Chunk #80 — The Methods — Variable Importance

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An introduction to recursive partitioning: rationale, application, and characteristics of classification and regression trees, bagging, and random forests.

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As opposed to that, ensembles of trees are not easy to interpret at all, because the individual trees in them are not nested in any way: Each variable may appear at different positions, if at all, in different trees, as depicted in Figures 6 and 7, so that there is no such thing as an “average tree” that could be visualized for interpretation.