Machado, Marcela A.G.; Costa, Antonio F.B. - In: International Journal of Production Economics 114 (2008) 1, pp. 134-148
We propose a new statistic to control the covariance matrix of bivariate processes. This new statistic is based on the sample variances of the two quality characteristics, in short VMAX statistic. The points plotted on the chart correspond to the maximum of the values of these two variances. The...