Hi,   I am trying to get an AUC curve for the model and I used the code:   proc phreg data = stanlong plots=AUC rocoptions(method=ipcw iauc); model (start,stop)*dead2(0) = plant surg ageaccpt / ties = efron; run; But I got an error message from the system:   Neither concordance nor ROC analysis is performed with the START/STOP specification of time.     Is there a way to obtain the AUC when I run proc phreg with time-dependent covariates?   Many thanks!! ... View more