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Original Articles

Robust cusum: a robustness study for cusum quality control schemes

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Pages 2669-2687 | Received 01 Nov 1981, Published online: 22 Jun 2010
 

Abstract

A standard CUSUM control scheme and four modified CUSUM control schemes are evaluated for robustness. The average run length (ARL) for each scheme is evaluated using a contaminated normal distribution, a distribution that has longer tails than the normal. A CUSUM control scheme that ignores the first suspected outlier, but gives an out-of-control signal for two successive outliers is found to perform well.

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