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Table 4

Training and testing statistics of SVM models

	Input combination	Training			Testing
	Input combination	R	RMSE	MAE	R	RMSE	MAE
SVM1	Na	0.737	1111.8	9.82	0.779	576.82	41.75
SVM2	Na, HCO₃	0.937	598.37	120.7	0.956	288.85	4.45
SVM3	Na, HCO₃, Ca	0.882	776.57	29.65	0.818	542.64	100.33
SVM4	Na, HCO₃, Ca, Mg	0.95	511.45	13.02	0.933	339.24	83.81
SVM5	Na, HCO₃, Ca, Mg, SO₄	0.958	471.78	7.25	0.953	274.56	13.83

	Input combination	Training			Testing
	Input combination	R	RMSE	MAE	R	RMSE	MAE
SVM1	Na	0.737	1111.8	9.82	0.779	576.82	41.75
SVM2	Na, HCO₃	0.937	598.37	120.7	0.956	288.85	4.45
SVM3	Na, HCO₃, Ca	0.882	776.57	29.65	0.818	542.64	100.33
SVM4	Na, HCO₃, Ca, Mg	0.95	511.45	13.02	0.933	339.24	83.81
SVM5	Na, HCO₃, Ca, Mg, SO₄	0.958	471.78	7.25	0.953	274.56	13.83