BLS has painstaking protocols so the figures are not tampered with. Its officials lock the rooms where they crunch the numbers. They so prize secrecy that they put their trash cans outside their sealed offices so office workers don’t accidentally get a hint of the numbers before they’re made public.
The monthly report is based on two surveys. One is the household survey, which produces the unemployment rate, and the establishment survey, which produces the number of jobs added or lost each month.
via CNN 
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