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    Please use this identifier to cite or link to this item: https://nccur.lib.nccu.edu.tw/handle/140.119/36659


    Title: 考慮兩階段相依製程下量測誤差對指數加權移動平均管制圖之效應研究
    Effects of Measurement Error on EWMA Control Charts for Two-Step Process
    Authors: 何漢葳
    Ho, Han-Wei
    Contributors: 楊素芬 博士
    Dr. Su-Fen Yang
    何漢葳
    Ho, Han-Wei
    Keywords: Imprecise measurement
    Dependent processes
    EWMA control chart
    Cause-selecting
    Date: 2002
    Issue Date: 2009-09-18 19:08:54 (UTC+8)
    Abstract: 無
    In this article, a two-step process is considered to investigate the effects of measurement errors on EWMA
    and cause-selecting EWMA control charts. At the end of current process, a pair of imprecise measurements of in-coming quality and out-going quality is randomly taken with individual units.
    The linear relationship between in-coming quality and out-going quality is assumed and four possible states of the process are defined with respective distributions of in-coming and out-going
    qualities derived. The EWMA control chart with measurement error is then constructed to monitor small-scale shift in mean for the previous process while the cause-selecting control chart, or EWMA control chart based on residuals, including measurement error, is proposed to diagnose the state of current process.
    Based on sensitivity analysis, the presence of imprecise measurement diminishes the power of both the EWMA and the proposed control charts and affects the detectability of process disturbances. Further, applications of proposed control charts are demonstrated through a numerical example to show some possible misuses of control charts. If the process mean shifts in a small scale when a single assignable cause occurs on each step, the proposed cause-selecting control chart is more sensitive than other control charts. The Hotelling T^2 control chart is also compared to illustrate the diagnostic advantage outweighed by proposed cause-selecting control chart.
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    Description: 碩士
    國立政治大學
    統計研究所
    90354015
    91
    Source URI: http://thesis.lib.nccu.edu.tw/record/#G0090354015
    Data Type: thesis
    Appears in Collections:[Department of Statistics] Theses

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