...about BEA Methodology...
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The BEA uses a variety of data sources, including those from government agencies, other BEA accounts, and private companies, to produce a GDP forecast. These sources include monthly or quarterly data, trend-based data, and indicators. The most common sources are "monthly or quarterly data" and "monthly and trend-based data," which together account for about 75% of the data used for advance estimates, according to a BEA paper.
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Link: https://www.bea.gov/resources/methodologies
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