PROC CUSUM Statement

Overview

The PROC CUSUM statement starts the CUSUM procedure and it identifies input data sets.

After the PROC CUSUM statement, you provide an XCHART statement that specifies the cusum chart you want to create and the variables in the input data set that you want to analyze. For example, the following statements request a one-sided (decision interval) cusum chart:

   proc cusum data=values;
      xchart weight*lot / scheme = onesided
                          mu0    = 8.100
                          sigma0 = 0.050
                          delta  = 1
                          h      = 2.2
                          k      = 0.5;
   run;

In this example, the DATA= option specifies an input data set (VALUES) that contains the process measurement variable WEIGHT and the subgroup-variable LOT. ^*

You can use options in the PROC CUSUM statement to

specify input data sets containing variables to be analyzed, parameters for cusum schemes, or annotation information
specify a graphics catalog for saving graphical output
specify that charts are to be produced on graphics devices or line printers
define characters used for features on charts produced on line printers

In addition to the XCHART statement, you can provide BY statements, ID statements, TITLE statements, and FOOTNOTE statements. If you are using a graphics device, you can also provide graphics enhancement statements, such as SYMBOLn statements, which are described in SAS/GRAPH Software: Reference.

Note: If you are using the CUSUM procedure for the first time, you should read both this chapter and "Getting Started" in Chapter 12, "XCHART Statement."

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