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Finding Census Data

Finding Census Data. The (Very) Basics. Decennial Census. Purpose is _____________________. 2000 Census first in which primary medium is electronic, although most 1990 data is available online, too. Logic of the Data Releases.

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Finding Census Data

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  1. Finding Census Data The (Very) Basics

  2. Decennial Census • Purpose is _____________________. • 2000 Census first in which primary medium is electronic, although most 1990 data is available online, too.

  3. Logic of the Data Releases • Public Law (P.L.) data – data necessary for voting district configuration • over 18; total population; race • Summary File 1 – Short form data (100%) • Summary File 3 – Long form data (sample)

  4. P.L. Data Population, total and over 18 (voting) Race and ethnicity SF1 Age & sex Race & ethnicity Household relationships Housing units & tenure data; vacancy characteristics Group quarters data Urban/rural Content of the Data Releases

  5. SF3 – Population Age (cross-tab) Race & ethnicity (cross-tab) Marital Status Employment & Income Language spoken at home, ancestry & migration Military service Farm residence Disability Grandparents as caregivers School enrollment & educational attainment SF3 – Housing Heating fuel & fuel cost Number of rooms & bedrooms Occupation, industry, class of worker; work status in 1999 Year structure built & units in structure Telephone service Plumbing & kitchen facilities Utilities, mortgage, taxes, insurance Value of home/monthly rent paid Vehicles available Year moved into residence Content of the Data Releases

  6. Census GeographyAn Abbreviated Hierarchy AIANHH Nation State ZCTA 3- and 5-digit summary levels Cong. District County Place (Muncipalities & CDPs) Cnty Subdivision (Township) Census Tract Block Group Block AIANHH - American Indian/Alaskan Native/Hawaiian Homelander CDP - Census Designated Place ZCTA - Zip Code Tabulation Area—never to be confused with a Zip Code

  7. FactFinder Get a quick summary

  8. Maps • Direct Line to Tract Maps: http://ftp2.census.gov/plmap/pl_trt/

  9. Maps • Navigating to Tract Maps • http://www.census.gov/ • Geography: Maps >>Map Products: >>REFERENCE MAPS: Census Geography: Census Tract Outline Maps >>will let you choose either 2000 or 1990

  10. Exercise – Home Town Park • Think of a park you know. From the directory, choose the state it’s in, then the county. (If you don’t know the county, use Pullen Park in Wake County, North Carolina.) • The first map in each directory ends in _000.pdf. This is the index map which shows the county covered by a numbered grid. Use it to find the grid cell that covers the area in which your park is located and note the number of the cell. • Now go back to the list of maps. The grid cell numbers correspond to the numbered maps in the directory—choose the map with that cell number to get a detailed view of the area. Locate the park and copy down the tract numbers surrounding it. (For this exercise use just the tracts immediately adjacent. In real life, you’d have to estimate the radius.)

  11. Get to the Data • Factfinder • http://factfinder.census.gov • On left, Data Sets—Decennial Census • On this page, select the summary file you want by its radio button • On the right, click the Detailed Tables link

  12. FactFinder Get detailed data

  13. FactFinder Get detailed data Choose your summary file, 1 or 3, by the variables you need Description of Variables included

  14. Get to the Data – Geographies Select Geographic Type >> Census Tract Select state—county—tract numbers “Add” to selections box Click Next button

  15. FactFinder- Geographies Change Geographic Type to Tract using the dropdown menu { Drill down to the state & county you need Select the tract(s) you need from the list Add them to your selections Click Next

  16. Get to the Data – Variables Select from All Tables or use Keyword tab to search for terms Highlight table (use What’s This to scout) “Add” to selections box Click Show Result button

  17. FactFinder - Variables To see table shell

  18. Make GIS-ready • Find Options link in header >>Show Geographic Identifiers • After you download the data (instructions next slide)

  19. Make GIS-Ready Selecting this option will add the Identifiers (all of them) as another table in your results.

  20. Download the Data Find Print/Download link in header Download Select format (and transposition if wish) Click OK—Open or Save file

  21. Download the Data

  22. After the Download • You can delete the extraneous Geographic Identifier variables. What you’ll need are just the FIPS code variables that provide a unique identifier for each tract— • under GEOGRAPHIC AREA CODES: County, and Census Tract • You’ll need to “concatenate” these fields (Excel function) before joining table to GIS map

  23. Make GIS-Ready This is a long list of codes most of which you won’t need. What you will need are:

  24. For More Information, Contact Michele Hayslett Data Services Librarian NC State University Libraries Raleigh, NC (919) 513-4433 Michele_Hayslett@ncsu.edu

  25. Important Distinctions • Race versus Ethnicity • Household versus Family • Metropolitan versus Urban

  26. Primary Resources for GIS Census Data • Search http://www.lib.ncsu.edu/gis/ for “Census” • Lots of existing layers with Census attributes • Most common geographic levels • If can’t find variables you need there…

  27. GeoLytics discs NR Library or D. H. Hill Georeferenced and easily downloaded in shape file format 1970 through 2000 data available Quirky DOS program; may encounter errors No ACS data American FactFinder http://factfinder.census.gov Not georeferenced – must be joined to a GIS layer (but .shp files coming soon!) 1990, 2000 decennial data and ACS data 2000 data has Geo within Geo option 20-minute limit Primary Resources for GIS Census Data

  28. Online Resources • Starting guide to finding Census resources http://www.lib.ncsu.edu/data/cendata.html • User guide for GeoLytics resources http://www.lib.ncsu.edu/data/giscensusdata.html

  29. Future of the Census: American Community Survey (ACS) • Will replace the long form and provide data every year —but as a multi-year average for geographies with less than 65,000 people • Began w/ testing in 2003 and in full operation by 2010

  30. American Community Survey • Rolling survey of certain number each month with telephone and personal followups • 2005 – data available for areas of 65,000+ • 2007 – data available for areas of 20,000 – 65,000 • 2010 – data available for areas smaller than 20,000 • More information at http://www.census.gov/acs/www/

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