The capability index (Cpk) calculates the percentage of items being produced within specifications.

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The capability index (Cpk) measures the ability of a process to produce items within specifications, but it does not calculate the percentage of items being produced within specifications. Cpk calculates the variability of the process compared to the specifications and provides a numerical value that indicates how far the process is from being able to consistently produce items within those specifications.

The Capability Index (Cpk) Calculates the Percentage of Items Being