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ewmaplot Exponentially Weighted Moving Average (EWMA) Chart 11 UCL 10.8 USL 10.6 EWMA 10.4 10.2 10 9.8 LCL 9.6 9.4 LSL 9.2 0 5 10 15 20 Sample Number 25 30 Reference Montgomery, Douglas, Introduction to Statistical Quality Control, John Wiley & Sons 1991. p. 299. See Also xbarplot, schart 2-63