Chunk #107 — Further Application Examples — Random Forests

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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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The permutation importances for all 105 variables are displayed in Figure 10. The effects of the two artificially modified genes can be clearly identified. With respect to the remaining variables, a conservative strategy for exploratory screening would be to include all genes whose importance scores exceed the amplitude of the largest negative scores (that can only be due to random variation) in future studies.