c Chart Formulas

c charts determine the stability of "counted" data when the opportunity is large compared to the actual number of defects ( e.g. injuries per month or falls per month).

Here is the formula used to calculate a c chart.

c chart formula

cᵢ = number of nonconformities found

Conforms with ANSI/ASQC B1, B2, B3 1996

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The c chart is just one of the tools included in the QI Macros for Excel SPC Software for Excel.


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