Control chart used to monitor shifts in the process mean and variability for multivariate data. This paper aims to monitor process variability through chart. Process variability observed by used the determinant of the sample covariance matrix, which is called |S|. The result of this paper show that the improved chart is more sensitive to shifts in the process variability. The standard chart has a bigger ARL than the improved chart by simulation.
Topics
Covariance and correlation
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