Fig. 3
From: A nomogram to predict conversion of laparoscopic surgery to laparotomy for Choledocholithiasis
Discrimination and validation of the nomogram. A and B ROC curves of the nomogram for the training and validation groups, respectively. C and D Calibration plots for the nomogram in the training and validation groups, respectively. In the calibration plot, the x-and y-axis represents the nomogram-predicted and the actual probabilities, respectively. ROC, receiver operating characteristic; AUC, area under curve; CI, confidence interval