IPUMS Ancestry Full Count Data: Version 3.0R

IPUMS USA makes freely available to researchers worldwide complete count U.S. Census microdata through 1940. This dataset includes over 650 million individual-level (1850-1940) 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 1850-1940. Complete count data for 1790-1840 are available at the household-level. In contrast to the 1850-1940 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. 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. Restricted version of IPUMS Ancestry Full Count data, spanning 1790 to 1940. This version of the data includes string variables, including the name fields, and information to link individual cases to the digital images. Users of the restricted data must have an approved sublicense and user agreement. These data are restricted to protect Ancestry’s business interest in these data transcriptions.

IPUMS USA 面向全球研究人员免费提供截至1940年的完整美国人口普查微观数据（microdata）。该数据集包含超过6.5亿条1850年至1940年的个人层面（individual-level）记录，以及750万条1790年至1840年的家庭层面（household-level）记录。本微观数据集是IPUMS与美国两家顶级家谱机构Ancestry.com及FamilySearch长期合作的成果，旨在将家谱资源应用于科学研究，其建成依托于两家机构捐赠的超大规模数字化普查数据。个人层面微观数据的覆盖时段为1850年至1940年；1790年至1840年的完整普查数据仅提供家庭层面版本。与1850-1940年的美国人口普查不同，1790-1840年的历史人口普查仅记录户主姓名，并统计绑定于该家庭记录的家庭总量信息。IPUMS 持续通过移除重复记录、优化家庭组识别、为转录应答分配数字编码等方式提升数据集质量，相关改进会定期通过IPUMS USA发布。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字段在不同数据集版本间进行合并，以关联不同版本中的个体案例，获取数据所经历的更新、修正与优化内容。所有数据均已完成编码，可通过IPUMS USA数据提取系统下载。此外还提供受限版本数据集：覆盖1790年至1940年的IPUMS Ancestry完整普查数据受限版，该版本包含字符串变量（含姓名字段）以及用于将个体案例关联至数字影像的相关信息。受限数据的使用者必须持有经批准的分许可协议与用户协议，此类数据设置受限是为了保护Ancestry在其数据转录成果中的商业权益。

搜集汇总

背景与挑战

背景概述

该数据集是IPUMS Ancestry的完整计数数据受限版本（Version 3.0R），涵盖1790年至1940年，包含姓名等字符串变量以及链接到数字图像的信息，需经批准的子许可才能访问，旨在保护Ancestry的商业利益。