Table 9 Evolution of the standard deviation of residuals for various GRNN models predicting F a and F v in the NP–RF case
Normalized profiles | F a | F v | |||
|---|---|---|---|---|---|
Number of parameters | Explanatory parameters | Standard deviation of residuals | Variance reduction | Standard deviation of residuals | Variance reduction |
All (5) | Depth + f 0 + V sm + C v + V s30 | 0.0055 | 99.74% | 0.0011 | 99.98% |
3 (best triplet) | f 0 + C v + V s30 | 0.012 | 98.7% | 0.0034 | 99.8% |
2 (best pair for Fa) | f 0 + C v | 0.0318 | 91.43% | 0.0172 | 95.7% |
2 (convenient pair) | f 0 + V s30 | 0.0592 | 70.28% | 0.0153 | 96.6% |
1 (best for Fa) | C v | 0.0783 | 48.02% | 0.0733 | 21.8% |
1 (best for Fv) | f 0 | 0.0944 | 24.44% | 0.048 | 66.4% |
1 (usual) | V s30 | 0.0926 | 27.3% | 0.0709 | 26.8% |
Initial σ | 0.1086 | 0.0829 | |||