N = the number of samples.

After normalization, the mean and standard deviation of every feature are equal to zero and one, respectively. Then, we can compute the characteristics of each feature and the cross-correlation coefficients between any pairs offeatures as follows:

(1) Interclass mean distance. For any two classes, (i = 1, 2,..., n1) and (j = 1,2,..., n2), the interclass mean distance is distk

(2) Intraclass variance. For each feature, we can compute intraclass variance as

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