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Tract Mapping with the American Community Survey

Tract Mapping with the American Community Survey. Carol O. Rogers Deputy Director and CIO. Rachel Justis Geodemographic Analyst. What are the ACS 5-year estimates?. First-ever released December 14, 2010 NOT Census 2010 data

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Tract Mapping with the American Community Survey

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  1. Tract Mapping with the American Community Survey Carol O. Rogers Deputy Director and CIO Rachel Justis Geodemographic Analyst

  2. What are the ACS 5-year estimates? First-ever released December 14, 2010 • NOT Census 2010 data • Data collected from January 1, 2005 to December 31, 2009 and are an average for the entire period. • Available for every state, county, city, town, place, as well as for census tracts and block groups.

  3. The estimates cover many topics • Education • Industry • Place of work • Travel time • Heating fuel • Type of home (bedrooms, age, bathrooms) • Income, poverty • Much more …

  4. Are the estimates any good? • Sure, if used properly. • Users should pay attention to the margin of error. • If it is bigger than the estimate, use caution. • Useful for planning and context.

  5. Margins of error get larger as the size of the population gets smaller

  6. Fast Facts about Tracts • 1,414 tracts statewide • Relatively equal population • Can cross city-town boundaries, but are completely contained in a single county • Semi-permanent, but boundaries can change File layout example:

  7. Northeast Marion County Tract Changes 2010 2000 These tracts were combined These tracts were split

  8. A Closer Look at Kosciusko County

  9. Linguistically Isolated Spanish-Speaking Households in Kosciusko County

  10. Remember that these data are based on a survey. • The population covered by the sample ranges from 23 – 3,175 people (Average: 356) • The number of housing units in the sample ranges from 9 – 1,043 units (Average: 151)

  11. Where does that leave us? • Use the data, but don’t ignore the margins of error!

  12. Census 2010 • Counts, not estimates • But not much data: population,age, race, sex, housing units vacant, occupied www.stats.indiana.edu Go to the Census Topic Page

  13. Obtaining the data STATS Indiana www.stats.indiana.edu American FactFinder Factfinder.census.gov Or send requests to ibrc@iupui.edu

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