Variable Sampling Interval X-bar Control Charts with an Improved SwitchingRule

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This paper proposes variable sampling interval (X) over bar control charts with an improved switching rule which uses a long sampling interval if l(2)(greater than or equal to 2) consecutive sample means fall close to centerline and short interval otherwise. A Markov chain approach is used to derive the formulas for evaluating the average time to signal and the average number of switches to signal. Comparisons between the proposed and existing variable sampling interval (X) over bar control charts indicate that the proposed charts considerably reduce the average number of switches between short and long sampling intervals, while they are comparable with respect to the average time to signal. (C) 2002 Elsevier Science B.V. All rights reserved.
Publisher
Elsevier Science Bv
Issue Date
2002
Language
English
Article Type
Article
Keywords

SHEWHART CONTROL CHARTS; (X)OVER-BAR CHARTS; XBAR CHARTS; AVERAGE

Citation

INTERNATIONAL JOURNAL OF PRODUCTION ECONOMICS, v.76, no.2, pp.189 - 199

ISSN
0925-5273
URI
http://hdl.handle.net/10203/78881
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