文章基本信息

标题：On Efficient Monitoring of Process Dispersion using Interquartile Range
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作者：Shabbir Ahmad ; Zhengyan Lin ; Saddam Akber Abbasi 等
期刊名称：Open Journal of Applied Sciences
印刷版ISSN：2165-3917
电子版ISSN：2165-3925
出版年度：2012
卷号：2
期号：4B
页码：39-43
DOI：10.4236/ojapps.2012.24B010
出版社：Scientific Research Publishing
摘要：The presence of dispersion/variability in any process is understood and its careful monitoring may furnish the performance of any process. The interquartile range (IQR) is one of the dispersion measures based on lower and upper quartiles. For efficient monitoring of process dispersion, we have proposed auxiliary information based Shewhart-type IQR control charts (namely IQRr and IQRp charts) based on ratio and product estimators of lower and upper quartiles under bivariate normally distributed process. We have developed the control structures of proposed charts and compared their performances with the usual IQR chart in terms of detection ability of shift in process dispersion. For the said purpose power curves are constructed to demonstrate the performance of the three IQR charts under discussion in this article. We have also provided an illustrative example to justify theory and finally closed with concluding remarks.
关键词：Auxiliary Information; Bivariate Normal Distribution; Control Carts; Interquartile Range; Lower and Upper Quartiles; Power Curves.