I've computed some variable measures using the packages, gbm, randomForest and party. I develop binary classification models predicting survival in cancer patients. Although the gbm package, randomForest package and party package is well described in both CRAN files, vignettes and publications, they don't mention much about the x-axis scale or implications, other than that gbm normalizes the scale to 100. I obtained these results from random forest computed with party package (cforest function):
So the x-axes ranges from 0 to 0.03, which seems strange to an amateur like me. I guess these scales are arbitrary in a sense, but should I be worried? Does the scale matter at al?