Simulation results for different values of the smoothing parameter.

Comparison of the discriminatory power resulting from the gradient boosting approach when applying different values of the smoothing parameter . Numbers refer to to the median value and interquartile range (in parentheses) of the final on 100 simulation runs. The amount of pre-selected genes is denoted as , is the size of the training samples and cens. refers to the censoring rate. We recommend to use the value , which is also the default value of the new Cindex family for the R add-on package mboost.