[R] how to compare cross-validated C-index in Cox

[frank.chiang]

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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