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 † | 0.79 (0.766; 0.816) | 0.79 (0.766; 0.816) | 0.82 (0.788; 0.839) | 0.78 (0.780; 0.785) | 0.78 (0.780; 0.785) |
C-index within clusters ‡ | 0.80 (0.077) | 0.80 (0.077) | 0.80 (0.077) | 0.79 (0.031) | 0.79 (0.031) |
Calibration intercept* | 0.00 | 0.02 | 0.00 | 0.04 | 0.07 |
Calibration intercept* within clusters ‡ | -0.02 (0.442) | -0.00 (0.453) | 0.00 (0.000) | 0.01 (0.494) | 0.05 (0.500) |
Calibration slope | 1.00 | 0.97 | 1.05 | 0.96 | 0.92 |
Calibration slope within clusters ‡ | 1.05 (0.090) | 1.01 (0.092) | 1.06 (0.000) | 1.00 (0.022) | 0.96 (0.021) |