The data sources and methods used in the preparation of the
manufacturing series differ from those used in preparing the business and nonfarm business series, and these measures are not directly comparable.
Output measures for business and nonfarm business are based on measures of gross domestic product prepared by the Bureau of Economic Analysis of the U.S. Department of Commerce. Quarterly output measures for manufacturing reflect indexes of industrial production independently prepared by the Board of Governors of the Federal Reserve System.
See Technical Notes for further information on data sources at http://www.bls.gov/news.release/pdf/prod2.pdf.
US Dept Of Labor - Bureau of Labor Statistics
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