| adjacency | Compute the Adjacency Matrix for a vector of preferences |
| as_preferences | Preferences Objects |
| format.preferences | Preferences Objects |
| levels.preferences | Preferences Objects |
| long_preferences | Preferences Objects |
| preferences | Preferences Objects |
| 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 |
| ranking_matrix | Compute the Rankings Matrix for a vector of preferences |
| read_preflib | Read Ordinal Preference Data From PrefLib |
| wide_preferences | Preferences Objects |
| write_preflib | Write Ordinal Preference Data to PrefLib Formats |