A T2 chart indicates when a process is out of control, but it does not provide information on which variable or set of variables is out of control. However, Minitab can decompose the T2 statistic to find out each variable's contribution to the T2 statistic. Minitab uses the F distribution to test the significance of the out-of-control points. Minitab indicates which points are out of control in the Session window, along with the p-value for each significant variable. See Example of T2 chart.
You can store the decomposed T2 values.
Note |
Minitab can perform decomposition only when there are two or more observations in an stage. |