I am using logistic regression model (lrm) of package Design.

Can some one please tell me how to calculate the average Area Under Curve
(AUC) for n-fold cross-validation

The help for lrm function says to do cross validation like this

f <- lrm( cy ~ x1 + x2, x=TRUE, y=TRUE)
val <- validate.lrm(f, method="cross", B=5)

Now I dont know what to do with variable "val" to get the average AUC value.

thnx and regards,
nitin

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