An adaptive moving average (A-MA) control chart with variable sampling intervals (VSI)

An adaptive moving average (A-MA) control chart with variable sampling intervals (VSI)

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Article ID: iaor20084222
Country: South Korea
Volume: 33
Issue: 4
Start Page Number: 457
End Page Number: 468
Publication Date: Dec 2007
Journal: Journal of the Korean Institute of Industrial Engineers
Authors:
Keywords: markov processes
Abstract:

This paper proposes an adaptive moving average (A-MA) control chart with variable sampling intervals (VSI) for detecting shifts in the process mean. The basic idea of the VSI A-MA chart is to adjust sampling intervals as well as to accumulate previous samples selectively in order to increase the sensitivity. The VSI A-MA chart employs a threshold limit to determine whether or not to increase sampling rate as well as to accumulate previous samples. If a standardized control statistic falls outside the threshold limit, the next sample is taken with higher sampling rate and is accumulated to calculate the next control statistic. If the control statistic falls within the threshold limit, the next sample is taken with lower sampling rate and only the sample is used to get the control statistic.

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