Cpk vs Ppk - Cp vs Pp

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Cp, Cpk vs Pp, Ppk

Use Cp, Cpk when you have a sample and are testing the potential capability of a process to meet customer needs. Cp Cpk use sigma estimator.

Use Pp, Ppk when you have the total population and are testing the performance of a process to meet customer needs. Pp, Ppk use standard deviation.

For example, if you test a sample of 10 widgets from a batch of 100 widgets:

• Use Cp, Cpk to measure and make a statement about the whole batch of 100 widgets.
• Use Pp, Ppk to measure and make a statement about just the 10 widgets you measured.

Other Resources

• Cp Cpk Formula
• Pp Ppk Formula
• QI Macros Histogram with Cp Cpk and Pp ppk
• QI Macros Cp Cpk Template

The histogram with Cp Cpk, Pp Ppk and other metrics is just one of the tools included in the QI Macros for Excel SPC Software for Excel.

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