Results 201 to 210 of about 2,575 (240)
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The exponentially‐weighted control charts for geometrically moving averages
Quality and Reliability Engineering International, 2023AbstractThis article is a sequel to the previous entitled “A Further Note on the Exponentially‐Weighted Moving Average Control Charts for Monitoring Gradual Shifts in a Process Mean” where the constant sample size n was equal to 1 in each subgroup. We have now generalized the results of the previous article first to the case of constant sample size n ...
Saeed Maghsoodloo, Daniel F. Silva
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A multivariate triple exponentially weighted moving average control chart
Quality and Reliability Engineering International, 2021AbstractStatistical process monitoring (SPM) is mostly populated with univariate control charts used to monitor a single variable (or quality characteristic). Nowadays, industries and online environments are filled with processes in which two or more quality characteristics are related.
Jean-Claude Malela-Majika +2 more
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The Exponentially Weighted Moving Average
Journal of Quality Technology, 1986The Shewhart and CUSUM control chart techniques have found wide application in the manufacturing industries. However, workpiece quality has also been greatly enhanced by rapid and precise individual item measurements and by improvements in automatic dynamic machine control.
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Forecasting Sales by Exponentially Weighted Moving Averages
Management Science, 1960The growing use of computers for mechanized inventory control and production planning has brought with it the need for explicit forecasts of sales and usage for individual products and materials. These forecasts must be made on a routine basis for thousands of products, so that they must be made quickly, and, both in terms of computing time and ...
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Exponentially weighted moving average acceptance charts
Quality and Reliability Engineering International, 2000A description of acceptance charts, which use subgroup averages, was published by Freund in 1957 (Industrial Quality Control 1957; (October): 13–23). The purpose of these charts is to evaluate a process in terms of whether or not it could be expected to satisfy product tolerances.
Donald S. Holmes, A. Erhan Mergen
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The Performance of Exponentially Weighted Moving Average Charts With Estimated Parameters
Technometrics, 2001The exponentially weighted moving average (EWMA) control chart is typically designed assuming that standards are given for the process parameters. In practice, the parameters are rarely known, and control charts are constructed using estimates in place of the parameters.
L. Allison Jones +2 more
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A sum of squares double exponentially weighted moving average chart
Computers & Industrial Engineering, 2011The sum of squares double exponentially weighted moving average (SS-DEWMA) chart is proposed to improve the performance of the single SS-EWMA chart, in the detection of initial out-of-control signals. The SS-DEWMA chart uses the sum of squares statistic and it simultaneously monitors the process mean and variance in a single chart.
Sin Yin Teh +2 more
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An Evaluation of the Double Exponentially Weighted Moving Average Control Chart
Communications in Statistics - Simulation and Computation, 2010In this article we perform a careful investigation of the double exponentially weighted moving average (DEWMA) chart performance for monitoring the process mean. We compare the performance of this chart to the usual EWMA control chart based on zero-state and worst-case average run length (ARL) measures. We also evaluate the signal resistance measure of
Mahmoud A. Mahmoud, William H. Woodall
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Exponentially Weighted Moving Average (EWMA) with Irregular Updating Periods
Journal of the Operational Research Society, 1993Summary: This paper shows how to modify the smoothing constant for use in an Exponentially Weighted Moving Average system, when data has to be combined either across a number of periods, or is available from only a fraction of a normal forecast review interval.
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Quality and Reliability Engineering International
ABSTRACT The generally weighted moving average (GWMA) control chart has been proposed as a generalization and alternative to the exponentially weighted moving average (EWMA) chart. Proponents of the GWMA claim that it is more efficient in detecting shifts in the process mean than the EWMA.
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ABSTRACT The generally weighted moving average (GWMA) control chart has been proposed as a generalization and alternative to the exponentially weighted moving average (EWMA) chart. Proponents of the GWMA claim that it is more efficient in detecting shifts in the process mean than the EWMA.
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