A simultaneous control scheme for mean and fraction non conforming in small process variation

Sang Joon Um and Jong Gurl Kim

Communications in Statistics - Theory and Methods, 2016, vol. 45, issue 16, 4745-4759

Abstract: In situations where 6σ is much smaller than the spread in specifications, the conventional p-chart is not applicable for monitoring a lower fraction non conforming process. In 6σ processes, a drift of the process mean is often allowed within at most 1.5σ from the target, and a modified control chart is a useful alternative to the usual X‾$\overline X $ chart. This paper proposes a ZP control chart as a more efficient alternative to the conventional p-chart, and a simultaneous control scheme for mean and fraction non conforming in small process variance is discussed.

Date: 2016
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DOI: 10.1080/03610926.2013.784989

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