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The Quality Loss Index QLI and Its Properties

The Quality Loss Index QLI and Its Properties Abstract This article investigates the quality loss index QLI proposed by Samajdwar et al. for normal variables. The probability distribution of QLI and its components are obtained. The first component represents a quality loss index for the process variability, while the second component represents a quality loss index for the shift in the process mean. Moreover, a method is derived allowing to estimate the nonconformance probability in either side of the target value for normal variables. Finally, an additive property of the quality loss index is established, which enables to define an composite quality loss index and use it within a continual process improvement strategy. The composite quality loss index indicates the process performance and identifies the parameter(s) which show a potential for improvement. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Economic Quality Control de Gruyter

The Quality Loss Index QLI and Its Properties

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Publisher
de Gruyter
Copyright
Copyright © 2011 by the
ISSN
1869-6147
eISSN
1869-6147
DOI
10.1515/eqc.2011.006
Publisher site
See Article on Publisher Site

Abstract

Abstract This article investigates the quality loss index QLI proposed by Samajdwar et al. for normal variables. The probability distribution of QLI and its components are obtained. The first component represents a quality loss index for the process variability, while the second component represents a quality loss index for the shift in the process mean. Moreover, a method is derived allowing to estimate the nonconformance probability in either side of the target value for normal variables. Finally, an additive property of the quality loss index is established, which enables to define an composite quality loss index and use it within a continual process improvement strategy. The composite quality loss index indicates the process performance and identifies the parameter(s) which show a potential for improvement.

Journal

Economic Quality Controlde Gruyter

Published: Sep 1, 2011

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