Variable Specification (SPCHART command)

If data are organized as shown in Table 1, the variable specifications on XR and XS subcommands are

VAR BY VAR

The variable that is specified before BY is the process variable, which is the variable that contains values for all instances to be plotted (for example, LENGTH in Table 1). The variable that is specified after BY is the category variable or the BY variable, which is the subgroup identifier (for example, SUBGROUP in Table 1). The process variable must be numeric, while the category variable can be of any type. The chart is sorted by the category variable.

If data are organized as shown in Table 2, the variable specifications on XR and XS subcommands are

VAR VAR [VAR...] [BY VAR]

Each of the variables that is specified before BY represents an instance to be plotted (for example, N1 to N3 in Table 2). At least two variables are required, and each variable must be numeric. Keyword BY and the category variable (for example, SUBGROUP in Table 2) are optional; if specified, the category variable provides labels for the category axis and can be any type of variable. If omitted, the category axis is labeled from 1 to the number of variables that are specified before keyword BY.

SPCHART /TEMPLATE='ctrl.sgt'
 /XR SUBSIZE BY SHIFT.