Fhat_conditional_       Weighted empirical cumulative distribution
                        function (ecdf), conditional on one or more
                        variables
Fhat_df_                Weighted empirical cumulative distribution
                        function (data frame version)
combn_char              Generate all combinations of the elements of a
                        character vector
dcc                     Data cube creation (dcc)
dcc6                    Data cube creation
distrr                  Estimate and manage empirical distributions
extract_unique          Functions to be used in conjunction with 'dcc'
                        family
invented_wages          Invented dataset with wages of men and women.
jointfun_               A minimal function which counts the number of
                        observations by groups in a data frame
only_joint              Keeps only joint distribution (removes
                        '.total').
wq                      Empirical weighted quantile
