by_scale: Group-wise scaling of data

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

Group-wise scaling of data

Description

Splits a data frame or matrix by grouping variables and scales numeric variables within each group.

Usage

scaleBy(formula, data = parent.frame(), center = TRUE, scale = TRUE)

scale_by(data, formula, center = TRUE, scale = TRUE)

Arguments

formula	Grouping structure: a formula, character vector, or variables as as.quoted.
data	A data frame or matrix.
center	Logical; if TRUE, center the variables.
scale	Logical; if TRUE, scale the variables.

Value

A list of data frames or matrices (same class as input), one per group.

Author(s)

Søren Højsgaard, [e-mail]

See Also

summaryBy, transformBy, orderBy

Examples

scale_by(iris, ~Species)
scale_by(iris, ~1)

## Combine result into one data frame:
a <- scale_by(iris, ~Species)
d <- do.call(rbind, a)

## Old interface
scaleBy(~Species, data = iris, center = TRUE, scale = FALSE)
scaleBy(~1, data = iris)

doBy documentation built on June 30, 2025, 1:06 a.m.