Table 4.

Description of the best-fitted variogram model developed for the groundwater quality parameters

Parameters	Best-fit model	Nugget	Sill	Nugget/ sill	ASE	RMSE	MSE	RMSSE
GWQI	Circular	0.817	1.012	0.807	193.923	91.515	0.025	0.546
	Spherical	0.818	0.989	0.827	194.980	91.52	0.025	0.545
	Exponential	0.819	0.957	0.855	197.979	91.51	0.031	0.532
	Gaussian	0.835	1.035	0.806	191.829	91.43	0.023	0.548
EWQI	Circular	0.081	0.097	0.835	54.696	55.801	−0.042	1.062
	Spherical	0.081	0.095	0.852	54.79	55.779	−.0419	1.060
	Exponential	0.083	0.092	0.902	55.366	55.482	−0.46	1.050
	Gaussian	0.082	0.101	0.811	54.354	55.369	−0.040	1.049

RMSE root mean square error, MSE mean standardized error, RMSSE root mean square standardized error, ASE average standard error