R: Cost-complexity Pruning of an Rpart Object

Cost-complexity Pruning of an Rpart Object

Usage

prune.rpart(tree, cp)

Arguments

`tree`	fitted model object of class `rpart`. This is assumed to be the result of some function that produces an object with the same named components as that returned by the `rpart` function.
`cp`	Complexity parameter to which the `rpart` object will be trimmed.

Description

Determines a nested sequence of subtrees of the supplied rpart object by recursively snipping off the least important splits, based on the complexity parameter (cp).

Value

A new rpart object that is trimmed to the value cp.

Examples

data(car.test.frame)
z.auto <- rpart(Mileage ~ Weight, car.test.frame)
zp <- prune.rpart(z.auto)
plot(zp) #plot smaller rpart object