Table 5 Simulation results in a domain with ICC = 5%, Pearson correlation X1 and random effect 0.0, number of patients 100, number of centers 5
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 † | 0.82 (0.742; 0.889) | 0.82 (0.743; 0.888) | 0.84 (0.752; 0.913) | 0.77 (0.718; 0.779) | 0.77 (0.719; 0.779) |
C-index within clusters ‡ | 0.82 (0.100) | 0.82 (0.096) | 0.82 (0.096) | 0.77 (0.032) | 0.77 (0.032) |
Calibration intercept* | -0.00 | 0.00 | 0.01 | 0.02 | 0.06 |
Calibration intercept* within clusters ‡ | -0.00 (0.295) | -0.00 (0.319) | 0.01 (0.000) | -0.01 (0.537) | 0.03 (0.545) |
Calibration slope (overall) | 1.00 | 0.99 | 1.05 | 0.71 | 0.69 |
Calibration slope within clusters ‡ | 1.06 (0.100) | 1.01 (0.108) | 1.07 (0.000) | 0.74 (0.017) | 0.72 (0.018) |