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PROC SHEWHART and General Statements

BY and ID Statements

In addition, you can optionally specify one of each of the following statements:

BY variables;
ID variables;
The BY statement specifies variables in the input data set that are used for BY processing. A separate control chart is created for each group of observations defined by the levels of the BY variables. The input data set must be sorted in order of the BY variables.

The ID statement specifies variables used to identify observations. The ID variables must be variables in the DATA= or HISTORY= input data sets.

The ID variables are used in the following ways:

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