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The np chart is used to evaluate process stability when counting the
number or fraction defective.
The np chart is useful when it's easy to count the number of defective
items and the sample size is always the same. Examples might include:
the number of defective circuit boards per 100 or errors per each sample
of 50 invoices.
Here is the formula used to calculate a np chart.
Conforms with ANSI/ASQC B1, B2, B3 1996
Other Resources
The np chart is just one of the tools included in the QI
Macros for Excel SPC Software for Excel.
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