age_calculate           Calculate age between two dates
age_from_chi            Extract age from the CHI number
area_lookup             Codes and names of Scottish geographical and
                        administrative areas.
as_percent              Percentages
chi_check               Check the validity of a CHI number
chi_pad                 Add a leading zero to nine-digit CHI numbers
create_age_groups       Create age groups
dob_from_chi            Extract Date of Birth (DoB) from the CHI number
extract_fin_year        Extract the formatted financial year from a
                        date
format_postcode         Format a postcode
match_area              Translate geography codes into area names
qtr                     Assign a date to a quarter
sex_from_chi            Extract sex from the CHI number
