XRCHART Statement: SHEWHART Procedure

Axis Labels

You can specify axis labels by assigning labels to particular variables in the input data set, as summarized in the following table:

Axis

Input Data Set

Variable

Horizontal

all

subgroup-variable

Vertical ($\bar{X}$ chart)

DATA=

process

Vertical ($\bar{X}$ chart)

HISTORY=

subgroup mean variable

Vertical ($\bar{X}$ chart)

TABLE=

_SUBX_

You can specify distinct labels for the vertical axes of the $\bar{X}$ and R charts by breaking the vertical axis into two parts with a split character. Specify the split character with the SPLIT= option. The first part labels the vertical axis of the $\bar{X}$ chart, and the second part labels the vertical axis of the R chart.

For example, the following sets of statements specify the label "Avg Diameter in mm" for the vertical axis of the $\bar{X}$ chart and the label "Range in mm" for the vertical axis of the R chart: 

proc shewhart data=Wafers;
   xrchart Diameter*Batch / split = '/' ;
   label Diameter = 'Avg Diameter in mm/Range in mm';
run;

proc shewhart history=Wafersum;
   xrchart Diameter*Batch / split = '/' ;
   label DiameterX = 'Avg Diameter in mm/Range in mm';
run;

proc shewhart table=Wafertab;
   xrchart Diameter*Batch / split = '/' ;
   label _SUBX_ = 'Avg Diameter in mm/Range in mm';
run;

In this example, the label assignments are in effect only for the duration of the procedure step, and they temporarily override any permanent labels associated with the variables.