Annual earnings in $
Natural logarighm of earnings
= 1 if earnings > 80000 and = 0 otherwise
Age in years
Natural logarithm of age
Age squared
= 1 if age >= 50 and = 0 otherwise
Educational attainment: years of schooling
Education squared
= 1 if female and = 0 if male
Education times Age
Usual hours worked per week
Natural logarithm of hours
State name
State (FIPS code)
State unemplyment rate in 2010
State income per capita in 2010