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Overview

The BOXCHART statement creates an ANOM chart for group (treatment level) means of response values superimposed with box-and-whisker plots of the measurements in each group. Throughout this chapter, a chart of this type is referred to as an ANOM boxchart. You can use options in the BOXCHART statement to

• compute decision limits from the data based on a specified parameters, such as the significance level ()
• tabulate group sample sizes, group means, decision limits, and other information
• save decision limits in an output data set
• save group sample sizes and group means in an output data set
• read decision limits and decision limit parameters from a data set
• display distinct sets of decision limits for different sets of groups
• specify one of several methods for calculating quantile statistics (percentiles)
• control the style of the box-and-whisker plots
• add block legends and symbol markers to identify special groups
• clip extreme points to make the chart more readable
• display vertical and horizontal reference lines
• control axis values and labels
• control layout and appearance of the chart

You have two alternatives for producing ANOM boxcharts with the BOXCHART statement:

• Traditional graphics are produced by default.
• ODS Graphics output (supported on an experimental basis in SAS 9.2) is produced when you specify the ODS GRAPHICS statement prior to the PROC ANOM statement.