Illustration of rankings of variables based on any of the two Random Forest (RF) parameters of importance (panels in the lower triangle of the grid showing distribution of rankings of all predictor variables with black dots along a blue trend line) as well as correlation coefficient across rankings of any two parameters (panels in the upper triangle of the grid). It is shown that all RF parameters of importance were found to have very high correlations among each other, suggesting high reliability of each of these parameters to rank the importance of variables for group classification.
