Fig. 3.

Ranking of LASSO-based neuroimaging feature selection. For each significant model, the frequency with which each feature was selected (coefficient different from zero) across all outer CV folds in 1000 repetitions of LASSO regression is shown. The features have been reordered based on the occurring average frequencies. Red bars indicate the frequency with which the corresponding coefficient was positive (direct association with the neuropsychological scores) – whereas blue bars, the frequency with which the corresponding coefficient was negative (inverse association with the neuropsychological scores).