Model fitting and cross-validation results for scaled brain volume
| Polynomial Regression | ||||
|---|---|---|---|---|
| Polynomial (Age3) | Polynomial (Age3) + Sex | Polynomial (Age3) + Scanner | Polynomial (Age3) + Sex + Scanner | |
| R2 | 0.828 | 0.841 | 0.831 | 0.844 |
| Adjusted R2 | 0.823 | 0.835 | 0.823 | 0.835 |
| RMSE | 0.927 | 0.891 | 0.919 | 0.884 |
| Cross-validation (LOOCV) | ||||
| RMSE | 0.954 | 0.925 | 0.962 | 0.932 |
| RMSE increasea | 2.9% | 3.8% | 4.7% | 5.4% |
↵a Percentage increase in RMSE after one performs LOOCV compared with the non-cross-validated model.