NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH
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Jack Liang

Department of Economics
Yale University
28 Hillhouse Ave
New Haven, CT 06511

E-Mail: EmailAddress: hidden: you can email any NBER-related person as first underscore last at nber dot org
Institutional Affiliation: Yale University

NBER Working Papers and Publications

February 2020A Method to Construct Geographical Crosswalks with an Application to US Counties since 1790
with Fabian Eckert, Andrés Gvirtz, Michael Peters: w26770
Empirical researchers often have to map data provided for a "reporting" spatial unit, say counties in 1900, to a "reference" one, say, counties in 2010. We discuss a general method to create such crosswalks: computing the share of the area of each reporting unit nested in a given reference unit. Using these shares, data can be re-aggregated from the reporting to the reference units. We apply the method to construct a crosswalk for US county-level data since 1790 to present-day counties or commuting zones. We also provide the code to generate other crosswalks given maps of reporting and reference units.
 
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