Computer program for calculating the p‐value in testing process capability index Cpmk

Abstract

Abstract Many process capability indices, including Cp, Cpk, and Cpm, have been proposed to provide numerical measures on the process potential and performance. Combining the advantages of these indices, Pearn et al. (1992) introduced a new capability index called Cpmk, which has been shown to be a useful capability index for processes with two‐sided specification limits. In this paper, we implement the theory of a testing hypothesis using the natural estimator of Cpmk, and provide an efficient Maple computer program to calculate the p‐values. We also provide tables of the critical values for some commonly used capability requirements. Based on the test we develop a simple step‐by‐step procedure for in‐plant applications. The practitioners can use the proposed procedure to determine whether their process meets the preset capability requirement, and make reliable decisions. Copyright © 2002 John Wiley & Sons, Ltd.

Cite this work

No public copy is stored for this record, so only the metadata is cited.

Stored only when both papers are in the corpus — 45 citations exist upstream.

Papers that cite the same references — the relational fallback while embeddings are still backfilling.