IPUMS Ancestry Full Count Data: Version 4.0
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IPUMS USA makes freely available to researchers worldwide full count U.S. Census microdata through 1950. This dataset includes over 780 million individual-level (1850-1950) and 7.5 million household-level records (1790-1840). The microdata represents the fruition of longstanding collaborations between IPUMS and the nation's two largest genealogical organizations —Ancestry.com and FamilySearch— to leverage genealogical data for scientific purposes. This microdata collection is possible due to the donations of an unprecedented scale of digitized census data by both Ancestry.com and FamilySearch. Person-level microdata are available from 1850-1950. Complete count data for 1790-1840 are available at the household-level. In contrast to the 1850-1950 U.S. censuses, the 1790-1840 historical censuses named only the head of the household and tallied household totals attached to that record. IPUMS is continually improving the quality of these datasets by removing duplicate records, improving identification of household groups, applying numeric codes to the transcribed responses, etc. These improvements to the underlying data are periodically released via IPUMS USA. Updates since Version 3.0 include improvements to data from 1850-1880 released in October 2023, and the preliminary release of the 1950 data in January 2024 (see more at https://usa.ipums.org/usa/full_count.shtm ). The variable VERSIONHIST identifies the public-release version of a dataset. Researchers can merge data between versions of the dataset using HISTID to link individual cases across versions, capturing any updates, corrections, or improvements that may have been applied to the data. All data are coded and can be downloaded via the IPUMS USA extract system. Restricted versions of these datasets are also available.
IPUMS USA 向全球研究人员免费提供截至1950年的美国人口普查全量微观数据。本数据集包含1850年至1950年的超7.8亿条个体级记录，以及1790年至1840年的750万条家庭级记录。该微观数据是IPUMS与美国两大顶尖家谱机构Ancestry.com、FamilySearch长期合作的成果，旨在将家谱资源应用于科学研究。这一微观数据集的推出，得益于Ancestry.com与FamilySearch捐赠的大规模数字化普查数据，其规模前所未有。1850年至1950年可获取个体级微观数据，而1790年至1840年的全量普查数据仅提供家庭级版本。与1850年至1950年的美国人口普查不同，1790年至1840年的历史普查仅记录户主姓名，并在该条记录下统计家庭总人口数。IPUMS 持续通过剔除重复记录、优化家庭组识别、为转录的普查响应内容分配数字编码等方式提升数据集质量，相关底层数据改进会通过IPUMS USA定期发布。自3.0版本以来的更新包括2023年10月发布的1850年至1880年数据优化，以及2024年1月发布的1950年数据预发布版（详细信息请参阅https://usa.ipums.org/usa/full_count.shtm）。变量VERSIONHIST用于标识数据集的公开发布版本。研究人员可通过HISTID字段实现不同版本数据集的合并，跨版本关联个体样本，以捕捉数据在更新、修正与优化后的所有变化。所有数据均已完成编码，可通过IPUMS USA提取系统下载。本数据集同时提供受限访问版本。
