biasCorrectionTransform is a transformation that can
be applied to a matrix of data. The resulting matrix's variance
is corrected for bias (Morey 2008)
biasCorrectionTransform(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.
This function is useful when passed to the argument preprocessfct of superbPlot()
where it performs a modification of the data matrix.
Morey RD (2008). “Confidence Intervals from Normalized Data: A correction to Cousineau (2005).” Tutorials in Quantitative Methods for Psychology, 4, 61 -- 64. doi:10.20982/tqmp.04.2.p061 .