Technically, the data for individual measurements and moving range charts are not arranged in rational subgroups. The term subgroup-variable is used for consistency with other chart statements in the SHEWHART procedure, and it is convenient to think of the "subgroups" as consisting of single measurements.
In Release 6.12 and previous releases of SAS/QC software, the keyword GRAPHICS was required in the PROC SHEWHART statement to specify that the chart be created with a graphics device. In Version 7, you can specify the LINEPRINTER option to request line printer plots.
In Release 6.09 and in earlier releases, it is also necessary to specify the READLIMITS option to read control limits from a LIMITS= data set.
In Release 6.09 and in earlier releases, it is necessary to specify the READLIMITS option.
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