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Comparison of Gini contrast ranking and univariate rankings for all 5 subjects averaged over all classes: classification accuracy using the top ranked voxels. Three classifiers (SVM-LIN, SVM-RBF, and RF) exhibit consistent differences when trained on the selected voxels. The curves show the AUC for all classes, and all subjects. Dotted lines show subject-specific accuracy; solid lines show the average accuracy across subjects.
