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Table 3 Means and standard deviations of the estimates of C for a trichotomized variable

From: Polychotomization of continuous variables in regression models based on the overall C index

  true C
n 0.650 0.750 0.850
10 0.671 ± 0.065 0.759 ± 0.057 0.854 ± 0.039
25 0.658 ± 0.042 0.754 ± 0.036 0.851 ± 0.024
50 0.654 ± 0.030 0.752 ± 0.025 0.851 ± 0.017
100 0.652 ± 0.022 0.751 ± 0.017 0.850 ± 0.012
200 0.651 ± 0.015 0.751 ± 0.012 0.850 ± 0.008
500 0.651 ± 0.010 0.750 ± 0.008 0.850 ± 0.005
  1. Two samples of the size n from N(0, 12) and N(0, ) are generated by Monte Carlo simulation and the pair consistency probability C for the optimal trichotomized points is calculated by the parametric method. This step is iterated 10,000 times, producing means and standard deviations of C. The values of σ d are 1.898, 3.133 and 6.150 for the true values of C 0.650, 0.750 and 0.850, respectively.