Research Article
Geochemical Characterization of Spring Waters in the Crati River Basin, Calabria (Southern Italy)
Table 2
Results of the cross-validation for the different subzones and the different variables.
| Subzones | Variable | Model | ME | MSDR |
| Pollino Massif | Calcium | Circular | -0.025 | 0.940 | Magnesium | Exponential | -0.020 | 0.963 | Sodium | Spherical | -0.013 | 1.092 | Potassium | Gaussian | 0.001 | 0.786 | Chloride | Exponential | -0.017 | 1.078 | Sulphate | Exponential | -0.065 | 1.009 | Nitrate | Exponential | 0.015 | 0.945 | Alkalinity | Gaussian | -0.016 | 1.249 | Hardness | Exponential | 0.018 | 0.866 | Conductivity | Spherical | -0.017 | 0.947 |
| Coastal Chain | Calcium | Gaussian | -0.049 | 1.214 | Magnesium | Gaussian | -0.106 | 1.440 | Sodium | Gaussian | -0.048 | 0.920 | Potassium | Gaussian | -0.033 | 1.224 | Chloride | Gaussian | 0.000 | 0.812 | Sulphate | Exponential | -0.060 | 1.583 | Nitrate | Spherical | -0.117 | 1.381 | Alkalinity | Exponential | -0.083 | 1.062 | Hardness | Circular | -0.068 | 1.327 | Conductivity | Exponential | -0.109 | 1.266 |
| Mt. Cocuzzo | Calcium | Exponential | 0.021 | 0.784 | Magnesium | Exponential | -0.002 | 1.100 | Sodium | Circular | 0.024 | 0.941 | Potassium | Exponential | 0.017 | 0.984 | Chloride | Gaussian | 0.009 | 0.857 | Sulphate | Gaussian | 0.052 | 0.875 | Nitrate | Exponential | 0.008 | 0.959 | Alkalinity | Gaussian | -0.011 | 1.015 | Hardness | Circular | 0.007 | 0.775 | Conductivity | Gaussian | 0.000 | 1.044 |
| Serre Area | Calcium | Gaussian | -0.016 | 0.505 | Magnesium | Gaussian | -0.022 | 0.222 | Sodium | Exponential | -0.006 | 1.221 | Potassium | Gaussian | -0.017 | 0.385 | Chloride | Gaussian | -0.035 | 0.536 | Sulphate | Gaussian | -0.023 | 0.201 | Nitrate | Gaussian | 0.036 | 0.484 | Alkalinity | Gaussian | -0.022 | 0.152 | Hardness | Circular | 0.076 | 0.977 | Conductivity | Gaussian | -0.023 | 0.150 |
| Sila Massif | Calcium | Exponential | -0.041 | 1.045 | Magnesium | Exponential | -0.027 | 1.082 | Sodium | Exponential | -0.013 | 1.079 | Potassium | Gaussian | 0.022 | 1.050 | Chloride | Circular | 0.001 | 1.071 | Sulphate | Gaussian | 0.008 | 1.019 | Nitrate | Gaussian | 0.033 | 0.891 | Alkalinity | Exponential | -0.035 | 0.996 | Hardness | Exponential | -0.019 | 1.222 | Conductivity | Gaussian | 0.017 | 1.086 |
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