Table 2.

Mean c-indices of Cox and Survival Forest all-cause mortality models on validation and test sets

Model	Val/Ts	Mean c-index (standard error)
ElasticNet Cox regression	Test	0.81 (0.026)
	Validation	0.79 (0.008)
L1 regularized Cox regression	Test	0.77 (0.040)
	Validation	0.79 (0.012)
L2 regularized Cox regression	Test	0.79 (0.030)
	Validation	0.79 (0.008)
Standard Cox regression	Test	0.79 (0.034)
	Validation	0.79 (0.008)
Conditional survival forest	Test	0.81 (0.030)
	Validation	0.79 (0.007)
Extra survival trees	Test	0.80 (0.033)
	Validation	0.80 (0.008)
Random survival forest	Test	0.81 (0.025)
	Validation	0.79 (0.009)