Efficient estimation of hydrolyzed polyacrylamide (HPAM) solution viscosity for enhanced oil recovery process by polymer flooding | Oil & Gas Science and Technology

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Table 4

Statistical parameters of the proposed models.

		R²	ARD	AARD	RMSE	min RD	max RD
MLP	Train	0.9841	−0.0508	3.48	0.0620	0.0125	25.43
	Test	0.9617	−0.1319	4.81	0.0901	0.1090	20.68
	All	0.9800	−0.0671	3.74	0.0685	0.0125	25.43
GA-RBF	Train	0.9285	−0.2548	6.73	0.1313	0.0232	19.87
	Test	0.8801	−3.4229	8.82	0.1626	0.2560	21.85
	All	0.9188	−0.8916	7.15	0.1382	0.0232	21.85
	Train	0.9687	−0.4695	3.15	0.0877	0.0156	15.26
CSA-LSSVM	Test	0.8501	−6.1658	10.64	0.1822	0.0996	87.45
	All	0.9460	−1.6144	4.66	0.1132	0.0156	87.45
	Train	0.9773	−0.1700	4.06	0.0740	0.0038	23.73
CHPSO-ANFIS	Test	0.9575	0.2008	5.05	0.0955	0.2521	27.15
	All	0.9736	−0.0955	4.26	0.0788	0.0038	27.15
	Train	0.9869	−0.0755	2.77	0.0562	0.0031	14.12
CMIS	Test	0.9627	−1.2070	4.19	0.0885	0.0570	24.26
CMIS	All	0.9826	−0.3029	3.05	0.0640	0.0031	24.26

Determination coefficient:

Average relative deviation:

Average absolute relative deviation:

Root mean square error:

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