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Compute grand-mean centered variables. Usually used for GLM interaction-term predictors and HLM level-2 predictors.
grand_mean_center(data, vars = names(data), std = FALSE, add.suffix = "")
A new data object containing the centered variable(s).
Data object.
Variable(s) to be centered.
Standardized or not. Defaults to FALSE.
FALSE
The suffix of the centered variable(s). Defaults to "". You may set it to "_c", "_center", etc.
""
"_c"
"_center"
group_mean_center
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
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