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    题名: A Double Sampling Scheme for Process Mean Monitoring
    作者: 楊素芬
    Yang, Su-Fen;Wu, Sin-Hong
    贡献者: 統計系
    关键词: Control charts;Monitoring;Process control;Exponential distribution;Electronic mail;Gaussian distribution;Manufacturing processes
    日期: 2016-12
    上传时间: 2017-04-26 17:04:26 (UTC+8)
    摘要: Mean control charts are effective tools for detecting mean shifts of an interesting quality variable in both manufacturing processes and service processes. Much of the data in service industries come from processes exhibiting non-normal or unknown distributions. The commonly used Shewhart mean control charts, which depend heavily on the normality assumption, are not appropriately used here. This paper thus proposes an asymmetric EWMA mean chart with a double sampling scheme (DS EWMA-AM chart) for monitoring mean shifts of a process with variables data. Furthermore, we explore the sampling properties of the new mean monitoring statistics, and investigate the out-of-control detection performance of the proposed DS EWMA-AM chart using average run lengths. The detection performance of the DS EWMA-AM chart and that of the single sampling EWMA mean (SS EWMA-AM) chart are then compared, with the former showing superior out-of-control detection performance versus the latter. We also compare the out-of-control mean detection performance of the proposed chart with those of non-parametric mean control charts, like the likelihood ratio-based distribution-free NLE, CWE, SS EWMA-AM, the SL, the SU, and the VSS and DSVSI X control charts by considering cases in which the critical quality characteristic presents normal, double exponential, uniform, chi-square and exponential distributions, respectively. Comparison results show that the proposed control chart always outperforms the existing mean control charts. We hence recommend employing the DS EWMA-AM chart. A numerical example of a service system for a bank branch in Taiwan is used to illustrate the application of the proposed mean control chart. Finally, we give a discussion for future study.
    關聯: IEEE Access , Volume: PP, Issue: 99
    数据类型: article
    DOI 連結: http://dx.doi.org/10.1109/ACCESS.2017.2660239
    DOI: 10.1109/ACCESS.2017.2660239
    显示于类别:[統計學系] 期刊論文

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