If I calculate the C-index after 10-fold cross-validation based on Cox model, which statistic test should I used to compare two C-statistc values.I means I use cross-validation to obtain a predictive probability for each individual, then combine all the probabilities to calculate the C-index.If I get two C-index values(0.73 vs. 0.80) based on two different model, then how to test the difference is significant. Thanks
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