Fig. 3.

Flow diagram outlining the feature selection validation strategy used in the study. CFS, correlation features selection; ALL, set containing all the features; SEL_TZ, subset of feature selected for the TZ; SEL_PZ, subset of feature selected for PZ; AUC_ALLPZ, area under the curve obtained on PZ using all the features; AUC_ALLTZ, area under the curve obtained on TZ using all the features; LR, linear regression; FFNN, feed-forward neural network; SVM, support vector machine; NB, naïve Bayes; RF, random forest, AUC_SELPZ, area under the curve obtained on PZ obtained using the selected feature; AUC_SELTZ, area under the curve obtained on TZ obtained using the selected feature