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Using Random Forest to Learn Imbalanced Data

Author(s): Chen, Chao; Liaw, Andy; Breiman, Leo
Report ID: 666
Date issued: July 2004

666.pdf (PDF)

Abstract: In this paper we propose two ways to deal with the imbalanced data classification problem using random forest. One is based on cost sensitive learning, and the other is based on a sampling technique. Performance metrics such as precision and recall, false positive rate and false negative rate, $F$-measure and weighted accuracy are computed. Both methods are shown to improve the prediction accuracy of the minority class, and have favorable performance compared to the existing algorithms.