Hey all,

In order to test if a marker is a risk factor, I built two models (using cox
proportional hazard model). One model included this marker, and the other is
not.

Then, I use R package risksetROC to test how much predictive value did the
marker add to this model. I get two C statistics by analyzing the linear
predictors of the two models into this package.

The qustion is How to test if two C statistics are significantly different?

Your help will be greatly appreciated!

Yujie

	[[alternative HTML version deleted]]

