Phase I Control Charts for Times Between Events

Document Type

Article

Publication Date

11-2002

Publication Title

Quality and Reliability Engineering International

DOI

10.1002/qre.496

ISSN

1099-1638

Abstract

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.

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