lk_ratio_prune: Likelihood ratio for prune.
In brunaw/hebart: Hierachical Embedded Bayesian Additive Regression Trees

lk_ratio_prune

R Documentation

Likelihood ratio for prune.

Description

Likelihood ratio of the candidate tree and the previous tree, given that the action step was a prune.

Usage

lk_ratio_prune(old_tree, tree, current_node, pars, nodes_to_prune)

Arguments

`old_tree`	The previous tree.
`tree`	The current tree.
`current_node`	The current pruned node.
`pars`	The full list of parameters.
`nodes_to_prune`	The nodes to prune.

Details

For the likelihood ratio of the new pruned tree, we need to calculate an inversion of the one in the grow version. The value is based on the likelihood of all regions, given the tree and the parameters, for the new and the previous trees.