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Technical Notes Information and computer technologies (ICT) Sector Information and computer technologies (ICT) is made up of the following industries (and removed from their usual category), NAICS 334 (Computer and electronic products), NAICS 517 (Telecommunications), NAICS 5415 (Computer systems design and related services), and NAICS 51 (Information) except traditional paper publishers. This definition is generally comparable to that used by the Organization for Economic Cooperation and Development (OECD), which defines the ICT sector using the International Standard Industrial Classification (ISIC) (OECD 2011). Capital Services Data on investment for fixed assets are obtained from BEA. Data on inventories are estimated using data from BEA and additional information from IRS Corporation Income Returns. Data for land in the farm industry are obtained from USDA. Nonfarm industry detail for land is based on IRS book value data. Current-dollar value-added data, obtained from BEA, are used in estimating capital rental prices. Labor Input Hours at work data reflect Productivity and Costs data as of the September 3, 2020 “Productivity and Costs” news release (USDL-20-1649). The growth rate of labor composition is defined as the difference between the growth rate of weighted labor input and the growth rate of the hours. Intermediate Inputs Data on intermediate inputs are obtained from BEA based on BEA annual input-output tables. Tornqvist indexes of each of these three input classes are derived at the NAICS industry level and then aggregated to the industries. Materials inputs are adjusted to exclude transactions between establishments within the same industry. Sectoral Output The output concept used to measure total factor productivity for industries is “sectoral output”. Sectoral output equals gross output (sales, receipts, and other operating income, plus commodity taxes plus changes in inventories), excluding transactions between establishments within the same industry. This is not the same output measure used for private business and private nonfarm business is “real value-added output”, described below in “Real Value-Added Output” section. Industry output measures for 2018 and earlier years are constructed primarily using data from the economic censuses and annual surveys of the U.S. Census Bureau together with data on price changes primarily from BLS. These measures have been revised due to new and revised data from the Bureau of Economic Analysis, used in part to construct intra-industry transactions. Manufacturing industry output for 2019 is estimated based on historical relationships between BLS industrial output, BLS price indexes, and data on industrial production from the Federal Reserve Board. Data from the Quarterly Services Survey from the Census Bureau are used to construct preliminary output measures for 2019 for some industries. Real Value-Aded Output Concept Used for Private Business and Private Nonfarm Business Sectors Real value-added output in private business equals gross domestic product less general government, government enterprises, private households (including the rental value of owner-occupied real estate), and non-profit institutions. Real value-added output excludes intermediate transactions between businesses. Other information Comprehensive tables containing more detailed data than that which is published in this press release are available upon request at 202-691-5606 or at www.bls.gov/mfp/mprdload.htm. Industry specific contributions to output are available at www.bls.gov/mfp/contributions-to-output.htm. More detailed information on methods, limitations, and data sources of capital and labor are provided in BLS Bulletin 2178 (September 1983), Trends in Multifactor Productivity, 1948-81 and on the BLS Multifactor Productivity website under the title “Technical Information About the BLS Multifactor Productivity Measures” for Major Industrys and 18 NAICS industry Manufacturing Industries at www.bls.gov/mfp/mprtech.pdf. General information is available on the BLS Multifactor Productivity website at www.bls.gov/mfp/mprover.htm. Additional data not contained in the release can be obtained in print or at www.bls.gov/mfp. A number of comprehensive tables set up as zip files can be obtained at www.bls.gov/mfp/mprdload.htm. Methods for measuring manufacturing multifactor productivity are discussed in the July 1995 issue of the Monthly Labor Review, "Measurement of productivity growth in U.S. manufacturing”. See www.bls.gov/mfp/mprgul95.pdf.