Table 2.

Best subset analysis to optimally chosen the input combination of EC in ML models.

	Combinations	R2%	R2-Ajd%	Cp	PC
1	ECt−1	0.474	0.473	90.660	0.528
2	Q/ECt−1	0.550	0.547	18.365	0.455
3	Q/ECt−4/ECt−1	0.563	0.560	6.770	0.443
4	Qt−2/Q/ECt−4/ECt−1	0.567	0.563	4.678	0.441
5	Qt−2/Q/ECt−4/ECt−2/ECt−1	0.569	0.564	4.741	0.441
6	Qt−2/Qt−1/Q/ECt−4/ECt−2/ECt−1	0.570	0.564	6.119	0.442
7	Qt−2/Qt−1/Q/ECt−4/ECt−3/ECt−2/ECt−1	0.570	0.563	8.000	0.444

Significant values are in bold.