|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:
- If you create an OUTHISTORY= or OUTTABLE=
data set, the ID variables
are included. If the input data set is a DATA= data
set, only the values of the ID variables from the
first observation in each subgroup are passed to
the output data set.
- If you specify the TABLEID or TABLEALL options in
a chart statement, the table produced is augmented
by a column for each of the ID variables. Only the
values of the ID variables from the first observation
in each subgroup are tabulated. See the entry for
the TABLEID option in Chapter 46, "Dictionary of Options."
- If you specify the BOXSTYLE=SCHEMATICID option or the
BOXSTYLE= SCHEMATICIDFAR option in the BOXCHART statement,
the value of the first variable listed in the ID statement
is used to label each extreme observation. See
Output 32.2.3 and Output 32.2.4.
Copyright © 1999 by SAS Institute Inc., Cary, NC, USA. All rights reserved.