Estimation of non-conformance using the modified tolerance region

Shirley Anak Johnathan Tanjong, Raafat Nasr Ibrahim, Mali Abdollahian

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This paper presents a method for estimating the proportion of non-conformance for correlated multivariate normal quality characteristics. The modified tolerance region is employed such that the method is robust in estimating probability of product quality failing to meet customer specifications. The results obtained from this method can be applied for measuring process performance and for predicting external failure costs. We demonstrate the proposed method using an example and compare the results based on both the modified tolerance region and the original
tolerance region.
Original languageEnglish
Title of host publicationProceedings of the 4th International Workshop on Computer Science and Engineering
Place of PublicationSingapore
PublisherInternational Association of Computer Science and Information Technology
Pages1 - 5
Number of pages5
Publication statusPublished - 2015
EventInternational Workshop on Computer Science and Engineering (WCSE-Winter 2014) - , Hong Kong
Duration: 26 Dec 201428 Dec 2014
Conference number: 4th


WorkshopInternational Workshop on Computer Science and Engineering (WCSE-Winter 2014)
Abbreviated titleWCSE 2014-Winter
CountryHong Kong
OtherWorkshop Conducted at the International Conference on Mechatronics and Mechanical Design
Internet address


  • Correlated characteristics
  • Multivariate quality control
  • Proportion of non-conformance
  • Tolerance region

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