Chapter 12
Statistical Quality Control and Phase II Control Charts
The focus of this chapter is a discussion of Phase II control charts. The topics covered are:
- Basic concepts of the CUSUM control chart
- Designing a CUSUM control chart
- Two-sided CUSUM control charts using numerical procedures
- The fast initial response (FIR) CUSUM control chart
- Combined Shewhart-CUSUM control charts
- CUSUM control chart for controlling process variability
- Moving average control charts
- Exponentially weighted moving average control charts
Learning Outcomes:
After studying this chapter, the reader will be able to
- Understand the difference between Phase I and Phase II control charts.
- Set up one-sided and two-sided CUSUM control charts.
- Set up one-sided and two-sided tabular CUSUM control charts.
- Understand the advantages of CUSUM control charts over
and R control charts. - Set up moving average (MA) control charts.
- Set up exponential weighted moving average (EWMA) control charts.
Introduction:
In Chapter 11 we studied Phase I Shewhart control charts for detecting large shifts in any process. In this chapter we will study the next generation of control charts: cumulative sum (CUSUM), moving average (MA), and exponentially weighted moving average (EWMA) control charts. As noted earlier, large shifts usually occur in Phase I of the implementation of SPC, when a process is under strong influence of special ...
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