# Calculates AUC for cv.grpsurv objects

### Description

Calculates the cross-validated AUC (concordance) from a "cv.grpsurv" object.

### Usage

1 2 |

### Arguments

`obj` |
A |

`...` |
For S3 method compatibility. |

### Details

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 `survConcordance`

function
in the `survival`

package, except the cross-validated linear
predictors are used to guard against overfitting. Thus, the values
returned by `AUC.cv.grpsurv`

will be lower than those
you would obtain with `survConcordance`

if you fit the full
(unpenalized) model.

### Author(s)

Patrick Breheny

### References

van Houwelingen H, Putter H (2011). Dynamic Prediction in Clinical Survival Analysis. CRC Press.

### See Also

`cv.grpsurv`

,
`survConcordance`

### Examples

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