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. Author manuscript; available in PMC: 2012 Sep 12.
Published in final edited form as: J Stat Theory Pract. 2010 Dec 1;4(4):845–855. doi: 10.1080/15598608.2010.10412022

Table 3.3.

The means (mean), standard deviations (s.d.) and the proportions (Prop.) of significant estimators at α = 0.05 level from 1000 simulations with a censoring rate of 50% and new risk factor effect with β̂2 = 1, evaluated at time points 4, 5, 6, and 7.

Time tdNRI NRI tdIDI IDI

Mean s.d. Prop. Mean s.d. Prop. Mean s.d. Prop. Mean s.d. Prop.

4 0.900 0.161 97% 0.421 0.075 100% 0.006 0.002 97% 0.015 0.008 58%
5 0.865 0.229 87% 0.385 0.077 100% 0.005 0.002 82% 0.013 0.007 52%
6 0.887 0.348 68% 0.378 0.076 100% 0.004 0.002 58% 0.012 0.008 47%
7 0.896 0.523 58% 0.376 0.076 100% 0.003 0.001 37% 0.012 0.008 52%