نتایج جستجو برای: ewma control chart

تعداد نتایج: 1351298  

Journal: :Communications in Statistics - Simulation and Computation 2022

To monitor time and magnitude, different types of control charts have been proposed in the literature. This article proposes a new maximum exponentially weighted moving average (Max-EWMA) chart by assuming Weibull distribution. The test-statistic Max-EWMA consists two EWMA statistics, where one statistic is used for monitoring magnitude while other to interval between events. performances asses...

Journal: :Technometrics 2011
Changliang Zou Fugee Tsung

1 60 2 61 3 62 4 63 5 64 6 65 7 66 8 67 9 68 10 69 11 70 12 71 13 72 14 73 15 74 16 75 17 76 18 77 19 78 20 79 21 80 22 81 23 82 24 83 25 84 26 85 27 86 28 87 29 88 30 89 31 90 32 91 33 92 34 93 35 94 36 95 37 96 38 97 39 98 40 99 41 100 42 101 43 102 44 103 45 104 46 105 47 106 48 107 49 108 50 109 51 110 52 111 53 112 54 113 55 114 56 115 57 116 58 117 59 118 A Multivariate Sign EWMA Control ...

Journal: :Academic journal of Nawroz University 2022

Abstract:
 In many real-world applications, the data to be used in a control charting method are not crisp since they approximated due environmental uncertainties, these situations, fuzzy numbers and linguistic variables grab such uncertainties. That is why use of chart, which used, justified. As an exponentially weighted moving average (EWMA) scheme usually detect small shifts, this paper ...

Journal: :Quality and Reliability Eng. Int. 2015
Saddam Akber Abbasi Muhammad Riaz Arden Miller Shabbir Ahmad Hafiz Zafar Nazir

Process monitoring through control charts is a quite popular practice in statistical process control. This study is planned for monitoring the process dispersion parameter using exponentially weighted moving average (EWMA) control chart scheme. Most of the EWMA dispersion charts that have been proposed are based on the assumption that the parent distribution of the quality characteristic is nor...

Journal: :Quality Technology & Quantitative Management 2016

Journal: :Pakistan Journal of Statistics and Operation Research 2016

Journal: :Journal of Modern Applied Statistical Methods 2020

Journal: :Computational Statistics & Data Analysis 2010
Jiujun Zhang Zhonghua Li Zhaojun Wang

Recently, monitoring the process mean and variability simultaneously for multivariate processes by using a single control chart has drawn some attention. However, due to the complexity of multivariate distribution, the existing methods in the univariate processes can not be readily extended to the multivariate processes. In this paper, we propose a new single control chart which integrates the ...

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