bruceR: group_mean_center – R documentation

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group_mean_center

Group-mean centering

Compute group-mean centered variables. Usually used for HLM level-1 predictors.

group_mean_center(
  data,
  vars,
  by,
  std = FALSE,
  add_suffix = "",
  add_group_mean = "_mean"
)

`data`	Data object.
`vars`	Variable(s) to be centered.
`by`	Grouping variable.
`std`	Standardized or not. Default is `FALSE`.
`add_suffix`	The suffix of the centered variable(s). Default is `""`. You may set it to `"_c"`, `"_center"`, etc.
`add_group_mean`	The suffix of the variable name(s) of group means. Default is `"_mean"` (see Examples).

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

d=data.table(x=1:9, g=rep(1:3, each=3))

d.c=group_mean_center(d, "x", by="g")
d.c

d.c=group_mean_center(d, "x", by="g", add_suffix="_c")
d.c

Broadly Useful Convenient and Efficient R Functions

v0.6.2

GPL-3

Authors

Han-Wu-Shuang Bao [aut, cre]

Initial release

2021-04-08