Display a pretty frequency table. It is only a wrapper to the function
but with a richer output, at least for numerical variables.
a numeric vector.
The output gives the different kinds of frequencies and cumulated frequencies: single frequencies, cumulated and back cumulated (absolute and relatives).
return a matrix with 7 columns: the modaldistinct values of
x, frequencies, relative frequencies, cumulated frequencies,
cumulated relative frequencies, back cumulated frequencies
and back cumulated relative frequencies.
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