meanvar.rpart {rpart} | R Documentation

## Mean-Variance Plot for an Rpart Object

### Description

Creates a plot on the current graphics device of the deviance of the node divided by the number of observations at the node. Also returns the node number.

### Usage

    meanvar(tree, ...)

    ## S3 method for class 'rpart':
    meanvar(tree, xlab="ave(y)", ylab="ave(deviance)", ...)

### Arguments

`tree` | fitted model object of class `rpart`. This is asumed to be the result of some function that produces an object with the same named components as that returned by the `rpart` function.
`xlab` | x-axis label for the plot.
`ylab` | y-axis label for the plot.
`...` | additional graphical parameters may be supplied as arguments to this function.

### Value

an invisible list containing the following vectors is returned.

`x` | fitted value at terminal nodes (`yval`).
`y` | deviance of node divided by number of observations at node.
`label` | node number.

### Side Effects

a plot is put on the current graphics device.

### See Also

`plot.rpart`.

### Examples

    data(car.test.frame)
    z.auto <- rpart(Mileage ~ Weight, car.test.frame)
    meanvar(z.auto, log='xy')

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