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Title: An improved self-starting cumulative count of conforming chart for monitoring high-quality processes under group inspection
Authors: Zhang, C.W.
Xie, M. 
Jin, T.
Keywords: ARL-unbiased
control chart
cumulative conformance count
high-quality process
Issue Date: 1-Dec-2012
Citation: Zhang, C.W., Xie, M., Jin, T. (2012-12-01). An improved self-starting cumulative count of conforming chart for monitoring high-quality processes under group inspection. International Journal of Production Research 50 (23) : 7026-7043. ScholarBank@NUS Repository.
Abstract: The cumulative count of conforming (CCC) chart as a main statistical process control tool for monitoring high-quality processes has been widely studied. However, its applicability is limited to situations where units of product are inspected sequentially, or item by item. Motivated by real-life problems, this paper proposes an improved control charting technique for high-quality processes under group inspection. It integrates a self-starting feature and an approximately ARL- (average run length) unbiased design. The chart, named the CCCG chart, monitors the cumulative count of conforming samples until a non-conforming one is encountered. The G in the subscript stands for Group. The self-starting feature caters to the need in practice to start monitoring a production process as soon as possible. The approximately ARL-unbiased design is developed to significantly improve the chart's sensitivity to process deterioration compared with the conventional design. The performance of the CCCG chart in phase I when the control limits are sequentially updated has been examined. Simulated data examples are presented to demonstrate the use and efficiency of the proposed technique. The CCCG chart is a natural generalisation of the traditional CCC chart and thus includes the latter as a special case. © 2012 Copyright Taylor and Francis Group, LLC.
Source Title: International Journal of Production Research
ISSN: 00207543
DOI: 10.1080/00207543.2011.649305
Appears in Collections:Staff Publications

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