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Slide 220 of 241

Notes:

Ppk vs. Cpk

In 1991, the ASQC/AIAG Task Force published the "Fundamental Statistical Process Control" reference manual, which shows the calculations for Cpk as well as Ppk. These should be used to eliminate confusion about calculating Cpk. So which value is best to report, Cpk or Ppk? Although they show similar information, they have slightly different uses.

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