Data Dictionary: ACS 2008 (1-Year Estimates)
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Data Source: U.S. Census Bureau
Table: B19313G. Aggregate Income In The Past 12 Months (In 2008 Inflation-Adjusted Dollars) For The Population 15 Years And Over (Two Or More Races) [1]
Universe: Two or more races population 15 years and over
Table Details
B19313G. Aggregate Income In The Past 12 Months (In 2008 Inflation-Adjusted Dollars) For The Population 15 Years And Over (Two Or More Races)
Universe: Two or more races population 15 years and over
Relevant Documentation:
Excerpt from: Social Explorer; U.S. Census Bureau; American Community Survey 2008 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 2008 Summary File: Technical Documentation.
 
Adjusting Income for Inflation
Income components were reported for the 12 months preceding the interview month. Monthly Consumer Price Indices (CPI) factors were used to inflation-adjust these components to a reference calendar year (January through December). For example, a household interviewed in March 2008 reports their income for March 2007 through February 2008. Their income is adjusted to the 2008 reference calendar year by multiplying their reported income by 2008 average annual CPI (January-December 2008) and then dividing by the average CPI for March 2007-February2008.

In order to inflate income amounts from previous years, the dollar values on individual records are inflated to the latest years dollar values by multiplying by a factor equal to the average annual CPI-U-RS factor for the current year, divided by the average annual CPI-U-RS factor for the earlier/earliest year.
Excerpt from: Social Explorer; U.S. Census Bureau; American Community Survey 2008 Summary File: Technical Documentation.
 
Age
The data on age were derived from answers to Question 4. The age classification is based on the age of the person in complete years at the time of interview. Both age and date of birth are used in combination to calculate the most accurate age at the time of the interview. Inconsistently reported and missing values are assigned or imputed based on the values of other variables for that person, from other people in the household, or from people in other households ("hot deck" imputation). Data on age are used to determine the applicability of other questions for a particular individual and to classify other characteristics in tabulations. Age data are needed to interpret most social and economic characteristics used to plan and analyze programs and policies. Therefore, age data are tabulated by many different age groupings, such as 5-year age groups.
Median Age
The median age is the age that divides the population into two equal-size groups. Half of the population is older than the median age and half is younger. Median age is based on a standard distribution of the population by single years of age and is shown to
the nearest tenth of a year. (See the sections on "Standard Distributions" and "Medians" under "Derived Measures.")
Age Dependency Ratio
The age dependency ratio is derived by dividing the combined under-18 and 65-and-over populations by the 18-to-64 population and multiplying by 100.
Old-Age Dependency Ratio
The old-age dependency ratio is derived by dividing the population 65 years and over by the 18-to-64 population and multiplying by 100.
Child Dependency Ratio
The child dependency ratio is derived by dividing the population under 18 years by the 18-to-64 population, and multiplying by 100.
Limitation of the Data
Caution should be taken when comparing population in age groups across time. The entire population continually ages into older age groups over time and babies fill in the youngest age group. Therefore, the population of a certain age is made up of a completely different group of people in 2000 and 2008. Since populations occasionally experience booms/increases and busts/decreases in births, deaths, or migration (for example, the postwar Baby Boom from 1946-1964), one should not necessarily expect that the population in an age group in Census 2000 should be similar in size or proportion to the population in the same age group in the 2008 ACS. For example, Baby Boomers were age 36 to 54 in Census 2000 while they were age 44 to 62 in the 2008 ACS. Therefore, the age group 55 to 59 would show a considerable increase in population when comparing Census 2000 data with the 2008 ACS data. Beginning in 2006, the population in group quarters (GQ) is included in the ACS. Some types of GQ populations have age distributions that are very different from the household population. The inclusion of the GQ population could therefore have a noticeable impact on the age distribution. This is particularly true for areas with a substantial GQ population.
Question/Concept History
The 1996-2002 American Community Survey question asked for month, day, and year of birth before age. Since 2003, the American Community Survey question asked for age, followed by month, day, and year of birth. In 2008, an additional instruction was provided with the age and date of birth question on the American Community Survey questionnaire to report babies as age 0 when the child was less than 1 year old. The addition of this instruction occurred after 2005 National Census Test results indicated increased accuracy of age reporting for babies less than one year old.
Excerpt from: Social Explorer; U.S. Census Bureau; American Community Survey 2008 Summary File: Technical Documentation.
 
Two or More Races
People may have chosen to provide two or more races either by checking two or more race response check boxes, by providing multiple responses, or by some combination of check boxes and write-in responses. The race response categories shown on the questionnaire are collapsed into the five minimum races identified by the OMB, and the Census Bureau's "Some other race" category. For data product purposes, "Two or More Races" refers to combinations of two or more of the following race categories:
1. White
2. Black or African American
3. American Indian and Alaska Native
4. Asian
5. Native Hawaiian and Other Pacific Islander
6. Some other race

There are 57 possible combinations (see below) involving the race categories shown above. Thus, according to this approach, a response of "White" and "Asian" was tallied as two or more races, while a response of "Japanese" and "Chinese" was not because "Japanese" and "Chinese" are both Asian responses.
Excerpt from: Social Explorer; U.S. Census Bureau; American Community Survey 2008 Summary File: Technical Documentation.
 
