grand_mean_center: Grand-mean centering.

In bruceR: Broadly Useful Convenient and Efficient R Functions

Grand-mean centering.

Description

Compute grand-mean centered variables. Usually used for GLM interaction-term predictors and HLM level-2 predictors.

Usage

grand_mean_center(data, vars = names(data), std = FALSE, add.suffix = "")

Arguments

data	Data object.
vars	Variable(s) to be centered.
std	Standardized or not. Defaults to FALSE.
add.suffix	The suffix of the centered variable(s). Defaults to "". You may set it to "_c", "_center", etc.

Value

A new data object containing the centered variable(s).

See Also

group_mean_center()

Examples

d = data.table(a=1:5, b=6:10)

d.c = grand_mean_center(d, "a")
d.c

d.c = grand_mean_center(d, c("a", "b"), add.suffix="_center")
d.c

bruceR documentation built on Aug. 21, 2025, 5:38 p.m.