Quality and Process Methods • Shewhart Control Charts • Statistical Details for the Control Chart Platform • Control Limits for UWMA Charts
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Control Limits for UWMA Charts
Control limits for UWMA charts are computed for each subgroup i as follows.
LCLi =
UCLi =
where:
w is the span parameter (number of terms in moving average)
ni is the sample size of the ith subgroup
k is the number of standard deviations
Xw is the weighted average of subgroup means
is the estimated process standard deviation

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Help created on 7/12/2018