The UCHART statement creates ANOM charts for group (treatment level) rates, also referred to as ANOM u charts. The rate plotted on a u chart is the number or count of events occurring in a group divided by a measure of the opportunity for an event to occur.

You can use options in the UCHART statement to

• compute decision limits from the data based on specified parameters, such as the significance level ()

• tabulate group summary statistics and decision limits

• save decision limits in an output data set

• save group summary statistics 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 on the same chart

• add block legends and symbol markers to identify special groups

• superimpose stars at points to represent related multivariate factors

• 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 charts with the UCHART statement:

• Traditional graphics are produced by default.

• ODS Graphics output is produced when you specify the ODS GRAPHICS statement prior to the PROC ANOM statement.

See Chapter 3, SAS/QC Graphics, for more information about producing these different kinds of graphs.