adjacency               Compute the Adjacency Matrix for a vector of
                        preferences
pref_add_unranked       Complete preferences by adding unselected items
                        as last place occurrances.
pref_blank              Check if a preference is blank.
pref_cov                Covariance matrix for preferences, calculated
                        using the rankings matrix.
pref_get_items          Get the name of the item(s) assigned a specific
                        rank, e.g., first.
pref_get_rank           Get the rank assigned to a specific item in a
                        set of preferences.
pref_irv                Compute the instant-runoff voting winner for a
                        set of preferences.
pref_keep               Keep only specified items from preferences.
pref_length             Check the length (number of rankings) of a
                        preference.
pref_omit               Remove specified items from preferences.
pref_pop                Eliminate lowest (or highest) ranked items from
                        preferences.
pref_rev                Reverse preference rankings
pref_trunc              Truncate preferences to a maximum number of
                        ranks.
pref_type               pref_type
preferences             Preferences Objects
ranking_matrix          Compute the Rankings Matrix for a vector of
                        preferences
read_preflib            Read Ordinal Preference Data From PrefLib
write_preflib           Write Ordinal Preference Data to PrefLib
                        Formats
