NCHS Research and Development Survey (RANDS) Round 1 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 1 is the first round of a three-round survey. In addition to the probability sample in RANDS during COVID-19 Round 1, the questionnaire was administered to the Dynata non-probability online opt-in sample by NORC at the University of Chicago (NORC) from June 9, 2020 to June 30, 2020. The RANDS during COVID-19 Round 1 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横断面调查，这些调查由商业调查面板进行。作为RANDS针对COVID-19专项研究的特别迭代之一，COVID-19第一轮的RANDS调查是该三项调查的第一轮。除了RANDS在COVID-19第一轮中的概率样本外，问卷还由芝加哥大学（NORC）的NORC团队在2020年6月9日至6月30日期间，对Dynata的非概率在线自愿样本进行了发放。RANDS在COVID-19第一轮的非概率样本缺乏已知的调查抽样设计，因此无法用于生成全国或地区层面的代表性估计。（Non-Probability Sample）