by-split: Split a data frame

In doBy: Groupwise Statistics, LSmeans, Linear Estimates, Utilities

Split a data frame

Description

Split a dataframe according to the levels of variables in the dataframe. The variables to split by can be given as a formula or as a character vector.

Usage

split_by(data, ..., omit = TRUE)

splitBy(formula, data, omit = TRUE)

## S3 method for class 'splitByData'
head(x, n = 6L, ...)

## S3 method for class 'splitByData'
tail(x, n = 6L, ...)

split_by.legacy(data, formula, drop = TRUE)

splitBy.legacy(formula, data = parent.frame(), drop = TRUE)

Arguments

data	A data frame
...	A character vector or, right hand sided formula or a listing of variables.
omit	Logical Should variables split on be omitted from the output. Defaults to TRUE.
formula	A character vector or a right hand sided formula.
x	An object.
n	A single integer. If positive or zero, size for the resulting object: number of elements for a vector (including lists), rows for a matrix or data frame or lines for a function. If negative, all but the "n" last/first number of elements of "x".
drop	Obsolete

Value

A list of dataframes.

Author(s)

Søren Højsgaard, [e-mail]

See Also

orderBy, order_by, summaryBy, summary_by, transformBy, transform_by

Examples

split_by(CO2, ~Treatment+Type)
split_by(CO2, Treatment, Type)
split_by(CO2, c("Treatment", "Type"))
split_by(CO2, Treatment)
x <- CO2 |> split_by(~Treatment)
head(x, 3)
tail(x, 3)

x <- CO2 |> split_by(~Treatment, omit=FALSE)
head(x, 3)
tail(x, 3)

## The "Old" interface
splitBy(~Treatment+Type, CO2)
splitBy(~Treatment+Type, data=CO2)
splitBy(c("Treatment", "Type"), data=CO2)

doBy documentation built on April 11, 2025, 6:13 p.m.