Process Capability Analysis with R

Abstract

Process capability analysis is one of the important aspects of overall quality improvement. In this chapter we explain different methods of assessing the process capability of products and services. We also explain the specification limits, and control limits and how they are related to the process capability analysis. Process capability is the ability of the process to meet specifications. The ability of the process to meet the specifications is related to the variability in the process. This variability can be (1) natural or inherent variability at a given time or (2) variability over time. We may think of this as short-term and long-term variability. Thus, the process capabil- ity may be viewed as the short-term process capability or long-term process capability.