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arXiv 1808.05069stat.ME
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多元指数加权移动平均控制图的稳态行为

The Steady-State Behavior of Multivariate Exponentially Weighted Moving Average Control Charts

Sven Knoth

摘要:

多变量指数加权移动平均(MEWMA)图是检测多变量数据流中分布变化的流行、方便和有效的程序。为了进行适当的性能分析,处理MEWMA统计量的稳态行为是必不可少的。超越早期的论文,我们得到相当准确的近似各自的稳态密度的MEWMA统计。事实证明,这些密度可以重写为两个函数的乘积,仅取决于一个参数,这允许可行的计算。为了证明相关的陈述,非中心卡方密度部署合流超几何极限函数的表示被应用。使用新的方法,它被发现,对于大尺寸,稳态行为变得不同,人们可能会期望从单变量监测领域。基于积分方程驱动的方法,稳态和最坏情况下的平均运行长度的计算精度比以前更高。最后,最佳MEWMA平滑常数推导出所有考虑的措施。

英文摘要:

Multivariate Exponentially Weighted Moving Average, MEWMA, charts are popular, handy and effective procedures to detect distributional changes in a stream of multivariate data. For doing appropriate performance analysis, dealing with the steady-state behavior of the MEWMA statistic is essential. Going beyond early papers, we derive quite accurate approximations of the respective steady-state densities of the MEWMA statistic. It turns out that these densities could be rewritten as the product of two functions depending on one argument only which allows feasible calculation. For proving the related statements, the presentation of the non-central chisquare density deploying the confluent hypergeometric limit function is applied. Using the new methods it was found that for large dimensions, the steady-state behavior becomes different to what one might expect from the univariate monitoring field. Based on the integral equation driven methods, steady-state and worst-case average run lengths are calculated with higher accuracy than before. Eventually, optimal MEWMA smoothing constants are derived for all considered measures.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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