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Understanding Census Geography. Lisa Neidert NPC Workshop : Analyzing Poverty and Socioeconomic Trends Using the American Community Survey July 12 – July 15, 2010. Census Geography. Geographic Areas: with 1-year and 3-year data. Geographic Areas: with 1-year and 3-year data.

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understanding census geography

Understanding Census Geography

Lisa Neidert

NPC Workshop: Analyzing Poverty and Socioeconomic Trends Using the American Community Survey

July 12 – July 15, 2010

what s available in the acs for single year data via maps
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
states where all counties are over 20 000
States where all counties are over 20,000
  • Connecticut
  • Delaware
  • District of Columbia
  • New Hampshire
  • New Jersey
  • Rhode Island
what geographies are available in the 2006 2006 acs
What geographies are available in the 2006-2006 ACS

http://www.census.gov/acs/www/acs-php/2006_2008_beginner_users_guide.php

geographical areas texas covered in 2006 2008
Geographical Areas (Texas):Covered in 2006-2008
  • ACS 2006=2008 Geographical Areas
what s available in the acs via look up tables
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)
not ready for prime time census tracts and zip codes
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
zip codes
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
what to do with a 2011 release of zip code data
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
what are pumas
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
pumas
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.
pumas1
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
puma to county widget
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
class exercises today
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
pumas via maps
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

pumas via text
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
metropolitan areas
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