|Data Dictionary:||ACS 2006 -- 2008 (3-Year Estimates)|
|Data Source:||U.S. Census Bureau|
Universe: Universe: Households
|ACS 2008-3yr Summary File: Technical Documentation -> Appendix B: Subject Definitions -> Derived Measures -> Aggregate|
An aggregate is the sum of the values for each of the elements in the universe. For example, aggregate household income is the sum of the incomes of all households in a given geographic area. Means are derived by dividing the aggregate by the appropriate universe. When an aggregate used as a numerator is rounded in the detailed (base) tables, the rounded value is used for the calculation of the mean.
|ACS 2008-3yr Summary File: Technical Documentation -> Appendix B: Subject Definitions -> Population Variables -> Income in the Past 12 Months -> Shares of Household Income by Quintiles|
Negative incomes are converted to zero for these measures. These measures are the aggregate household income in each quintile as a percentage of the total aggregate household income. (For more information on aggregates, see "Aggregate income." For more information on quintiles, see "Derived Measures.")