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The double exponentially weighted moving average DEWMA, which is known in the literature as Browns oneparameter linear method for forecasting is proposed as a control tool for process monitoring and detecting shifts in the process mean. Obtains a closedform expression for the asymptotic standard deviation of the proposed DEWMA control statistic and discusses the determination of its average run length. Provides examples and comparisons between the proposed DEWMA and the standard EWMA. The results reveal that the proposed DEWMA control scheme performs much better than a Shewhart scheme for small and moderate shifts in the process mean and it has average run length properties similar to those for EWMA control schemes. However, DEWMA has smaller variability and it allows more smoothing of the data with no compromise in the sensitivity of detecting shifts in the process mean. It also shifts the range of the design parameters for optimal ARL to larger values as compared with EWMA schemes. Such properties are more desirable for some industrial processes.
International Journal of Quality & Reliability Management – Emerald Publishing
Published: Jun 1, 1992
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