Table 4.

Coefficients of determination (R²).

ANN	Best	Worst	Average	Variance
a_1_6	0.9946	0.5487	0.7984	0.0124
a_1_10	0.9941	0.4990	0.8108	0.0160
a_1_20	0.9931	0.5613	0.8332	0.0157
a_2_6	0.9916	0.5353	0.7949	0.0121
a_2_10	0.9930	0.4638	0.8136	0.0175
a_2_20	0.9933	0.5342	0.8244	0.0162
b_1_6	0.9875	0.5460	0.8016	0.0129
b_1_10	0.9905	0.3505	0.8115	0.0202
b_1_20	0.9882	0.4226	0.8291	0.0160
b_2_6	0.9785	0.5119	0.7775	0.0132
b_2_10	0.9889	0.4935	0.8221	0.0132
b_2_20	0.9852	0.4492	0.8075	0.0245

Best values are underlined.