1 / 30

Understanding Census Geography

Join Lisa Neidert in this informative NPC Workshop, where you'll learn to analyze poverty and socioeconomic trends using the American Community Survey (ACS). Gain insights into census geography, including geographic areas with one-year and three-year data. Discover available resources such as reference maps and lookup tables. Understand how to utilize Public Use Microdata Areas (PUMAs) for more in-depth analysis and explore the complexities of census tracts and zip code data. Enhance your research skills using ACS data effectively.

dayo
Télécharger la présentation

Understanding Census Geography

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Understanding Census Geography Lisa Neidert NPC Workshop: Analyzing Poverty and Socioeconomic Trends Using the American Community Survey July 12 – July 15, 2010

  2. Census Geography

  3. Geographic Areas:with 1-year and 3-year data

  4. Geographic Areas:with 1-year and 3-year data

  5. What’s available in the ACS for single year data: via maps • Maps showing counties and places for each state (or the nation) • http://www.census.gov/acs/www/Products/users_guide/acs_2008_reference_maps.htm

  6. Counties with single year data: ACS 2008

  7. Almost all counties:DE, MA

  8. Few counties, no places:VT and WY

  9. State with American Indian Places: AK, AL, LA, NC, OK

  10. Counties with 3-year data:ACS 2006-2008

  11. States where all counties are over 20,000 • Connecticut • Delaware • District of Columbia • New Hampshire • New Jersey • Rhode Island

  12. What geographies are available in the 2006-2006 ACS http://www.census.gov/acs/www/acs-php/2006_2008_beginner_users_guide.php

  13. Geographical Areas (Texas):Covered in 2006-2008 • ACS 2006=2008 Geographical Areas

  14. What’s available in the ACS: via Look-up tables • Geographic entities available for 1-year data (2008) • Geographic entities available for 3-year data (2006-2008)

  15. Not ready for prime-time:census tracts and zip codes • Need 5-year estimates file • 2005 – 2009 • Available 2010 for Census Tracts; • 2011 for Zip Codes • Annual updates thereafter • 2006 – 2010 • 2007 – 2011, etc. • Possible delay for 5-year data • – only an unsubstantiated rumor

  16. ExampleCensus Tracts for community districts

  17. Zip codes • Not census geography • However, big demand for zip code data • Census Bureau builds ZCTAs via census blocks • ZCTA FAQs • http://www.census.gov/geo/ZCTA/zctafaq.html • Fun resource • http://en.wikipedia.org/wiki/Zip_code

  18. What to do with a 2011 release of zip code data? • See Exercise 4: • http://www.psc.isr.umich.edu/dis/workshop/npc2010/Exercise4_DealingWithDelays.pdf • This exercise shows how to build zip code characteristics from census tract characteristics

  19. What are PUMAs? • Public Use Microdata areas • Combination of population geographies that sum to at least 100,000 population. • In rural areas, several counties will form a PUMA. In an urban area, a county will be subdivided into multiple PUMAs. • PUMAs do not cross state boundaries

  20. PUMAs. . . . • PUMAs do not have good comparability over time (1990, 2000). • PUMA geographies for the ACS are the same as the 2000 boundaries • PUMAs are reasonable substitutes for counties • Smallest geography available in the microdata.

  21. PUMAs • Can be valuable for bypassing geographic restrictions when one wants national information at the county level • Create pseudo counties based on a cross-walk between PUMAs and counties

  22. Statistics based on 1-year ACS data Unit is county

  23. Statistics based on 3-year ACS dataUnit is county

  24. Statistics based on 1-year ACS dataUnit is PUMA

  25. Illinois example:PUMA to county example

  26. PUMA to County Widget • Based on PDQ-Explore output • http://www.psc.isr.umich.edu/dis/data/resource/detail/1527 • Based on American FactFinder output • http://www.psc.isr.umich.edu/dis/data/resource/detail/1528 • Try one this week

  27. Class Exercises Today • http://mblog.lib.umich.edu/NPC2010/archives/class_exercises/index.html • Poverty Hot-spots (ACS 2008) • Census tract data (Census 2000) • Bulk downloads, zip code (Census 2000) • Dealing with Delays: Creating zip code characteristics from census tract data

  28. PUMAs via Maps • Reasonable tool for rural parts of a state • Somewhat unwieldy for urban areas • Multiple maps per state http://usa.ipums.org/usa/volii/2000pumas.shtml

  29. PUMAs via text • Describes PUMA composition • By: • County • County subdivision • Place • Census tract • http://usa.ipums.org/usa/volii/2000pumas.shtml • http://www.psc.isr.umich.edu/dis/data/ref/PUMA/SUPERPUMA-2000-5pct.html

  30. Metropolitan areas • Defined by Office Management Budget (OMB) • http://www.census.gov/population/www/estimates/metrodef.html • Historical Definitions • http://www.census.gov/population/www/estimates/pastmetro.html • Researcher is free to follow own definitions • Census Bureau follows OMB definitions

More Related