UH_OCC_A3 is a 4-digit numeric variable.
Codes available here.
Occupation of job last week - 1968-1970
These string values in the original data have been recoded as follows:
--- => -999 : Missing
- Those working or with a job or looking and have worked full time previously or NILF, but have been in the labor force w/in the last 5 yrs and in rotation 1 or 5.
|1968 – 1970||-||-||X||-||-||-||-||-||-||-||-||-|