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Multivariate coefficient of variation control charts in phase I of SPC
(
Springer London
, 2018 , Article)
Multivariate control charts are mostly available for monitoring the process mean vector or the covariance matrix. Recently, work has been done on monitoring the multivariate coefficient of variation (CV) in phase II of the ...
Shrinkage estimates of covariance matrices to improve the performance of multivariate cumulative sum control charts
(
Elsevier Ltd
, 2018 , Article)
Multivariate cumulative sum control charts require knowledge of the in-control process covariance parameters. Here, we show that the performance of the multivariate cumulative sum control charts for individual-observation ...