Chunk #55 — The Methods — How Do Classification and Regression Trees Work? — What is Wrong with Trees?

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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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Classification trees built on four bootstrap samples drawn from our original smoking data are displayed in Figure 5. Apparently, the effect of the variable friends_smoke is strong enough to remain present in all four trees, while the further splits vary strongly with the sample.