Hi Stella,
A decision tree is a tree in which every node is either a leaf node or a decision node. This tree takes an input an object and outputs some decision. All Paths from root node to the leaf node are reached by either using AND or OR or BOTH. The tree is constructed using the regularities of the data. The decision tree is not affected by Automatic Data Preparation.
This is quite simple and precise answer. For more info , you can download E BOOK - THE MULTIDIMENSIONAL DATA MODELING TOOLKIT available at [ Decision Tree Algorithm|http://www.amazon.com/Multidimensional-Data-Modeling-Toolkit-Intelligence/dp/0981775306]
Bluesky
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