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Census 2010: Data, Measurement and Access (over time, space, and surveys)

Census 2010: Data, Measurement and Access (over time, space, and surveys). Thursday, July 28, 2011 10-11:30am. Issues in using multiple sources. “If you want to measure change, don’t change the measure”. - Duncan

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Census 2010: Data, Measurement and Access (over time, space, and surveys)

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  1. Census 2010: Data, Measurement and Access (over time, space, and surveys) Thursday, July 28, 2011 10-11:30am

  2. Issues in using multiple sources “If you want to measure change, don’t change the measure”. -Duncan “You can never step into the same river; for new waters are always flowing on to you.” -Heraclitus “To use the data …. you’ve got to be able to find it. - Vogt

  3. If you want to measure change, don’t change the measure • Statistics vs. data • Differences and identities • When are things the same or different? • And when do we want them to be? • Who gets asked? What gets asked? How are they asked? How are the responses reflected in what you get?

  4. If you want to measure change, don’t change the measure • ACS vs. ACS • ACS vs. Decennial Censuses • Decennial vs. Decennial • Other Surveys • Aggregate vs. Microdata

  5. If you want to measure change, don’t change the measure • ACS vs. ACS

  6. Who gets asked? ACS vs. ACS Biggest issue for ACS Users is if you want to go back prior to 2006. 2005 was the first full implementation of the household sample. 2006 was the first year in which the group quarters sample was added.

  7. What gets asked? http://www.census.gov/acs/www/methodology/questionnaire_archive/

  8. What gets asked? http://www.census.gov/acs/www/methodology/questionnaire_changes/ Most content changes in 2008, 2009

  9. What gets asked? • 2008 • New questions on marital history, health insurance coverage, and veterans service-connected disability status • Complete revision of the disability questions • Modifications to the school enrollment and educational attainment questions to collect more detailed information on grade enrolled and level of attainment. • Modifications to the relationship, year of naturalization, employment, and Food Stamps questions • 2009 • Addition of a question on bachelor’s degree field • 2013 • Parental Place of Birth, Household Computer & Internet Use • Revisions to questions on veterans status and period of service, • Food Stamps, wage and salary income, interest and dividend • income, and cash public assistance

  10. How are they asked ACS vs. ACS Multi-mode, generally comparable, similar NRFU

  11. How are responses reflected in what you get? ACS vs. ACS Aggregate data will differ by geography (1 year/3 year/5 year products) In general – don’t mix and match if doing comparisons. Choose shortest time frame consonant with desired geography and MOE. Avoid comparing overlapping time frames (e.g. 2005-2007 vs 2006-2009). Geographies defined as of Jan 1 of final year in release. For both aggregate and microdata, geographies will shift at decennial.

  12. A Compass for Understanding and Using the ACS… … for General Public, PUMS Users, Congress, Media, Business Community, Federal Agencies, State and Local Governments, Teachers, Researchers, User of American Indian Data, Users of Rural Data……

  13. ACS vs. Census: Who gets asked

  14. ACS vs. Census: Who gets asked The number of households from which the bureau received information from “proxies”—neighbors, building managers, or others—rather than direct information, increased from 17% in 2000 to 22% in 2010.

  15. ACS vs. Census: How are they asked? Impact: In general, greater item response rates in ACS. Item allocation rates vary from more than 20% for property insurance cost, 20% for some or all income items, 17% for real estate taxes, 16% for year of naturalization, 10% for property value, 9% for year of entry, 6% for occupation, 4% language, 1% age, 0.2% sex. Allocation rates for ACS are substantially lower (about half) than for the 2000 Census.

  16. ACS vs. Census: Reference periods Income understated on ACS relative to Decennial 2000. School Enrollment reference period could stretch from 6 wks to 7 months for decennial.

  17. ACS vs. Census: How are responses reflected in what you get?

  18. ACS vs. Census Specific Content comparability vs 2000 Census by topic area http://www.census.gov/acs/www/guidance_for_data_users/comparing_2009/

  19. Similar kinds of comparability guidance from decennial technical documentation

  20. Decennial vs Decennial: What gets released? Summary Files products 1960 and earlier: Mary Ellen Bogue files (Tracts – 1940,1950,1960), county/state/national data NHGIS, Social Explorer (Tract), UV Fisher (county) “one-offs” http://www.census.gov/population/www/censusdata/hiscendata.html

  21. Decennial vs Decennial: What gets released? Summary Files products Historical Statistics of the United States (Millenial Edition)

  22. Decennial vs Decennial: What gets released? Summary Files products Print Volumes

  23. Decennial vs Decennial: What gets released? Summary Files products Generally separate products for: 100% vs sample data detailed age and race widely used socio-demographic iterated race/ethnicity/ancestry “special” tabulations (school districts, EEO, transportation) Also, geographic detail files; MATILDA, MEDList (1970), MARF (1980), MABLE/GEOCORR (1990, 2000).

  24. Other Surveys: Current Population Survey (March)

  25. Questions/Comments email me at: jons@berkeley.edu http://ucdata.berkeley.edu

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