Fig. 2.

Receiver operating characteristic plot for all Alzheimer's disease patients, mild AD, and moderate AD versus control for elastic net classification with nested cross validation, for grey matter density (GMD), white matter density (WMD), fractional anisotropy (FA), mean diffusivity (MD), full correlation between independent components (FC), and regularised partial correlation between independent components (PC). Multimodal represents the best combination from step 5 of our stepwise multimodal procedure (GMD, WMD, FA, MD, and PC). The diagonal line represents random classification performance.