Publication date: 04/12/2021

The T2 value for the ith observation is computed as follows:

where tij = X score for the ith row and jth extracted factor, p = number of extracted factors, and n = number of observations used to train the model. If validation is not used, n = total number of observations.

The control limit for the T2 Plot is computed as follows:

((n-1)2/n)*BetaQuantile(0.95, p/2, (n-p-1)/2)

where p = number of extracted factors, and n = number of observations used to train the model. If validation is not used, n = total number of observations. See Tracy et al. (1992).

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