A wald test for comparing multiple capability indices

Norma F. Hubele, Abdelaziz Berrado, Esma Gel

Research output: Contribution to journalArticle

21 Citations (Scopus)

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
StatePublished - Oct 2005

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Wald Test
Program processors
Specifications
Testing
Equality
Statistics
Specification Limits
Wald Statistic
Flatness
Linearity
Specification
Wald test
Capability index

Keywords

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

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Statistics and Probability
  • Management Science and Operations Research

Cite this

A wald test for comparing multiple capability indices. / Hubele, Norma F.; Berrado, Abdelaziz; Gel, Esma.

In: Journal of Quality Technology, Vol. 37, No. 4, 10.2005, p. 304-307.

Research output: Contribution to journalArticle

Hubele, NF, Berrado, A & Gel, E 2005, 'A wald test for comparing multiple capability indices', Journal of Quality Technology, vol. 37, no. 4, pp. 304-307.
Hubele, Norma F. ; Berrado, Abdelaziz ; Gel, Esma. / A wald test for comparing multiple capability indices. In: Journal of Quality Technology. 2005 ; Vol. 37, No. 4. pp. 304-307.
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