Results 171 to 180 of about 13,618 (198)
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Quality Technology & Quantitative Management, 2005
AbstractIn this paper, we extend the exponentially weighted moving average (EWMA) technique to double exponentially weighted moving average (DEWMA) technique. We show that DEWMA mean charts perform better than EWMA mean charts in detecting small mean shifts ranging from 0.1 to 0.5 of the process standard deviation, and that the two types of charts ...
Lingyun Zhang, Gemai Chen
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AbstractIn this paper, we extend the exponentially weighted moving average (EWMA) technique to double exponentially weighted moving average (DEWMA) technique. We show that DEWMA mean charts perform better than EWMA mean charts in detecting small mean shifts ranging from 0.1 to 0.5 of the process standard deviation, and that the two types of charts ...
Lingyun Zhang, Gemai Chen
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Improved variable EWMA controller design
Proceeding of the 11th World Congress on Intelligent Control and Automation, 2014The exponentially weighted moving average (EWMA) controller is a popular run-to-run (RtR) control scheme in semiconductor manufacturing because of its effectiveness and simplicity. In this paper we propose an improved variable EWMA controller design method.
Ming-Da Ma, Jia-Yi Li, Kai Zhang
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Estimating Value at Risk: From JP Morgan's Standard-EWMA to Skewed-EWMA Forecasting
SSRN Electronic Journal, 2007Driven significantly by JP Morgan's RiskMetrics system with exponentially weighted moving average (EWMA) forecasting, value-at-risk (VaR) has become a popularly used measurement of the extent to which a financial asset is subject to the risks present in financial markets.
Zudi LU, Hai Huang
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The MaxMin EWMA tolerance limits
International Journal of Quality & Reliability Management, 2000When there is a change in a process, the MaxMin exponentially weighted moving average (EWMA) control chart shows which parameters have increased or decreased. The MaxMin EWMA may also be viewed as smoothed tolerance limits. Tolerance limits are limits that include a specific proportion of the population at a given confidence level.
Raid W. Amin, Kuiyuan Li
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2002
A problem with the conventional Shewhart charts is that the decisions are usually based on single observations. Such decision implies a high probability of false alarms. Also, small shifts in the process characteristics, which are of increasing importance from the point of view of efforts for continuous quality improvement, cannot be detected easily ...
M. Xie, T. N. Goh, V. Kuralmani
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A problem with the conventional Shewhart charts is that the decisions are usually based on single observations. Such decision implies a high probability of false alarms. Also, small shifts in the process characteristics, which are of increasing importance from the point of view of efforts for continuous quality improvement, cannot be detected easily ...
M. Xie, T. N. Goh, V. Kuralmani
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The EWMA median chart with estimated parameters
IIE Transactions, 2015ABSTRACTThe usual practice in control charts is to assume that the chart parameters are known or can be accurately estimated from in-control historical samples and the data are free from outliers. Both of these assumptions are not realistic in practice: a control chart may involve the estimation of process parameters from a very limited number of ...
Castagliola, Philippe +2 more
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Combined EWMA-mixed EWMA CUSUM schemes for monitoring the process mean
International Journal of Productivity and Quality Management, 2023Himani Shonik +2 more
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CS‐EWMA Chart for Monitoring Process Dispersion
Quality and Reliability Engineering International, 2012Control charts are the most extensively used technique to detect the presence of special cause variations in processes. They can be classified into memory and memoryless control charts. Cumulative sum and exponentially weighted moving average control charts are memory‐type control charts as their control structures are developed in such a way that the ...
Abbas, N., Riaz, M., Does, R.J.M.M.
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The efficiency of the EWMA capability chart
2007 IEEE International Conference on Industrial Engineering and Engineering Management, 2007In order to monitor unstable but capable processes Castagliola & Vannman have recently suggested a procedure based on an EWMA approach, called EWMA capability chart, for monitoring Vannman's Cp(u,v)-family of capability indices and showed how their proposed approach efficiently monitors capable processes by detecting a decrease or increase of the ...
Castagliola, Philippe, Vännman, Kerstin
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Automated EWMA Anomaly Detection Pipeline
2022 American Control Conference (ACC), 2022Samuel D. Gilletly +3 more
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