Fig. 6

Performance of SVM models. a The ROC curves of SVM and SMOTE-SVM models in training and SMOTE-training sets, respectively. b The ROC curves of SVM and SMOTE-SVM models in validation set. c The performance of SVM and SMOTE-SVM models in training and SMOTE-training sets, respectively. d The performance of SVM and SMOTE-SVM models in validation set. ROC: receiver operating curve; AUC: area under the ROC curve; NPV: negative predictive value; PPV: positive predict value; SVM: support vector machine; SMOTE: synthetic minority over-sampling technique