Table 4. Prediction of ABC Total.
Correlation between ABC Total value and metal excretion using linear regression (no cross-validation & cross-validation) as well as nonlinear regression (cross-validation). Only the results for the highest R2 values are shown, but other combinations of metals frequently had similar results.
| # Variables | Linear Model | Nonlinear Model | |||
|---|---|---|---|---|---|
| Metal Combinations | Max R2 value | Metal Combinations | Max R2 value | ||
| No Cross-Validation | Cross-Validation | ||||
| 1 | Cs | 0.194 | 0.175 | Cs | 0.185 |
| 2 | Cs/Hg | 0.227 | 0.182 | Cs/Hg | 0.233 |
| 3 | As/Cs/Sn | 0.265 | 0.188 | Cs/Ni/Sn | 0.326 |
| 4 | As/Cs/Ni/Sn | 0.296 | 0.192 | As/Hg/Ni/Sn | 0.367 |
| 5 | As/Cs/Hg/Ni/Sn | 0.318 | 0.186 | Cs/Hg/Ni/Pb/Sn | 0.416 |
| 6 | As/Cs/Hg/Ni/Sn /W | 0.329 | 0.187 | Cd/Cs/Hg/Ni/Pb/Sn | 0.449 |
| 7 | As/Cs/Hg/Ni/Sn /Tl/W | 0.337 | 0.165 | As/Cd/Cs/Hg/Ni/Pb/Sn | 0.471 |
| 8 | As/Cs/Hg/Ni/Pb/Sn /Tl/W | 0.345 | 0.148 | As/Cd/Cs/Hg/Ni/Pb/Sn/Tl | 0.475 |
| 9 | Al/As/Cs/Hg/Ni/Pb/Sn/Tl/W | 0.345 | 0.118 | As/Cd/Cs/Hg/Ni/Pb/Sn/Tl/W | 0.406 |
| 10 | all | 0.345 | 0.062 | All | 0.327 |