Each year, historical labor force estimates are revised to reflect
new Census Bureau population controls, updated input data, and
reestimation. The model-based estimates also incorporate new seasonal
adjustment, and the unadjusted estimates are controlled to new census
division and U.S. totals. Substate area data are revised to incorporate
updated inputs, reestimation, and controlling to new statewide totals.
On February 28, 2014, the Local Area Unemployment Statistics (LAUS) program
released 2013 annual average labor force estimates for census regions and divisions;
all States and the District of Columbia; the Los
Angeles-Long Beach-Glendale, CA Metropolitan Division, the Miami-Miami
Beach-Kendall, FL Metropolitan Division, the Chicago-Joliet-Naperville, IL
Metropolitan Division, the Detroit-Warren-Livonia, MI Metropolitan
Statistical Area, New York city, NY, the Cleveland-Elyria-Mentor, OH Metropolitan Statistical
Area, and the Seattle-Bellevue-Everett, WA Metropolitan Division, as well as the
seven corresponding balance-of-State areas. As described above, the
data incorporate new population controls, updated inputs,
reestimation of models, and adjustment to new census division and national
control totals. Both not-seasonally-adjusted and smoothed-seasonally-adjusted (SSA)
monthly data were revised back to January 2009. (For more information about
SSA, please see the question and
answer page.) The updated population controls reflect U.S. Census Bureau
revisions from April 2010 forward.
Statewide SSA data for Puerto Rico were revised back to 2009 to incorporate updated seasonal factors. Not-seasonally-adjusted
data for Puerto Rico are tabulated from a household survey and generally are not subject to historical revision.
All annual average and historical supplemental items on the website containing data for model-based areas,
including data files, rank tables, and maps, were updated on February 28 to reflect these revisions.
On April 18, 2014, routine revisions were made to data from 2009 through 2013 for geographic areas below the State level (other than the model-based areas
noted above), and official annual averages for 2013 were issued. For many substate areas, at least some estimation inputs were revised back to 2010, while the
revisions for 2009 consisted of controlling to the new State totals described above. The extent and scope of the substate data revisions were footnoted within
the time-series database. Furthermore, all supplemental items on the website containing data for substate areas were updated to reflect these revisions.
Last Modified Date: April 18, 2014