average hourly earnings
years of formal education
years of potential work experience
= 1 if female
= 1 if male
= 1 if in durable manufacturing
= 1 if in construction
= 1 if in nondurable manufacturing
= 1 if in transportation/communcations/utilities
= 1 if in wholesale or retail trade
= 1 if in personal or business services
= 1 if in professional services