[R] Classification of Imbalanced Data

[portnoy@supereva.it]

Hi,
I'm looking to perform  a classification analysis on an imbalanced data 
set  using random Forest and I'd like to reproduce the weighted random 
forest analysis proposed in the Chen, Liaw & Breiman paper "Using Random 
Forest to Learn Imbalanced Data"; can I use the R package randomForest 
to perform such analysis? What is the easiest way to accomplish this task?
Thanks,
Paolo Sonego