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

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.

《研究与开发调查》（RANDS）是一系列基于概率抽样的商业调查横断面调查。作为RANDS特别迭代的一部分，该迭代聚焦于COVID-19，RANDS在COVID-19第二轮调查是三轮调查的第二次。除了RANDS在COVID-19第二轮的概率抽样样本外，问卷还由芝加哥大学NORC（国家意见研究中心）于2020年8月3日至8月20日对Dynata非概率在线自愿样本进行了发放。RANDS在COVID-19第二轮的非概率样本缺乏已知的调查抽样设计，因此无法用于产生全国或地区代表性的估计。（Probability Sample）