The top significant variables were also shown in a multi-way importance plot based on the relationships across three RF measures of importance, viz., the Gini decrease, the number of trees, and the p-value (Figure 2). A particular variable is deemed significant if that variable is used for splitting more often than that of a random chance. As listed in Table 3, the variables that were found to be important for group classification are: 14 DMN connections, two neuropsychological variables (the memory span and total correct scores of the forward condition of the VST), and all four impulsivity (BIS) scores.
