Tree-Values: selective inference for regression trees
- URL: http://arxiv.org/abs/2106.07816v1
- Date: Tue, 15 Jun 2021 00:25:11 GMT
- Title: Tree-Values: selective inference for regression trees
- Abstract summary: A naive approach to inference that does not account for the fact that the tree was estimated from the data will not achieve standard guarantees.
We propose a selective inference framework for conducting inference on a fitted CART tree.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We consider conducting inference on the output of the Classification and
Regression Tree (CART) [Breiman et al., 1984] algorithm. A naive approach to
inference that does not account for the fact that the tree was estimated from
the data will not achieve standard guarantees, such as Type 1 error rate
control and nominal coverage. Thus, we propose a selective inference framework
for conducting inference on a fitted CART tree. In a nutshell, we condition on
the fact that the tree was estimated from the data. We propose a test for the
difference in the mean response between a pair of terminal nodes that controls
the selective Type 1 error rate, and a confidence interval for the mean
response within a single terminal node that attains the nominal selective
coverage. Efficient algorithms for computing the necessary conditioning sets
are provided. We apply these methods in simulation and to a dataset involving
the association between portion control interventions and caloric intake.
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