A Sum of Squares Generally Weighted Moving Average Control Chart |
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Authors: | Chi-Jui Huang |
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Institution: | Department of International Trade, Jinwen University of Science and Technology, New Taipei City, Taiwan |
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Abstract: | In this article, we propose a new control chart called the sum of squares generally weighted moving average (SS-GWMA) control chart to simultaneously detect both the increase and decrease in the mean and/or variability. This new scheme is compared with the sum of squares exponentially weighted moving average (SS-EWMA) control chart. A simulation study is conducted to show that SS-GWMA control charts outperform SS-EWMA charts, in terms of the average run length (ARL), standard deviation of run length (SDRL), and diagnostic abilities. The design of SS-GWMA control charts is also discussed. |
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Keywords: | SS-EWMA control chart SS-GWMA control chart ARL SDRL Simulation |
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