• Nonparametric multivariate covariance chart for monitoring individual observations 

      Adegoke, Nurudeen A.; Ajadi, Jimoh Olawale; Mukherjee, Amitava; Abbasi, Saddam Akber ( Elsevier , 2022 , Article)
      Parametric and nonparametric multivariate control charts that are proven very useful in monitoring the covariance matrix of multivariate normally or “nearly” normally distributed continuous datasets have been proposed in ...