CPS78_85.DES educ south nonwhite female married exper expersq union lwage age year y85 y85fem y85educ y85union Obs: 1084 1. educ years of schooling 2. south =1 if live in south 3. nonwhite =1 if nonwhite 4. female =1 if female 5. married =1 if married 6. exper age - educ - 6 7. expersq exper^2 8. union =1 if belong to union 9. lwage log hourly wage 10. age in years 11. year 78 or 85 12. y85 =1 if year == 85 13. y85fem y85*female 14. y85educ y85*educ 15. y85union y85*union