. 2017 Jul 6;5:2676. Originally published 2016 Nov 16. [Version 3] doi: 10.12688/f1000research.8231.3

Table 2. Heterogeneous ensemble of survival models used in sub challenge 1a of the Prostate Cancer DREAM Challenge.

All denotes the initial size of the ensemble, Pruned the size after pruning models with Harrell’s concordance index below 0.66, and Top 5% to the final size of the ensemble corresponding to the top 5% according the combined accuracy and diversity score in Algorithm 2.

	Configurations
Survival model	All	Pruned	Top 5%
Gradient boosted Cox model (tree) ^3, 27	1,728	936	56
Gradient boosted Cox model (least squares) ^3, 29	36	36	7
Random survival forest ²	24	24	24
Ranking-based survival SVM (clinical kernel) ^9, 26	13	3	3
Σ	1,801	999	90