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Data Dictionary: ACS 2010 (3-Year Estimates)
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Data Source: Social Explorer; U.S. Census Bureau
Universe: Foreign-born Population
Variable Details
T131. Year of Entry for the Foreign-Born Population
Universe: Foreign-born Population
T131_001Foreign-Born Population:
Percent base:
None - percentages not computed (variable is table universe)
Aggregation method:
Addition
Formula used to compute this variable:
Return_Value = ACS2010_3yr:B05005004 + ACS2010_3yr:B05005009 + ACS2010_3yr:B05005014 + ACS2010_3yr:B05005019; if (ACS2010_3yr:B05005004.IsNull || ACS2010_3yr:B05005009.IsNull || ACS2010_3yr:B05005014.IsNull || ACS2010_3yr:B05005019.IsNull) Return_Value.IsNull = true
Variables used in the formula:
ACS2010_3yr:B05005004
Population Born Outside the United States: Entered 2000 or Later: Foreign Born
ACS2010_3yr:B05005009
Population Born Outside the United States: Entered 1990 to 1999: Foreign Born
ACS2010_3yr:B05005014
Population Born Outside the United States: Entered 1980 to 1989: Foreign Born
ACS2010_3yr:B05005019
Population Born Outside the United States: Entered Before 1980: Foreign Born
Relevant Documentation:
Excerpt from: Social Explorer; U.S. Census Bureau; American Community Survey 2008-2010 Summary File: Technical Documentation.
  ACS 2010 3-Year Summary File: Technical Documentation -> Appendix A. Supplemental Documentation -> 2010 Subject Definitions -> Population Variables -> Year of Entry
Year of Entry
The data on year of entry were derived from answers to Question 9. This question was asked about Persons 1 through 5 in the ACS, and was restricted to those persons who on Question 8 answered that they were in citizenship categories (2) born in Puerto Rico, Guam, the U.S. Virgin Islands, or Northern Marianas, (3) born abroad of U.S. citizen parent or parents, (4) U.S. citizen by naturalization, or (5) not a U.S citizen.

All respondents born outside the United States were asked for the year in which they came to live in the United States. This includes people born in Puerto Rico and U.S. Island Areas; people born abroad of an U.S. citizen parent or parents; and the foreign born. (See "Citizenship Status.") For the Puerto Rico Community Survey, respondents were asked for the year in which they came to live in Puerto Rico.

The responses to this question indicate when persons born outside of the U.S. came to live in the United States.

Question/Concept History
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Since 1996, the year of entry questions for the American Community Survey and for the Puerto Rico Survey were identical. An instruction was added beginning in 1999 to "Print numbers in boxes."

Limitation of the Data
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Respondents were directed to indicate the year they entered the U.S. "to live." (or "to live" in Puerto Rico, for the Puerto Community Survey). For respondents who entered the U.S. (or entered Puerto Rico for the Puerto Rico Community Survey) multiple times, the interviewers were instructed to request the most recent year of entry. For respondents who entered multiple times and did not ask the interviewer for clarification or who mailed back the questionnaire without being interviewed in person, it is unclear which year of entry was provided (i.e. first or most recent).

Beginning in 2006, the population in group quarters (GQ) is included in the ACS. Some types of GQ populations may have year of entry distributions that are different from the household population. The inclusion of the GQ population could therefore have a noticeable impact on the year of entry distribution. This is particularly true for areas with substantial GQ populations.

Comparability
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Year of entry was comparable across ACS years. A note of caution when comparing ACS and Census 2000 year of entry data: Census 2000 represents data collected as of April 1, 2000 and thus the "2000" year of entry category accounts only for the first quarter (Jan-Mar) in 2000. In comparison, the ACS represents data collected throughout the entire year and thus the "2000" year of entry category accounts for the entire year of 2000.

Excerpt from: Social Explorer; U.S. Census Bureau; American Community Survey 2008-2010 Summary File: Technical Documentation.
  ACS 2010 3-Year Summary File: Technical Documentation -> Appendix A. Supplemental Documentation -> 2010 Subject Definitions -> Population Variables -> Place of Birth -> Foreign Born
Foreign Born
The foreign-born population includes anyone who was not a U.S. citizen at birth. This includes respondents who indicated they were a U.S. citizen by naturalization or not a U.S. citizen. (See also "Citizenship Status.")
The foreign-born population is shown by selected area, country, or region of birth. The places of birth shown in data products were chosen based on the number of respondents who reported that area or country of birth.