R & Trees There are two tree libraries: tree: original

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R & Trees There are two tree libraries: tree: original rpart: New and used by Plant

Cost-Complexity Measure Cost-Complexity Measure (cp) 𝑅 𝛼 𝑇 =𝑅 𝑇 +𝛼 𝑇 Relative error (rel error) Related to R2: R2 = 1 – Relative error Complexity Measure: 𝑇 - Number of terminal nodes 𝛼 – Complexity parameter

R Parameters Rpart.control() Creates the parameters to control fit minsplit – minimum number of data points in a node before a split is tried cp – complexity parameter

If X>50 Value=1 Else Value=2

If (X>50) and (Y>50) Value=2 Else if (X<50) and (Y<50) Value=2 Else Value =1

Cross-Validation 10 fold Bootstrap