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. Author manuscript; available in PMC: 2014 Jan 5.

Published in final edited form as: Stat Methods Med Res. 2012 Jul 5;25(1):255–271. doi: 10.1177/0962280212451881

Simulation results for time-dependent ROC curves for Z alone (`'), for the sub-optimal linear combination of X and Z (`'), and for the optimal combination of X and Z (`') in settings (1) and (2). Summaries presented as the average estimated AUC across 1000 iterations (`AUC') and the average standard error obtained as the average standard deviation of estimates from 200 bootstrap samples (`SE').

Inline graphic — Simulation results for time-dependent ROC curves for Z alone (`'), for the sub-optimal linear combination of X and Z (`'), and for the optimal combination of X and Z (`') in settings (1) and (2). Summaries presented as the average estimated AUC across 1000 iterations (`AUC') and the average standard error obtained as the average standard deviation of estimates from 200 bootstrap samples (`SE').