Data Dictionary: ACS 2005 -- 2009 (5-Year Estimates)
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Data Source: U.S. Census Bureau
Table: B19129. Aggregate Family Income In The Past 12 Months (In 2009 Inflation-Adjusted Dollars) By Number Of Workers In Family [7]
Universe: Families
Table Details
B19129. Aggregate Family Income In The Past 12 Months (In 2009 Inflation-Adjusted Dollars) By Number Of Workers In Family
Universe: Families
Relevant Documentation:
Excerpt from: Social Explorer; U.S. Census Bureau; American Community Survey 2005-2009 Summary File: Technical Documentation.
 
Aggregate Income
Aggregate income is the sum of all incomes for a particular universe. Aggregate income is subject to rounding, which means that all cells in a matrix are rounded to the nearest hundred dollars. (For more information, see "Aggregate" under "Derived Measures".)

Excerpt from: Social Explorer; U.S. Census Bureau; American Community Survey 2005-2009 Summary File: Technical Documentation.
 
Income of Families
In compiling statistics on family income, the incomes of all members 15 years old and over related to the householder are summed and treated as a single amount. Although the family income statistics cover the past 12 months, the characteristics of individuals and the composition of families refer to the time of interview. Thus, the income of the family does not include amounts received by individuals who were members of the family during all or part of the past 12 months if these individuals no longer resided with the family at the time of interview. Similarly, income amounts reported by individuals who did not reside with the family during the past 12 months but who were members of the family at the time of interview are included. However, the composition of most families was the same during the past 12 months as at the time of interview.