Decision tree regression is a fundamental technique that can be used by itself, and is also the basis for powerful ensemble techniques (a collection of many decision trees), notably, AdaBoost ...

The CART model began with a single node called the root node, which was recursively divided into subsequent decision nodes, with each split maximizing impurity reduction quantified by the Gini index.

Methods: A decision tree was constructed around the choice of adjuvant chemotherapy with hormone therapy vs. hormone therapy alone for a 40-year old patient with a LN-, ER+ tumor (TreeAge Pro). The ...