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. 2016 Dec 16;27(8):3372–3382. doi: 10.1007/s00330-016-4691-x

Fig. 2.

Fig. 2

Area under the ROC curve (AUC) (a) and accuracy (b). The error bars show the standard deviation of 50 iterations of fourfold cross-validation. An asterisk (*) indicates a significant improvement over the classification using VBM features only (permutation test, p ≤ 0.05)