Parameter Tree:
EARTH SCIENCE > HUMAN DIMENSIONS > SOCIOECONOMICS > HOUSEHOLD INCOME

Definition:
A measure commonly used by the United States government and private institutions. Each household is measured by the income of every resident over the age of 18. Income includes wages and salaries, unemployment insurance, disability payments, child support payments received(child support given does not deduct income measured), regular rental receipts, as well as any personal business, investment, or other kinds of income received routinely

Reference:
United States Department of Housing and Urban Development