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u charts determine
stability of "counted" data (e.g., errors per bill, dents in a
car door, etc.) when there can be more than one defect per unit and the
sample size varies.
Here is the formula used to calculate a u chart.
Conforms with ANSI/ASQC B1, B2, B3 1996
Other Resources
The u chart is just one of the tools included in the QI
Macros for Excel SPC Software for Excel.
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the FREE 30-day Evaluation copy of the QI Macros Excel SPC Software for Six Sigma
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