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Bias and standardized mean-squared-error (SMSE) performance for estimating VIMP standard error from RF-R (RF-regression) simulations. In total there are 240 variables (12 simulations, p = 20 variables in each simulation). These 240 variables have been stratified into 6 groups based on 10, 25, 50, 75, and 90th percentiles of true finite VIMP. Extreme right boxplots labeled “ALL” display performance for all 240 variables simultaneously.
