Design Strategies for Individuals and Moving Range Control Charts
作者:
RigdonSteven E.,
CruthisEmma N.,
ChampCharles W.,
期刊:
Journal of Quality Technology
(Taylor Available online 1994)
卷期:
Volume 26,
issue 4
页码: 274-287
ISSN:0022-4065
年代: 1994
DOI:10.1080/00224065.1994.11979539
出版商: Taylor&Francis
关键词: Autocorrelated Process;Average Run Length;Box-Cox Transformation;Moving Range Control Charts;X Control Charts
数据来源: Taylor
摘要:
Individuals and moving range charts are often used when production volume is too low to justify rational subgrouping. This article considers several aspects of the design strategy for these charts. We have found that theXchart alone is nearly as efficient as the combinedX-MR chart for detecting changes in the process variability. We recommend, however, that the control limits on the individuals chart be based on a shortterm estimate of the process variability, such as the moving range, rather than on a long term estimate, such as the sample standard deviation of the process. We also consider the effects of nonnormality and autocorrelation.
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