A Multivariate Process Variability Monitoring Based on Individual Observations

Maman Abdurachman Djauhari


In order to have a better understanding whether or not an additional observation has changed the covariance structure, a new statistic will be introduced. Under normality assumption, its asymptotic distribution will be presented and for practical purpose a chi-square approximation will be discussed. An industrial application in monitoring process variability will be presented to illustrate its advantage.

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DOI: http://dx.doi.org/10.5539/mas.v4n10p91

Modern Applied Science   ISSN 1913-1844 (Print)   ISSN 1913-1852 (Online)

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