Distinguishing between mean, variance and autocorrelation changes in statistical quality control

Distinguishing between mean, variance and autocorrelation changes in statistical quality control

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Article ID: iaor19951302
Country: United Kingdom
Volume: 33
Issue: 2
Start Page Number: 497
End Page Number: 510
Publication Date: Feb 1995
Journal: International Journal of Production Research
Authors: ,
Keywords: statistics: general
Abstract:

In order to enhance the probability of correct quality diagnosis, it is useful to be able to identify the statistical manner in which the quality signal has changed, i.e. identify change structure. Specifically the authors wish to distinguish between changes in mean, variance and lag one autocorrelation. Because these change structures yield significant similarities in their corresponding output, a multistage decision tree is necessary. A multistage classification system with a neural network and quadratic discriminant functions is used, where neural network output is an a priori distribution for the Bayesian quadratic discriminant function. Experimental results show that this multistage decision strategy performs significantly better than its single stage counterpart, with an overall success rate of 84%.

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