Year | Parameters used by method | Prediction errors | ||||||
Interpolation method | Kernel function | P | Search form | Optimizer parameter | Number of neighbors | Mean | Mean square error | |
1973 | IDW | n.a | 5.5836 | One sector | n.a | 15 | −0.254 | 4.827 |
| Global polynomial interpolation | n.a | 3 |
| n.a |
| 0.0618 | 21.26 |
| Local polynomial interpolation | n.a | 2 | One sector | n.a | 548 | −0.255 | 1.70 |
| Radial basis function | Completely regularized spline | n.a | One sector | 0.003 | 15 | −0.017 | 1.245 |
|
| Spline with tension | n.a | One sector | 0.001 | 15 | −0.069 | 3.568 |
|
| Multiquadratic | n.a | One sector | 0 | 15 | −0.045 | 2.893 |
|
| Inverse multiquadratic | n.a | One sector | 1607 | 15 | −0.115 | 2.698 |
|
| Thin plate spline | n.a | One sector | 1.00E+20 | 15 | −0.0299 | 1.908 |
| Kriging | Spherical semivariogram model | n.a | 4 sectors | n.a | 15 | −0.0658 | 2.895 |