Testing process capability using the index Cpmk with an application

W.l. Pearn, S. L. Yang, K. S. Chen, P. C. Lin

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Numerous process capability indices, including Cp, C pk, Cpm, and Cpmk, have been proposed to provide measures on process potential and performance. Procedures using the estimators of Cp, Cpk, and Cpm have been proposed for the practitioners to use in judging whether a process meets the capability requirement. In this paper, based on the, theory of testing hypothesis, we develop a step-by-step procedure, using estimator of C pmk for the practitioners to use in making decisions. Then, the proposed procedure is applied to an audio-speaker driver manufacturing process, to demonstrate how we may apply the procedure to actual data collected in the factory.

Original languageEnglish
Pages (from-to)15-34
Number of pages20
JournalInternational Journal of Reliability, Quality and Safety Engineering
Issue number1
StatePublished - 1 Jan 2001


  • Critical value
  • P-value
  • Process capability index
  • Testing hypothesis

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