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Variable selection using random forests
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DOI：10.1016/j.patrec.2010.03.014.png)
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Abstract
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This paper proposes, focusing on random forests, the increasingly used statistical method for classification and regression problems introduced by Leo Breiman in 2001, to investigate two classical issues of variable selection. The first one is to find important variables for interpretation and the second one is more restrictive and try to design a good parsimonious prediction model. The main contribution is twofold: to provide some experimental insights about the behavior of the variable importance index based on random forests and to propose a strategy involving a ranking of explanatory variables using the random forests score of importance and a stepwise ascending variable introduction strategy. (C) 2010 Elsevier B.V. All rights reserved.
Keywords:
Random forests
Regression
Classification
Variable importance
Variable selection
High dimensional data
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