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NCHS Research and Development Survey (RANDS) Round 2 during COVID-19 non-probability sampled Restricted File

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CDC Chronic Disease Data and Surveillance2025-04-21 更新2026-05-22 收录
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The Research and Development Survey (RANDS) is a series of cross-sectional surveys from probability-sampled commercial survey panels. As part of a special iteration of RANDS that focuses on COVID-19, RANDS during COVID-19 Round 2 is the second round of a three-round survey. In addition to the probability sample of RANDS during COVID-19 Round 2, the questionnaire was administered to the Dynata non-probability online opt-in sample by NORC at the University of Chicago (NORC) from August 3, 2020 to August 20, 2020. The RANDS during COVID-19 Round 2 Non-Probability Sample does not have a known survey sampling design and cannot be used to produce nationally or sub-nationally representative estimates.

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2022-06-02
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