Quality and Process Methods • Control Chart Builder • Statistical Details for the Control Chart Builder Platform • Control Limits for p- and np-charts
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Control Limits for p- and np-charts
The lower and upper control limits, LCL, and UCL, respectively, are computed as:
p-chart LCL =
p-chart UCL =
np-chart LCL =
np-chart UCL =
where:
p is the average proportion of nonconforming items taken across subgroups
ni is the number of items in the ith subgroup

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Help created on 9/19/2017