categorical_sample_size
                        Estimate the sample size for a variable in
                        function of its categories.
information_gain        Estimating information gain between two
                        categorical variables.
joint_shannon_entropy   Estimation of the Joint Shannon entropy for two
                        categorical variables.
msu                     Estimating Multivariate Symmetrical
                        Uncertainty.
multivar_joint_shannon_entropy
                        Estimation of joint Shannon entropy for a set
                        of categorical variables.
new_informative_variable
                        Create an informative uniform categorical
                        random variable.
new_variable            Create a uniform categorical random variable.
new_xor_variables       Create a set of categorical variables using the
                        logical XOR operator.
rel_freq                Relative frequency of values of a categorical
                        variable.
sample_size             Estimate the sample size for a categorical
                        variable.
shannon_entropy         Estimation of Shannon entropy for a categorical
                        variable.
symmetrical_uncertainty
                        Estimating Symmetrical Uncertainty of two
                        categorical variables.
total_correlation       Estimation of total correlation for a set of
                        categorical random variables.
