Statistics How To

Cpk

Process Capability Analysis >

Cpk stands for process capability index, and refers to the capability a particular process has of achieving output within certain specifications. In manufacturing, it describes the ability of a manufacturer to produce a product that meets the consumers expectations, within a tolerance zone.

The equation for Cpk is [minimum(mean – LSL, USL – mean)] / (0.5*NT), where NT stands for natural tolerance, LSL for lower specification limit and USL for upper specification limit.

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