A wald test for comparing multiple capability indices

Norma F. Hubele, Abdelaziz Berrado, Esma Gel

Research output: Contribution to journalArticle

22 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)304-307
Number of pages4
JournalJournal of Quality Technology
Volume37
Issue number4
DOIs
StatePublished - Oct 2005

Keywords

  • Capability Analysis
  • Flatness
  • Form Tolerance
  • One-Sided Specifications

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality
  • Strategy and Management
  • Management Science and Operations Research
  • Industrial and Manufacturing Engineering

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