The annual revision is benchmarked to state tax records. From the BLS:
Each year, the Current Employment Statistics (CES) survey estimates are benchmarked to comprehensive counts of employment from the Quarterly Census of Employment and Wages (QCEW) for the month of March. These counts are derived from state unemployment insurance (UI) tax records that nearly all employers are required to file. On September 26, 2013 at 10:00 a.m. the Bureau of Labor Statistics (BLS) will release the preliminary estimate of the upcoming annual benchmark revision to the establishment survey employment series.With the release of the final benchmark estimate in February, total payroll employment in March 2013 will changed by the amount of the revision. The number is then "wedged back" to the previous revision (March 2012).
For details on the benchmark revision process, see from the BLS Benchmark Article.
The following table shows the benchmark revisions since 1979. The BLS employment estimate tends to miss turning points - as an example the benchmark revisions were down in 2007 through 2010, and have been up for the last two years. We see a similar pattern for previous recessions (like in the early '80s and early '90s). My guess is the revision will be small this year.
A few months ago Josh Lehner looked at state level data and he thinks the revision will be positive again this year. Although he thinks the revision for government employees may be larger than normal due to the sequester. According to MarketWatch, economists at BNP Paribas expect a negative revision.
Year | Percent benchmark revision | Benchmark revision (in thousands) |
---|---|---|
1979 | 0.5 | 447 |
1980 | -0.1 | -63 |
1981 | -0.4 | -349 |
1982 | -0.1 | -113 |
1983 | * | 36 |
1984 | 0.4 | 353 |
1985 | * | -3 |
1986 | -0.5 | -467 |
1987 | * | -35 |
1988 | -0.3 | -326 |
1989 | * | 47 |
1990 | -0.2 | -229 |
1991 | -0.6 | -640 |
1992 | -0.1 | -59 |
1993 | 0.2 | 263 |
1994 | 0.7 | 747 |
1995 | 0.5 | 542 |
1996 | * | 57 |
1997 | 0.4 | 431 |
1998 | * | 44 |
1999 | 0.2 | 258 |
2000 | 0.4 | 468 |
2001 | -0.1 | -123 |
2002 | -0.2 | -313 |
2003 | -0.2 | -122 |
2004 | 0.2 | 203 |
2005 | -0.1 | -158 |
2006 | 0.6 | 752 |
2007 | -0.2 | -293 |
2008 | -0.1 | -89 |
2009 | -0.7 | -902 |
2010 | -0.3 | -378 |
2011 | 0.1 | 162 |
2012 | 0.3 | 424 |
2013 | NA | NA |
* less than 0.05% |
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