Table 2 Apparent and test performance of the PONV models described in Table 1
From: Prediction models for clustered data: comparison of a random intercept and standard regression model
Apparent performance | Test performance | ||||
|---|---|---|---|---|---|
Standard model | Marginal risk calculation | Conditional risk calculation | Standard model | Marginal risk calculation | |
Harrell’s C-index † | 0.66 (0.014) | 0.66 (0.014) | 0.69 (0.013) | 0.68 (0.014) | 0.67 (0.014) |
C-index within clusters ‡ | 0.63 (0.089) | 0.62 (0.097) | 0.62 (0.097) | 0.72 (0.129) | 0.70 (0.127) |
Calibration intercept* | 0.00 | 0.01 | 0.00 | 0.13 | 0.14 |
Calibration intercept* within clusters ‡ | 0.01 (0.329) | -0.00 (0.385) | 0.00 (0.000) | 0.10 (0.339) | 0.11 (0.380) |
Calibration slope | 1 | 0.95 | 1.08 | 1.08 | 0.99 |
Calibration slope within clusters ‡ | 0.97 (0.189) | 0.94 (0.251) | 1.08 (0.000) | 1.06 (0.060) | 1.00 (0.027) |