Table 5.
Assessment of final model fit.
| Performance measure | Final predictive model | Internal validation∗ |
|---|---|---|
| Global measure of goodness of fit | ||
| Brier | 0,17 | 0,18 |
| R 2 (Nagelkerke) | 0,13 | 0,10 |
| Discrimination | ||
| AUC = C stat (95% CI) | 0,68 (0,63–0,75) | 0,67 |
| Somers' D index | 0,36 | 0,34 |
| Discrimination slope | 1,00 | 0,90 |
| Calibration | ||
| Hosmer-Lemeshow goodness-of-fit test (χ 2, p value) | 6,29 (0,39) | |
| Unreliability index U | −0,005 | 0,004 |
| Quality index Q | 0,09 | 0,06 |
| Maximal error | <0,001 | 0,04 |
| Mean squared error | 0,00061 | 0,00057 |
∗Evaluated by bootstrapping method (number of resampling, B = 1000); the optimism corrected indices values.