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Data Quality and the ACS Introduction to the ACS Aggregator. Lisa Neidert January 18, 2012 PSC Data Workshop Ann Arbor, MI. Synopsis . Census long-form data were not as good as you thought ACS data are worse Collapse cells or combine geographies Tool: ACS Aggregator [Beta]. - PowerPoint PPT Presentation
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Data Quality and the ACS
Introduction to the ACS Aggregator
Lisa Neidert
January 18, 2012PSC Data WorkshopAnn Arbor, MI
Synopsis
Census long-form data were not as good as you thought
ACS data are worse
Collapse cells or combine geographies
Tool: ACS Aggregator [Beta]
ACS Data Quality Issues
Sample Size 1 in 8 instead of 1 in 6
Mixed Mode Non-response is a ~1 in 3 sample Uneven response across geography
Population Controls Only at state/county Long-form data had short-form
Geographic Variation in ACS mail response: by pseudo county (2006-2008)
Census Bureau Solutions
Increase sample size 3.4 million households
Re-distribute sample Small census tracts + Low response areas + Large census tracts; high response areas –
Research
Education
PSC ACS Aggregator
Helps users re-calibrate margins of error after combining geographies or collapsing cells
Statistical Review
Compass Series: Technical Appendix
ACS Aggregator
Practice Data
Seattle: Capitol Hill Neighborhood Table B11001
Combine Geographies
Enter Name, Estimate, MOE for all geographies
Collapse Cells
Enter Name, Estimate, MOE for each column Geographies will be repeated