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Effect of warning limits on the performance of the (X) chart under autocorrelation

机译:自相关下警告极限对(X)图表性能的影响

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摘要

(X) charts for variables arc one of the outstanding charts of statistical quality control (SQC), used to detect larger shifts in the process mean. In actual practice, many processes arc autocorrelated and if these charts arc used, their performance is deteriorated. The performance of the chart is measured in terms of the average run length (ARL), which is the average number of samples before getting an out-of-control signal. The ARLs at various sets of parameters of the (X) chart arc computed by simulation, using MATLAB. An attempt has been made to counter autocorrelation by designing the (X) chart using warning limits. Various optimal schemes are proposed for different levels of correlation (Φ). Moreover these optimal schemes of modified (X) chart arc compared with Derman-Ross's (Derman and Ross, 1997) and Klein's (2000) schemes at various levels of correlation (Φ). It is concluded that the modified (X) scheme outperforms the Derman-Ross's (2 of 2) scheme.
机译:(X)变量图是统计质量控制(SQC)杰出的图表之一,用于检测过程平均值的较大变化。在实际实践中,许多过程是自相关的,如果使用了这些图表,它们的性能将会下降。图表的性能以平均运行时间(ARL)进行衡量,ARL是获得失控信号之前的平均样本数。 (X)图表的各种参数集的ARL通过仿真使用MATLAB进行计算。试图通过使用警告极限设计(X)图表来抵消自相关。针对不同的相关度(Φ),提出了各种最佳方案。此外,与Derman-Ross(Derman and Ross,1997)和Klein(2000)方案相比,这些修改(X)图表的最佳方案在各种相关级别(Φ)上均得到了比较。结论是,修改后的(X)方案优于Derman-Ross的(2 of 2)方案。

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