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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