
CRITERION
FPE  Crossvalidation "internal" criterion.
FPE=SUM(Y_{calc}Y_{exp})^{2}(N+n)/(nN).
Y_{calc} and Y_{exp} are the calculated and target values, n is the number of observations in the data set, and N is the number of terms in the model.
The model is optimised to calculate a minimum value of this criterion for the training set.
RR  External VALIDATION set will be used.
RR=SUM(Y_{calc}Y_{exp})^{2}/n, where n is the number of observations in the external set.
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