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政大機構典藏 > 商學院 > 統計學系 > 期刊論文 > Item 140.119/63781

Please use this identifier to cite or link to this item: https://nccur.lib.nccu.edu.tw/handle/140.119/63781

Title:	Using a new VSI EWMA average loss control chart to monitor changes in the difference between the process mean and target and/or the process variability
Authors:	楊素芬 Yang, Su-Fen
Contributors:	統計系
Keywords:	Control chart;Loss function;Markov chain;Variable sampling intervals
Date:	2013.06
Issue Date:	2014-02-11 14:01:27 (UTC+8)
Abstract:	A single chart, instead of View the MathML sourceX¯ and R charts or View the MathML sourceX¯ and S charts, to simultaneously monitor the process mean and variability would reduce the required time and effort. A number of studies have attempted to find such charts. Moreover, a number of studies demonstrated that the adaptive control charts may detect process shifts faster than the fixed control charts. This paper proposes an easier EWMA average loss chart with variable sampling intervals to effectively monitor the process and diagnose whether the out-of-control process is caused by the changes in the difference of process mean and target or the increase in process variability, or both. Furthermore, an optimal variable sampling interval EWMA average loss chart is also proposed. An example is used to illustrate the application and evaluate the performance of the proposed control chart in detecting and diagnosing the increases in the difference of the process mean and target and/or the process variability. Numerical analyses demonstrated that the optimal VSI EWMA average loss chart outperforms the average loss chart with fixed design parameters and the Shewhart joint View the MathML sourceX¯ and S charts. Therefore, the (optimal) VSI EWMA average loss chart is recommended.
Relation:	Applied Mathematical Modelling, 37(16-17), 7973-7982
Data Type:	article
DOI 連結:	http://dx.doi.org/10.1016/j.apm.2013.03.023
DOI:	10.1016/j.apm.2013.03.023
Appears in Collections:	[統計學系] 期刊論文

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