When using the CART algorithm, the Gini index is used in the classification tree, however in a regression tree, _____ is used to measure impurity.
A) mean percentage error
B) mean squared error
C) mean absolute deviation
D) mean absolute percentage error

Question

Quizplus · Accepted Answer

In a regression tree, the mean squared error (MSE) is used to measure impurity. This is because MSE provides a clear and differentiable metric for evaluating the variance of the continuous target variables within each node, which is essential for optimizing the tree structure.

When Using the CART Algorithm, the Gini Index Is Used