LeafRates: Leafrates for the Nodes of an 'rpart' Tree

In ModTools: Building Regression and Classification Models

Leafrates for the Nodes of an 'rpart' Tree

Description

Return the frequencies of correct and wrong classifications in given node(s) in tabular form. The 'purity', denoting the relative frequency of correctly classified elements, is a useful information for the interpretation of regression and classification trees and a measure for its quality.

Usage

LeafRates(x)

## S3 method for class 'LeafRates'
plot(x, col = NULL, which = c("rel", "abs"),
                         layout = NULL, ylim = NULL, ...)

Arguments

x	fitted model object of class rpart.
col	color for the bars in the plot
which	one out of "rel" or "abs", denoting whether relative or absolute frequencies should be used for the plot.
layout	vector defining the layout
ylim	the y limits of the plot.
...	further arguments (not used).

Details

The result comprises absolute and relative frequencies per leaf.

Value

A list with 5 elements consisting of:

node	the node id (of the leaf)
freq	the absolute frequency of correct and wrong classifications
p.row	the relative frequency of correct and wrong classifications
mfreq	the total number of cases
mperc	the percentage of the sample in the leaf

Author(s)

Andri Signorell <[e-mail]>

See Also

Node, Rules

Examples

r.rp <- FitMod(Species ~ ., data=iris, fitfn="rpart")
LeafRates(r.rp)

plot(LeafRates(r.rp))

ModTools documentation built on Sept. 30, 2024, 9:12 a.m.