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Table 3

Training and testing statistics of ANFIS models

	Input combination	Training			Testing
	Input combination	R	RMSE	MAE	R	RMSE	MAE
ANFIS1	Na	0.930	771.64	363.29	0.949	374.82	69.54
ANFIS2	Na, HCO₃	0.938	915.27	604.18	0.954	452.94	179.65
ANFIS3	Na, HCO₃, Ca	0.994	313.83	203.68	0.994	179.77	48.50
ANFIS4	Na, HCO₃, Ca, Mg	0.998	299.84	198.85	0.997	162.06	37.47
ANFIS5	Na, HCO₃, Ca, Mg, SO₄	0.998	183.76	112.51	0.997	108.63	27.77

	Input combination	Training			Testing
	Input combination	R	RMSE	MAE	R	RMSE	MAE
ANFIS1	Na	0.930	771.64	363.29	0.949	374.82	69.54
ANFIS2	Na, HCO₃	0.938	915.27	604.18	0.954	452.94	179.65
ANFIS3	Na, HCO₃, Ca	0.994	313.83	203.68	0.994	179.77	48.50
ANFIS4	Na, HCO₃, Ca, Mg	0.998	299.84	198.85	0.997	162.06	37.47
ANFIS5	Na, HCO₃, Ca, Mg, SO₄	0.998	183.76	112.51	0.997	108.63	27.77