"The IPUMS National Historical Geographic Information System (NHGIS) provides free online access to summary tables and GIS files for U.S. censuses and surveys from 1790 through the present. NHGIS also provides two unique resources to help analysts investigate changes across time in geographic areas. First, time series tables link together comparable summary statistics from multiple years for several geographic levels, down to census tracts and block groups. For most subjects, time series tables extend from 1970 through the most recent American Community Survey (ACS) data. The geographically standardized tables—which provide data for fixed geographic extents—span from 1990 to 2020. NHGIS also provides geographic crosswalks, which support the allocation of data from one year’s units to another’s, allowing analysts to construct geographically standardized data for subjects, years, and levels that aren’t covered in the time series tables. In this webinar, IPUMS geographer Jonathan Schroeder will provide an overview of NHGIS time series tables and crosswalks, describing their key features, their unique advantages, how to find and use them, important considerations for their use, and future planned extensions."
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