Center Variables (Mean-Centering)

Centers numeric variables by subtracting the mean. Supports group-wise centering for multilevel/nested data. Works with dplyr mutate/across.

Usage

center(data, Vars, suffix = "_c", group_by = NULL)

Arguments

data

A data frame (or vector if used in mutate).

Vars

Character vector of numeric variable names to center. Not needed if used in mutate.

suffix

Character. Suffix for new column names. Default "_c".

group_by

Character. Name of grouping variable for group-wise centering. Optional.

Value

Data frame with centered variables added, or vector if input is vector.

Examples

if (FALSE) { # \dontrun{
# Simple mean centering
df <- center(mtcars, Vars = c("mpg", "hp"))

# Group-mean centering
df <- center(mtcars, Vars = "mpg", group_by = "cyl")

# With dplyr
library(dplyr)
mtcars %>% mutate(mpg_c = center_vec(mpg))
mtcars %>% mutate(across(c(mpg, hp), center_vec, .names = "{.col}_c"))

# Group-wise with dplyr
mtcars %>% group_by(cyl) %>% mutate(mpg_c = center_vec(mpg))
} # }