تصفح Mathematics, Statistics & Physics حسب المؤلف "Adegoke N.A."
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Enhancing the performance of the EWMA control chart for monitoring the process mean using auxiliary information
Adegoke N.A.; Abbasi S.A.; Dawod A.B.A.; Pawley M.D.M. ( John Wiley and Sons Ltd , 2019 , Article)When using control charts to monitor manufacturing processes, the exponentially weighted moving average (EWMA) control chart is useful for detecting persistent shifts in the process parameter. This paper proposes enhancements ... -
Multivariate coefficient of variation control charts in phase I of SPC
Abbasi S.A.; Adegoke N.A. ( 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
Adegoke N.A.; Smith A.N.H.; Anderson M.J.; Abbasi S.A.; Pawley M.D.M. ( 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 ...