Default Labels

If a label is not associated with the subgroup-variable, the default horizontal axis label is "Subgroup Index (subgroup-variable)." The default vertical axis label for a primary chart identifies the chart type and the process variable. The default vertical axis label for a secondary chart identifies the chart type only.

For example, the following statements create and charts with default labels using the data set Parts given in Displaying Stratified Process Data. The resulting charts are displayed in Figure 15.173.

symbol v=none w=1;
title 'Control Chart for Diameter';
proc shewhart history=Parts;
   xschart Diam*Sample;
run;

Figure 15.173 Control Charts with Default Labels