Data Quality and the ACS Introduction to the ACS Aggregator

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Presentation transcript:

Data Quality and the ACS Introduction to the ACS Aggregator Lisa Neidert May 18, 2012 SEMCC Lunch & Learn Schoolcraft College | Livonia, 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

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 mail response across geography Population Controls Only at state/county Long-form data had short-form

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 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 Detroit: Skillman Good Neighborhoods Table B1100, ACS 2006-2010

Combine Geographies Enter Name, Estimate, MOE for all geographies

Collapse Cells Enter Name, Estimate, MOE for each column Geographies will be repeated

Questions/Comments E-mail lisan@umich.edu