A REVIEW OF MULTIVARIATE CONTROL CHARTS

A review of the literature on control charts for multivariate quality control (MQC) is given, with a concentration on developments occurring since the mid-1980s. Multivariate cumulative sum (CUSUM) control proc edures and a multivariate exponentially weighted moving average (EWMA) control chart are reviewed and recommendations are made regarding the ir use. Several recent articles that give methods for interpreting an out-of-control signal on a multivariate control chart are analyzed and discussed. Other topics such as the use of principal components and r egression adjustment of variables in MQC, as well as frequently used a pproximations in MQC, are discussed.