NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Concording U.S. Harmonized System Categories Over Time

Justin R. Pierce, Peter K. Schott

NBER Working Paper No. 14837
Issued in April 2009
NBER Program(s):   ITI

This paper: outlines an algorithm for concording U.S. ten-digit Harmonized System export and import codes over time; describes the concordances we construct for 1989 to 2004; and provides Stata code that can be used to construct similar concordances for arbitrary beginning and ending years from 1989 to 2007.

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Document Object Identifier (DOI): 10.3386/w14837

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