Quality and Reliability Methods - SAS

68 Interactive Control Charts Chapter 4
Additional Example of Control Chart Builder
At the end of phase 1, an adjustment was made to the manufacturing equipment. Therefore, the control
limits for the entire series should not be used to assess the control during phase 2.
To compute separate control limits for each phase:
5. Add Phase to the Phase role.
6. In the Average chart, right-click and select Warnings > Test Beyond Limits.
Figure 4.6 Control Charts for each Phase
Including the Phase variable means that the control limits for phase 2 are based only on the data for phase
2. None of the phase 2 observations are outside the control limits. Therefore, you can conclude that the
process is in control after the adjustments were made.