The Psychology of Quality and More
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The Psychology of Quality and More |
Calculation detail for defective (np) Control ChartsQuality Tools > Tools of the Trade > Calculation detail for defective (np) Control Charts
The np-chart is much simpler than the p-chart as the number of items in each subgroup is the same. Additional calculation thus only needs averaging of the number defective and proportion defective, plus a relatively simple calculation for control limits.
Calculation for np-chart
Next time: Calculation detail for defects (u) Control Charts
This article first appeared in Quality World, the journal of the Chartered Quality Institute
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