E20-007 practice - PrepKeys

Q5 Single choice

You have fit a decision tree classifier using 12 input variables. The resulting tree used 7 of the 12 variables, and is 5 levels deep. Some of the nodes contain only 3 data points. The AUC of the model is 0.85.

What is your evaluation of this model?

A
The tree is probably overfit. Try fitting shallower trees and using an ensemble method.
B
The AUC is high, and the small nodes are all very pure. This is an accurate model.
C
The tree did not split on all the input variables. You need a larger data set to get a more accurate model.
D
The AUC is high, so the overall model is accurate. It is not well-calibrated, because the small nodes will give poor estimates of probability.