text.rpart {rpart} | R Documentation

## Place Text on a Dendrogram

### Description

Labels the current plot of the tree dendrogram with text.

### Usage

    ## S3 method for class 'rpart':
    text(x, splits=TRUE, label="yval", FUN=text, all=FALSE,
         pretty=NULL, digits=getOption("digits") - 3, use.n=FALSE,
         fancy=FALSE, fwidth=0.8, fheight=0.8, ...)

### Arguments

`x` | 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.
`splits` | logical flag. If `TRUE` (default), then the splits in the tree are labeled with the criterion for the split.
`label` | a column name of `x$frame`; values of this will label the nodes. For the `"class"` method, `label="yval"` results in the factor levels being used, `"yprob"` results in the probability of the winning factor level being used, and ‘specific yval level’ results in the probability of that factor level.
`FUN` | the name of a labeling function, e.g. `text`.
`all` | Logical. If `TRUE`, all nodes are labeled, otherwise just terminal nodes.
`pretty` | an integer denoting the extent to which factor levels in split labels will be abbreviated. A value of (0) signifies no abbreviation. A `NULL`, the default, signifies using elements of letters to represent the different factor levels.
`digits` | number of significant digits to include in numerical labels.
`use.n` | Logical. If `TRUE` (default), adds to label (#events level1/ #events level2/etc. for `class`, `n` for `anova`, and #events/n for `poisson` and `exp`).
`fancy` | Logical. If `TRUE`, nodes are represented by ellipses (interior nodes) and rectangles (leaves) and labeled by `yval`. The edges connecting the nodes are labeled by left and right splits.
`fwidth` | Relates to option `fancy` and the width of the ellipses and rectangles. If `fwidth < 1` then it is a scaling factor (default = 0.8). If `fwidth > 1` then it representes the number of character widths (for current graphical device) to use.
`fheight` | Relates to option `fancy` and the height of the ellipses and rectangles. If `fheight <1` then it is a scaling factor (default = 0.8). If `fheight > 1` then it represents the number of character heights (for current graphical device) to use.
`...` | Graphical parameters may also be supplied as arguments to this function (see `par`).

### Side Effects

the current plot of a tree dendrogram is labeled.

### See Also

`text`, `plot.rpart`, `rpart`, `post.rpart`, `abbreviate`

### Examples

    data(freeny)
    freen.tr <- rpart(y ~ ., freeny)
    plot(freen.tr)
    text(freen.tr, use.n=TRUE, all=TRUE)

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