The RL2 chart versus the np chart for detecting upward shifts in fraction defective

Patrick Bourke

Journal of Applied Statistics, 2006, vol. 33, issue 1, 1-15

Abstract: The use of the np chart for monitoring fraction-defective is well-established, but there are a number of relatively simple alternatives based on run-lengths of conforming items. Here, the RL2 chart, based on the moving sum of two successive conforming run-lengths, is investigated in order to provide SPC practitioners with clear-cut guidance on the comparative performance of these competing charts. Both sampling inspection and 100% inspection are considered here, and it is shown that the RL2 chart can often be considerably more efficient than the np chart, but the comparative performance depends on the false-alarm rate used for the comparison. Graphs to aid parameter-choice for the RL2 chart are also provided.

Keywords: Conforming run-length; control chart; statistical process control (search for similar items in EconPapers)
Date: 2006
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Citations: View citations in EconPapers (4)

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DOI: 10.1080/02664760500389400

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