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Joint X and R Charts with Variable Sample Sizes and Sampling Intervals

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Author(s)
Costa, Antonio F.B.
Citation
Journal of Quality Technology, April 1997, Vol. 29, No. 2, pp. 197-204
Date
1996
Abstract
Recent studies have shown that the chart with variable sampling intervals (VSI) and/or with variable sample sizes(VSS) detects process shifts faster that the traditional chart. This article extends these studies for processes that are monitored by both, the and the R charts. A Markov chain model is used to determine the properties of the joint and R charts with variable sample sizes and sampling intervals (VSSI) scheme improves the joint and R control chart performance (in terms of the speed with which process mean and/or variance shifts are detected).
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http://digital.library.wisc.edu/1793/69171 
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