Quality and Reliability Methods - SAS

Chapter 5 Shewhart Control Charts 77
Shewhart Control Charts for Variables
Figure 5.5 Launch Dialog for Individual Measurement and Moving Range Chart
To complete this example,
• Choose the Analyze > Quality And Process > Control Chart > IR command.
• Select both Individual Measurement and Moving Range chart types.
• Specify Acid as the Process variable.
• Specify Date as the Sample Label variable.
• Click OK.
Alternatively, you can also submit the following JSL for this example:
Control Chart(Sample Label( :Date), GroupSize(1), KSigma(3), Chart Col( :Acid,
Individual Measurement, Moving Range));
The individual measurement and moving range charts shown in Figure 5.6 monitor the acidity in each vat
produced.
Note: A Median Moving Range chart can also be evaluated. If you choose a Median Moving Range chart
and an Individual Measurement chart, the limits on the Individual Measurement chart use the Median
Moving Range as the sigma, rather than the Average Moving Range.