Dear List, If I build a model based on training set, and calculate the predictive AUC on test set using that model, how should I calculate the 95%CI for this predictive AUC using bootstrap method? The SE should be calculated on training set or test set, or combine them together? I feel confused about it. Thanks -- View this message in context: http://r.789695.n4.nabble.com/How-to-calculate-confidence-interval-using-bootstrap-tp4553863p4553863.html Sent from the R help mailing list archive at Nabble.com.