Data Quality and the ACS Introduction to the ACS Aggregator Lisa Neidert January 18, 2012 PSC Data Workshop Ann Arbor, MI.
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Transcript Data Quality and the ACS Introduction to the ACS Aggregator Lisa Neidert January 18, 2012 PSC Data Workshop Ann Arbor, MI.
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]
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
Questions/Comments
E-mail [email protected]