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
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