Two or More Races (57 Possible Specified Combinations)
  1. White; Black or African American
  2. White; American Indian and Alaska Native
  3. White; Asian
  4. White; Native Hawaiian and Other Pacific
  5. Islander
  6. White; Some other race
  7. Black or African American; American Indian and Alaska Native
  8. Black or African American; Asian
  9. Black or African American; Native Hawaiian and Other Pacific Islander
  10. Black or African American; Some other race
  11. American Indian and Alaska Native; Asian
  12. American Indian and Alaska Native; Native Hawaiian and Other Pacific Islander
  13. American Indian and Alaska Native; Some other race
  14. Asian; Native Hawaiian and Other Pacific Islander
  15. Asian; Some other race
  16. Native Hawaiian and Other Pacific Islander; Some other race
  17. White; Black or African American; American Indian and Alaska Native
  18. White; Black or African American; Asian
  19. White; Black or African American; Native Hawaiian and Other Pacific Islander
  20. White; Black or African American; Some other race
  21. White; American Indian and Alaska Native; Asian
  22. White; American Indian and Alaska Native; Native Hawaiian and Other Pacific Islander
  23. White; American Indian and Alaska Native; Some other race
  24. White; Asian; Native Hawaiian and Other Pacific Islander
  25. White; Asian; Some other race
  26. White; Native Hawaiian and Other Pacific Islander; Some other race
  27. Black or African American; American Indian and Alaska Native; Asian
  28. Black or African American; American Indian and Alaska Native; Native Hawaiian and Other Pacific Islander
  29. Black or African American; American Indian and Alaska Native; Some other race
  30. Black or African American; Asian; Native Hawaiian and Other Pacific Islander
  31. Black or African American; Asian; Some other race
  32. Black or African American; Native Hawaiian and Other Pacific Islander; Some other race
  33. American Indian and Alaska Native; Asian; Native Hawaiian and Other Pacific Islander
  34. American Indian and Alaska Native; Asian; Some other race
  35. American Indian and Alaska Native; Native Hawaiian and Other Pacific Islander; Some other race
  36. Asian; Native Hawaiian and Other Pacific Islander; Some other race
  37. White; Black or African American; American Indian and Alaska Native; Asian
  38. White; Black or African American; American Indian and Alaska Native; Native Hawaiian and Other Pacific Islander
  39. White; Black or African American; American Indian and Alaska Native; Some other race
  40. White; Black or African American; Asian; Native Hawaiian and Other Pacific Islander
  41. White; Black or African American; Asian; Some other race
  42. White; Black or African American; Native Hawaiian and Other Pacific Islander; Some other race
  43. White; American Indian and Alaska Native; Asian; Native Hawaiian and Other Pacific Islander
  44. White; American Indian and Alaska Native; Asian; Some other race
  45. White; American Indian and Alaska Native; Native Hawaiian and Other Pacific Islander; Some other race
  46. White; Asian; Native Hawaiian and Other Pacific Islander; Some other race
  47. Black or African American; American Indian and Alaska Native; Asian; Native Hawaiian and Other Pacific Islander
  48. Black or African American; American Indian and Alaska Native; Asian; Some other race
  49. Black or African American; American Indian and Alaska Native; Native Hawaiian and Other Pacific Islander; Some other race
  50. Black or African American; Asian; Native Hawaiian and Other Pacific Islander; Some other race
  51. American Indian and Alaska Native; Asian; Native Hawaiian and Other Pacific Islander; Some other race
  52. White; Black or African American; American Indian and Alaska Native; Asian; Native Hawaiian and Other Pacific Islander
  53. White; Black or African American; American Indian and Alaska Native; Asian; Some other race
  54. White; Black or African American; American Indian and Alaska Native; Native Hawaiian and Other Pacific Islander; Some other race
  55. White; Black or African American; Asian; Native Hawaiian and Other Pacific Islander; Some other race
  56. White; American Indian and Alaska Native; Asian; Native Hawaiian and Other Pacific Islander; Some other race
  57. Black or African American; American Indian and Alaska Native; Asian; Native Hawaiian and Other Pacific Islander; Some other race
  58. White; Black or African American; American Indian and Alaska Native; Asian; Native Hawaiian and Other Pacific Islander; Some other race
Given the many possible ways of displaying data on two or more races, data products will provide varying levels of detail. The most common presentation shows a single line indicating "Two or more races." Some data products provide totals of all 57 possible race combinations, as well as subtotals of people reporting a specific number of races, such as people reporting two races, people reporting three races, and so on. In other presentations on race, data are shown for the total number of people who reported one of the six categories alone or in combination with one or more other race categories. For example, the category, "Asian alone or in combination with one or more other races" includes people who reported Asian alone and people who reported Asian in combination with White, Black or African American, Native Hawaiian and Other Pacific Islander, and/or Some other race. This number, therefore, represents the maximum number of people who reported as Asian in the question on race. When this data presentation is used, the individual race categories will add to more than the total population because people may be included in more than one category.