 5 2 9 7 4 2 5 1 2 2 4 2 5 1 3 9 7 8 1 0 4 26 27 07MAR90 9 6 6 2 7 8 . . 10 8 0 2 4 3 . . . 7 . 6 4 0 . . . 08MAR90 1 6 6 2 8 8 5 3 5 0 8 2 4 2 5 1 6 4 5 10 2 0 4 1 1 run;
The following statements create a box plot with varying box widths:
title 'Analysis of Airline Departure Delays'; title2 'Using the BOXWIDTHSCALE= Option'; proc boxplot data=Times2; plot Delay*Day / nohlabel boxstyle = schematic boxwidthscale = 1 bwslegend; run;
The BOXWIDTHSCALE=value option specifies that the widths of the box-and-whiskers plots vary in proportion to a particular function of the group size . The function is determined by value and is identified on the box plot with a legend if the BWSLEGEND option is specified. The BOXWIDTHSCALE= option is useful in situations where the group sizes vary widely.
Output 24.5.1 shows the resulting box plot.
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