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Line 235: ===Variance reduction=== Introduced in CART,<ref name="bfos"/> variance reduction is ofte Introduced in CART,<ref name="bfos"/> variance reduction is often employed in cases where the target variable is continuous (regression tree), meaning that use of many other metrics would first require discretization before being applied. The variance reduction of a node {{mvar\|N}} is defined as the total reduction of the variance of the target variable {{mvar\|Y}} due to the split at this node: :<math>

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