oblique.tree (version 1.1.1)

oblique.split.writer: Internal function to Summarize Information about Oblique Splits

Description

Collates, rewrites and summarizes information about oblique splits.

Usage

oblique.split.writer(
	coefficients, 
	impurity, 
	child.left.T.F, 
	superclass.composition)

Arguments

coefficients

A (named) vector of coefficients of an oblique split. The first component is the intercept followed by each attribute in turn.

impurity

Impurity of this split.

child.left.T.F

A logical vector denoting allocation of observations to left child node.

superclass.composition

A record of the targets of the classification problem that lead to this ideal split.

Value

A list is returned with the following components,

impurity

Impurity of this split.

child.left.T.F

A logical vector denoting allocation of observations to left child node.

details

A list with coefficients, the coefficients of this split and superclass.targets, a record of the targets of the classification problem that lead to this ideal split.

variable

A string denoting the type of such a split, "" for oblique splits and a variable name for axis-parallel splits.

cutleft

A string expressing the left branch.

cutright

A string expressing the right branch.

Details

Variable selection can reduce full oblique splits to using only one attribute which are better represented as axis-parallel splits. This function handles this representational issue.