Calculates the cross-validated AUC (concordance) from a "cv.grpsurv" object.
For S3 method compatibility.
The area under the curve (AUC), or equivalently, the concordance
statistic (C), is calculated according to the procedure outlined in
the reference below. This calls the
survival package, except the cross-validated linear
predictors are used to guard against overfitting. Thus, the values
AUC.cv.grpsurv will be lower than those
you would obtain with
survConcordance if you fit the full
van Houwelingen H, Putter H (2011). Dynamic Prediction in Clinical Survival Analysis. CRC Press.
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