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For each HRMS round, a stratified random sample of adults ages 18-64 is drawn from the Knowledge Panel, a probability-based, nationally representative Internet panel maintained by Ipsos. The approximately 55,000 adults in the panel include households with and without Internet access. Panel members are recruited from an address-based sample frame derived from the United States Postal Service Delivery Sequence File, which covers 97 percent of United States households. The 2020 HRMS sample includes 9,032 nonelderly adults, including oversamples of low-and moderate-income adults by race and ethnicity and an oversample of adults ages 18 to 29.每一轮HRMS调研均从益普索（Ipsos）维护的知识库面板（Knowledge Panel）中抽取18至64岁成年人的分层随机样本。该面板为基于概率抽样的全国代表性互联网调研面板，约包含5.5万名成年人，其所属家庭既包含具备互联网接入的家庭，也包含无互联网接入的家庭。面板成员通过取自美国邮政投递序列文件（United States Postal Service Delivery Sequence File）的地址抽样框招募，该文件覆盖了97%的美国家庭。2020年HRMS样本包含9032名非老年成年人，其中涵盖按种族与族裔划分的低收入及中等收入成年人超额抽样组，以及18至29岁成年人的超额抽样组。