This function is called at each iteration of the constant data removal process until no constant data remains.
perform_remove_constants(data, cutoff)
A <list>
with the input dataset where all empty rows and
columns as well as constant columns have been removed.
The input <data.frame>
or <linelist>
A <numeric>
value specifying the cut-off for removing
empty rows and columns. If provided, only rows and columns with a
percentage of missing data greater than this cut-off will be removed.
The default is 1.