Phase I Control Charts for Times Between Events
Quality and Reliability Engineering International
A count of the number of defects is often used to monitor the quality of a production process. When defects rarely occur in a process, it is often desirable to monitor the time between the occurrence of each defect rather than a count of the number of defects. An exponential distribution often provides a useful model of the time between defects. Phase I control charts for exponentially distributed processes are discussed. Methods for computing the control limits are given and the overall Type I error rates of these charts are evaluated.
Jones, L. Allison, Charles W. Champ.
"Phase I Control Charts for Times Between Events."
Quality and Reliability Engineering International, 18 (6): 479-488.