# split.formula: Formula Interface for Split

## Description

Implementation of a simple formula interface for the `split`

function.

## Usage

# S3 method for formula
split (x, f, drop = FALSE, data = NULL, ...)

## Arguments

x

a formula of the form `y ~ x`

.

f

a 'factor' in the sense that `as.factor(f)`

defines the grouping, or a list of such factors in which case their interaction is used for the grouping.

drop

logical indicating if levels that do not occur should be dropped (if `f`

is a `factor`

or a list).
Defaults to FALSE.

data

the data frame from which the formula should
be evaluated.

…

other arguments to be passed to
`split`

.

## Examples

# NOT RUN {
split(extra ~ group, data = sleep)
# }