| academic_year | Academic year | 
| clean_multiple_underscores | clean multiple underscores | 
| destring | Convert character vector to numeric, ignoring irrelevant characters. | 
| group_summary | Group Summary | 
| group_summary_rank | Group Summary Rank | 
| interval_round | Interval round | 
| ltrim | LTrim | 
| median_top_10 | Median top 10 percentage | 
| mode | Mode (most common value) | 
| month_name | Month Name | 
| rtrim | RTrim | 
| str_replace_all_in_file | Replace all occurences of a pattern in a file | 
| sum_0_1 | Sum 0 1 | 
| test_01 | Test 01 | 
| test_yes_no | Test Yes/No Responses | 
| transform_01_to_ft | Transform 01 to FT | 
| transform_logical_yes_no | Transform Logical to Yes/No and Vice Versa | 
| translate_yes_no | Translate Yes/No Responses | 
| trim | Trim |