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The dependent variable, <math>Y</math>, is the target variable that we are trying to understand, classify or generalize. The vector <math>\textbf{x}</math> is composed of the features, <math>x_1, x_2, x_3</math> etc., that are used for that task.
[[File:Cart tree kyphosis.png|thumb|
alt=Three different representations of a regression tree of kyphosis data|
An example tree which estimates the probability of
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