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Data Dictionary: ACS 2009 (3-Year Estimates)
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Data Source: Social Explorer; U.S. Census Bureau
Universe: Families
Variable Details
T59. Average Family Income (In 2009 Inflation Adjusted Dollars)
Universe: Families
T059_001Average Family Income (In 2009 Inflation adjusted dollars)
Percent base:
None - percentages not computed
Aggregation method:
Division of Sums: variables: Sum(T067_001) / Sum(T110_001)
Formula used to compute this variable:
if( ACS09_3yr:B19101001 == 0) Return_Value.IsNull = true; else Return_Value = ACS09_3yr:B19127001 / ACS09_3yr:B19101001; if (ACS09_3yr:B19101001.IsNull) Return_Value.IsNull = true; if (ACS09_3yr:B19127001.IsNull || ACS09_3yr:B19101001.IsNull) Return_Value.IsNull = true;
Variables used in the formula:
Families: Aggregate family income in the past 12 months (in 2009 inflation-adjusted dollars)
Relevant Documentation:
Question/Concept History
The ACS began asking questions about health insurance coverage in 2008. Because 2008 was the first year of collection, the Census Bureau limited the number and type of data products to simple age breakdowns of overall, private, and public coverage status. The evaluation of the 2008 data suggested that the data were of good quality, so the Census Bureau expanded the data products to include estimates of the specific types of coverage along with estimates about social, economic, and demographic details for people with and without health insurance.

For the 2008 data released September 2009, there was no eligibility edit applied. The eligibility edit that was developed for the 2009 was applied to the 2008 data during spring 2010. New estimates of health insurance coverage with this data are available at

Excerpt from: Social Explorer; U.S. Census Bureau; American Community Survey 2007-2009 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.