RF average variable importance score

Set the number B of bootstrap samples

Step 1. For k = 1 to B

Draw a bootstrap sample from the data, run RF and generate the ranking of variable importance.

Let ac.reli,k be the importance assigned to the ith immune predictor in the kth RF run.

Step 2. For each immune predictor, compute its average score $ac.re{l}_i=\frac{{\displaystyle {\sum }_{k=1}^{B}ac.re{l}_{i,k}}}{B}$

Step 3. Sort the ac.relis to generate the ranking of average importance scores