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. 2020 Apr 14;15(4):e0231055. doi: 10.1371/journal.pone.0231055

Table 2. Training and testing accuracies of the ELM models in modeling soil temperature at different depths.

Input combination	Training			Testing
Input combination	RMSE (°C)	NSE	R²	RMSE (°C)	NSE	R²
5 cm
T	1.526	0.974	0.974	1.607	0.975	0.980
T, R_H	8.531	0.196	0.727	10.08	0.033	0.335
T, Rs, W	8.131	0.269	0.744	9.705	0.103	0.337
T, Rs, W, R_H	3.836	0.837	0.837	6.711	0.571	0.571
10 cm
T	1.265	0.980	0.980	1.190	0.984	0.986
T, R_H	8.129	0.210	0.708	9.339	0.048	0.312
T, Rs, W	7.663	0.298	0.762	8.693	0.175	0.312
T, Rs, W, R_H	4.167	0.792	0.792	7.110	0.448	0.461
50 cm
T	1.025	0.980	0.980	1.397	0.969	0.982
T, R_H	6.245	0.263	0.572	7.875	0.017	0.181
T, Rs, W	5.949	0.331	0.607	7.411	0.13	0.177
T, Rs, W, R_H	4.242	0.660	0.66	6.335	0.364	0.39
100 cm
T	4.276	0.455	0.455	5.149	0.356	0.459
T, R_H	5.492	0.102	0.102	7.201	-0.258	0.346
T, Rs, W	2.210	0.854	0.854	3.211	0.749	0.901
T, Rs, W, R_H	2.185	0.857	0.857	3.215	0.749	0.915