A Wald Test for Comparing Multiple Capability Indices

Norma F. Hubele · Abdelaziz Berrado · Esma S. Gel

26 citations0/0 files storedJournal of Quality Technology

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Advanced Statistical Process Monitoring Fault Detection and Control Systems Management Systems and Quality Improvement

Abstract

The capability index CPU is recommended for quality features with a unilateral specification of USL. Linearity, flatness, circularity and cylindricity are examples of such quality features. Here, a Wald statistic is developed for testing the equality of k CPU indices. Industrial data sets are used in illustrations. The procedure is extended for testing the equality of k CPL indices, where the index CPL is used to summarize process performance relative to a single lower specification limit.

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1986Process Capability Indices 2002Process Capability Indices—A Review, 1992–2000 1990Lower Confidence Limits on Process Capability Indices 1994SELECTING A BETTER SUPPLIER BY TESTING PROCESS CAPABILITY INDICES

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