FILE - In this July 25, 2012, file photo, people looking for work attend a job fair in San Jose, Calif. Every January, the U.S. government updates the formulas it uses to calculate

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FILE - In this July 25, 2012, file photo, people looking for work attend a job fair in San Jose, Calif. Every January, the U.S. government updates the formulas it uses to calculate unemployment data, which sometimes results in a revision of the monthly unemployment rates. On Friday, Jan. 4, 2013, the government revised the unemployment rates for two months in 2012. The rate for November, first reported Dec. 7, was revised up to 7.8 percent from 7.7 percent. And the rate for July was revised down to 8.2 percent from 8.3 percent. (AP Photo/Paul Sakuma, File) less