The impurity of a group of observations is based on the variance of the outcome value for the observations in the group for
A)regression trees.
B)time-series plots.
C)classification trees.
D)cumulative lift charts.

Question

Quizplus · Accepted Answer

In regression trees, the impurity of a group of observations is measured by the variance of the outcome value for the observations in the group. This measure, known as the sum of squared errors or SSE, is minimized when the group is split into two subsets that are as homogeneous as possible with respect to the outcome value.

The Impurity of a Group of Observations Is Based on the Variance