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for a process under statistical process control, a measure of process performance similar to process capability (Cp), but adjusted for any variation of the average process output from the stated target value for the process. In a typical process, process capability index is at best equal to process capability, but most commonly, it is less than process capability. A process capability index of at least 1.33 is a desirable objective. (The "pk" part of the abbreviation is written with subscript lowercase letters.)
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