Simulation on control chart in monitoring the multivariate process variability Available to Purchase

Control chart used to monitor shifts in the process mean and variability for multivariate data. This paper aims to monitor process variability through $|S|$ 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 $|S|$ chart is more sensitive to shifts in the process variability. The standard $|S|$ chart has a bigger ARL than the improved chart by simulation.