Name File Type Size Last Modified
  crosswalks 09/17/2021 06:26:PM
  replication-files 09/17/2021 06:46:PM
  teaching-material 09/17/2021 06:42:PM
readme.docx application/vnd.openxmlformats-officedocument.wordprocessingml.document 15.1 KB 09/18/2021 07:15:AM

Project Citation: 

Ferrara, Andreas, Testa, Patrick A., and Zhou, Liyang. New Area- and Population-based Geographic Crosswalks for U.S. Counties and Congressional Districts, 1790-2020. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 2021-09-18.

Project Description

Summary:  View help for Summary A common problem in applied research involves harmonizing geographic units across time or different levels of aggregation. We provide crosswalks that allow researchers i) to harmonize U.S. county boundaries over time across Census decades and ii) to generate congressional district level variables from county-level data. The crosswalks include an area-based approach as in Hornbeck (2010), as well as the new population-based methods from Ferrara, Testa, and Zhou (2021), which are based on granular sub-county population information. We also provide teaching material to demonstrate the utility of these new crosswalks.

Scope of Project

Geographic Coverage:  View help for Geographic Coverage USA
Time Period(s):  View help for Time Period(s) 1790 – 2020
Universe:  View help for Universe U.S. counties and congressional districts
Data Type(s):  View help for Data Type(s) geographic information system (GIS) data

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