it normalizes each subject (identified by idvar) so that they have the same mean, within each group specified by betweenvars. data: a data frame. idvar: the name of a column that identifies each subject (or matched subjects) measurevar: the name of a column that contains the variable to be summariezed betweenvars: a vector containing names of columns that are between-subjects variables na.rm: a boolean that indicates whether to ignore NA's
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