Results 31 to 40 of about 2,575 (240)
A STUDY OF THE MEDIAN RUN LENGTH (MRL) PERFORMANCE OF THE EWMA t CHART FOR THE MEAN
South African Journal of Industrial Engineering, 2012 The exponentially weighted moving average (EWMA) chart is effective in detecting small shifts. However, the EWMA chart is not robust enough to prevent errors in estimating the process standard deviation or a changing standard deviation.
Chin, W. S., Khoo, M. B. C.
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A Comparison Between the MEWMA and Mahalanobis Distance Control Chart
Kurdistan Journal of Applied Research, 2021 Statistical Process Control (SPC) is approaching that uses statistical techniques to monitor the process. The methods of quality control are widely used in controlling any strategy—the widely used control charts.
Kawa Rashid
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Mixed Control Charts Using EWMA Statistics
IEEE Access, 2016 In this paper, two mixed control charts are designed for process monitoring when the quality characteristic of interest follows a normal distribution.
Muhammad Aslam +3 more
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Axioms, 2023 In industrial production, the exponentially weighted moving average scheme is widely used to monitor shifts in product quality, especially small-to-moderate shifts.
Dan Yu +5 more
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Evaluations of some Exponentially Weighted Moving Average methods [PDF]
Journal of Applied Statistics, 2003 The need for statistical surveillance has been noted in many different areas, and examples of applications include the detection of an increased incidence of a disease, the detection of an increased radiation level and the detection of a turning point in a leading index for a business cycle. In all cases, preventive actions are possible if the alarm is
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, 2022 งานวิจัยนี้มีวัตถุประสงค์เพื่อนำเสนอวิธีการประมาณค่าความยาวรันเฉลี่ยด้วยวิธีสูตรสำเร็จของแผนภูมิควบคุมค่าเฉลี่ยเคลื่อนที่-ค่าเฉลี่ยเคลื่อนที่ถ่วงนํ้าหนักแบบเลขชี้กำลัง (MA-EWMA) โดยเปรียบเทียบประสิทธิภาพการตรวจจับการเปลี่ยนแปลงกับแผนภูมิควบคุมค่าเฉล ...
Phantu, Suganya; Data Science and Computation Program, Faculty of Sciences, Energy and Environment, King Mongkut’s University of Technology North Bangkok, Rayong Campus, Rayong +2 more
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Score Driven Exponentially Weighted Moving Average and Value-at-Risk Forecasting [PDF]
SSRN Electronic Journal, 2014 We present a simple methodology for modeling the time variation in volatilities and other higher-order moments using a recursive updating scheme that is similar to the familiar RiskMetrics approach. The parameters are updated using the score of the forecasting distribution, which allows the parameter dynamics to adapt automatically to any non-normal ...
Lucas, André, Zhang, Xin
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IEEE Access, 2022 Many studies have shown that industrial as well as non-industrial business organisations present a growing need of robust and more efficient multivariate monitoring schemes in order to be able to monitor several quality characteristics simultaneous.
Jean-Claude Malela-Majika +2 more
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Modern multivariate control chart using spatial signed rank for non-normal process
Engineering Science and Technology, an International Journal, 2020 Modern multivariate control charts that use spatial signed rank are sensitive to the detection of small shifts under non-normal or gamma distributions.
Thidathip Haanchumpol +2 more
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Mathematics, 2022 In addition to monitoring the Poisson mean rate with step shifts, increasing attention has been given to monitoring Poisson processes subject to linear trends.
Honghao Zhao +3 more
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