person id, white males age 14-22 in 1979
linear trend, t=1 in 1979 to t=15 in 1993
years interviewed, 0=1979 to 14=1993
education completed by 1993
potential experience = age - education - 5
ability = index based on 10 tests given in 1980
mother's education
father's education
= 1 if in a broken home at age 14, 0 otherwise
number of siblings
wage (1993 dollars)