1. County-to-County Migration Products Robert Kominski, Asst Chief, HHES 2010 SDC Steering Committee Meeting June 16, 2010 U.S. Census Bureau Suitland, MD 1

2. 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 2

3. 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 3

4. 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 4

5. ACS Migration Flow Products Age Sex Race/Hispanic Origin Citizenship Marital Status Educational Attainment Individual Income Poverty Status Tenure 5 Characteristic Crossed for AFF Migration Tables

6. 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 6

7. 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 7

8. Possible Products ?? Not only County-to-County, but: Place-to-Place MCD-MCD (12 states) MCD-to-County County-to-MCD CBSA-to-CBSA Metro Area-to-Metro Area A LOT of stuff! 8

9. 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 9

10. 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 Approach 10

11. Next Steps Possible research product using 2005-2009 ACS File available late 2010 Flow table only – no characteristics 11

12. What Are Your Greatest Needs ? Email: Alison Fields, Chief Journey to Work and Migration Statistics Branch Alison.K.Fields@census.gov More information on migration special products can be found at: www.census.gov/population/www/socdemo/migrate.html 12