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County-to-County Migration Products
Robert Kominski, Asst Chief, HHES
2010 SDC Steering Committee Meeting
June 16, 2010
U.S. Census Bureau
Suitland, MD
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Decennial Census Products
1990 Census Special Project 312 –
County-to-County Migration Flow Files (CD)
21 County-to-County tables crossed by multiple characteristics
Used “GO” display/retrieval software
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Decennial Census Products
Census 2000 Migration Data DVD
County-to-County Tables:1 general table– no restrictions
19 single characteristic tables – rounding
22 multiple characteristic tables - rounding & restricted to flows of 3 or more unweighted cases
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ACS Migration Flow Products
STANDARD Products in AFF
Tables with In-Migration by Characteristics• Since 2004 ACS• All publishable geographies
Tables with Out-Migration by Characteristics• Since 2007 ACS• Limited geographies
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ACS Migration Flow Products
• Age• Sex• Race/Hispanic
Origin• Citizenship• Marital Status
• Educational Attainment
• Individual Income• Poverty Status• Tenure
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Characteristic Crossed for AFF Migration Tables
ACS Migration Flow Products
SPECIAL Products
State-to-State Migration Flow Tables
• Published since 2005 ACS• 52 x 52 table• Shows state of current residence by state of residence 1 year ago (no characteristics)• NOT a part of standard products
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2005-2009 ACS 5-Year Dataset
First time ACS publishes data for all counties (3,143 in 2009)
However: AFF currently cannot support flow products
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Possible Products ??
Not only County-to-County, but:
Place-to-PlaceMCD-MCD (12 states)MCD-to-CountyCounty-to-MCDCBSA-to-CBSAMetro Area-to-Metro Area
A LOT of stuff!
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Issues
• Smaller sample size, larger MOE• Fewer movers (residence 1 year ago
vs. 5 years ago question)• Periodicity – new data each year
Disclosure issues• 50 case limit on residence 1 year ago tables
Not part of basic production
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Similar Problem: Journey to Work• Census Transportation Planning Products
– Previously created tables of characteristics, and Home to Work Flows by characteristics from decennial data
– Currently working on a preliminary ACS 3-year product
– # of crosses for flows minimized to 5 variables due to disclosure avoidance requirements
– Disclosure issues will still be an issue for an ACS 5-year CTPP product being planned
Latest idea – Synthetic Data Approach10
Next Steps
• Possible research product using 2005- 2009 ACS
• File available late 2010• Flow table only – no characteristics
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What Are Your Greatest Needs ?
Email:Alison Fields, ChiefJourney to Work and Migration Statistics [email protected]
More information on migration special products can be found at:
www.census.gov/population/www/socdemo/migrate.html
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