| constant.data.frame | Identify Constant Features of a Data Frame |
| dup.data.frame | Show records with duplicate or duplicated values of grouping variables. |
| dupGroups.data.frame | Index records with with duplicate or duplicated values of grouping variables. |
| enumerate | Count unique combinations of items in specified columns. |
| ignore | Drop columns in x that are present in y. |
| informative | Drop columns in x that are entirely NA. |
| informative.data.frame | Drop columns in x that are entirely NA. |
| itemize | Show unique combinations of items in specified columns |
| misplaced.data.frame | Index records whose relative positions would change if sorted. |
| na.data.frame | Show records with NA values of grouping variables. |
| naGroups.data.frame | Index records with NA values of grouping variables. |
| safe_join.data.frame | Join Data Frames Safely |
| sort.grouped_df | Arrange by groups. |
| static | Find unique records for subset of columns with one unique value. |
| status.data.frame | Report status with respect to grouping variables. |
| unsorted.data.frame | Extract records whose relative positions would change if sorted. |
| weak.data.frame | Show records with NA, duplicate or duplicated values of grouping variables. |