Quality and Reliability Engineering International

A Comparative Study of Joint Monitoring Schemes for APC Processes

Journal Article


To monitor processes under automatic process control (APC), several joint monitoring schemes have recently been proposed, such as the U statistics, equation image and equation image, that originate from the uniformly most powerful test. It is known that the equation image chart is sensitive to large shift detection whereas the equation image chart is sensitive to small shift detection. To take advantage of both charts, this paper examines a combined use of the two U charts. A comparative study indicates that the combined procedure improves over a single U chart and performs better than other joint monitoring schemes, including Hotelling's equation image chart for APC processes. Copyright © 2006 John Wiley & Sons, Ltd.

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