Control Limits for EWMA Charts

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r is the EWMA weight parameter (0 < r ≤ 1)

xij is the jth measurement in the ith subgroup, with j = 1, 2, 3,..., ni

ni is the sample size of the ith subgroup

k is the number of standard deviations

Xw is the weighted average of subgroup means

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Help created on 7/12/2018