pooled standard deviation transform

poolSDTransform is a transformations that can be applied to a matrix of data. The resulting matrix has the column- standard deviations equal to the pool standard deviations of the individual columns, the solution adopted by lm94superb.

poolSDTransform(dta, variables)

Arguments

dta

a data.frame containing the data in wide format;

variables

a vector of column names on which the transformation will be applied. the remaining columns will be left unchanged

Value

a data.frame of the same form as dta with the variables transformed.

This function is useful when passed to the argument preprocessfct of superb() where it performs a modification of the data matrix.

References