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University of Michigan - Ann Arbor

Linear Regression Model: 
$$ f(X) = \beta_0 + \sum_{j=1}^{p} X_j \beta_j $$
Regression Trees Model: 
$$ f(x) = \sum_{m=1}^{M} c_m · 1(x \in R_m) $$
Linear regression is a good choice if the relationship between predictive variables and response variables can be well fitted by linear models. On the other hand, the tree method is more appropriate if the relationship is highly nonlinear and complex. 


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