Table 7.

Statistical Parameters for External Validation of Three Proposed Models

Statistical Criteria	MLR	ANN	SVM
${\mathrm{R}}^2>0.6$	0.642	0.674	0.677
$(R^2-R_0^2)∕R^2<0.1$	0.000	0.003	0.003
$0.85\le \mathrm{K}\le 1.15$	0.988	0.988	0.987
$R_m^2>0.5$	0.633	0.644	0.644