subjectCenteringTransform is a transformation that can be applied to a matrix of data. the resulting matrix have means that are centered on the grand mean, subject-wise c05superb.
subjectCenteringTransform(dta, variables)a data.frame containing the data in wide format;
a vector of column names on which the transformation will be applied. the remaining columns will be left unchanged
a data.frame of the same form as dta with the variables transformed.