Detecting a Shift in Fraction Nonconforming Using Run-Length Control Charts with 100% Inspection
作者:
BourkePatrick D.,
期刊:
Journal of Quality Technology
(Taylor Available online 1991)
卷期:
Volume 23,
issue 3
页码: 225-238
ISSN:0022-4065
年代: 1991
DOI:10.1080/00224065.1991.11979328
出版商: Taylor&Francis
关键词: CUSUM Chart;p-Chart;Statistical Process Control
数据来源: Taylor
摘要:
When 100% inspection in the order of production is in progress, an alternative approach to thep-chart or the Poisson-based CUSUM chart is to monitor the lengths of runs of conforming items between successive nonconforming items. Two Shewhart-type charts and a CUSUM chart based on such run lengths are presented and comparisons are made with the performance of thep-chart and the Poisson CUSUM chart in detecting shifts in fraction nonconforming. The run-length CUSUM chart is found to be more efficient than the Poisson CUSUM chart, while the run-length Shewhart chart based on the sum of the two most recent run lengths (termed the RL2chart) is more efficient than thep-chart for detecting large shifts in fraction nonconforming.
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