Use T²-Generalized Variance Chart to simultaneously monitor whether the process location and the process variability of two or more related variables are in control. This chart is the multivariate counterpart to the Xbar-R, Xbar-S, and I-MR charts.
The points vary randomly around the center line and are below the upper control limit for both charts. No trends or patterns are shown. The process location and process variability of the plastic product strength are stable.
To create a T2-generalized variance chart, choose .
If variables are not correlated, use Xbar-R Chart, Xbar-S Chart, or I-MR Chart.