| add_to_dictionary | Add an element to the data dictionary |
| add_to_report | Add an element to the report object |
| check_date_sequence | Checks whether the order in a sequence of date events is chronological. order. |
| check_subject_ids | Check whether the subject IDs comply with the expected format. When incorrect IDs are found, the function sends a warning and the user can call the 'correct_subject_ids' function to correct them. |
| clean_data | Clean and standardize data |
| clean_using_dictionary | Perform dictionary-based cleaning |
| common_na_strings | Common strings representing missing values |
| convert_numeric_to_date | Convert numeric to date |
| convert_to_numeric | Convert columns into numeric |
| correct_subject_ids | Correct the wrong subject IDs based on the user-provided values. |
| find_duplicates | Identify and return duplicated rows in a data frame or linelist. |
| get_default_params | Set and return 'clean_data' default parameters |
| print_report | Generate report from data cleaning operations |
| remove_constants | Remove constant data, including empty rows, empty columns, and columns with constant values. |
| remove_duplicates | Remove duplicates |
| replace_missing_values | Replace missing values with 'NA' |
| scan_data | Scan through a data frame and return the proportion of 'missing', 'numeric', 'Date', 'character', 'logical' values. |
| standardize_column_names | Standardize column names of a data frame or line list |
| standardize_dates | Standardize date variables |
| timespan | Calculate time span between dates |