Quality evaluation model using loss function for multiple S-type quality characteristics

W. M. Chan, R. N. Ibrahim, P. B. Lochert

Research output: Contribution to journalArticleResearchpeer-review

29 Citations (Scopus)


Most of the studies of quality system or product-quality assessment deal with a single quality characteristic to determine the quality loss. Products are often assessed on more than one quality characteristic. For this reason, different multivariate quality loss functions have been proposed. However, these loss functions only consider the nominal-the-best quality characteristics (N-type); they do not consider the condition when the quality characteristics are of the smaller-the-better (S-type). In this article, we present a quality evaluation model using loss function for multiple S-type quality characteristics. A numerical example is illustrated showing that using inappropriate loss functions will lead to inaccurate results that give either an underestimate or overestimate of the expected quality costs.

Original languageEnglish
Pages (from-to)98-101
Number of pages4
JournalInternational Journal of Advanced Manufacturing Technology
Issue number1-2
Publication statusPublished - 1 Jul 2005


  • Multivariate quality loss function
  • Nominal-the-best characteristic
  • Product quality
  • Smaller-the-better characteristic

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