I am using the rcorr.cens function from the Hmisc package and the time-dependent ROC curve obtained using tdrocc in the survcomp package.

I understand that the C statistic from rcorr.cens has to be subtracted from 1 if high values of the risk variable lower survival.
Given that I wonder what the connection is between that C statistic and the AUC from the tdrocc object.  If they are substantially different are there any views on which one is to be preferred ?

Many thanks in advance

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