Concording U.S. Harmonized System Codes over Time

摘要: Monitoring changes to product classi…cation systems is an important component of a wide range empirical research. In this paper we develop alogorithm for concording periodic revisions the ten-digit Harmonized System (HS) codes used by U.S. statistical agencies categorize international trade since 1989. We use algorithm construct …rst comprehensive concordance HS over time, and show how can be extended incorporate future revisions. then characterize extent HS-code 1989 discuss controlling these critical understanding growth trade. JEL classi…cation: F1 Schott thanks National Science Foundation (grants SES-0241474 SES-0550190) Yale School Management research support. thank Julie Linden University Social Sciences Library generous help in securing data. Mayumi Hairston Escalante advice provision unpublished Census “obsolete-new”…les. The was undertaken while Pierce at Georgetown University. Any opinions conclusions expressed herein are those authors do not necessarily represent views Bureau or Foundation. y4600 Silver Hill Road, Washington, DC 20233, email: justin.r.pierce@census.gov; telephone: 301-763-6469; fax: 301-763-5935. z135 Prospect Street, New Haven, CT 06520, tel: (203) 436-4260, 432-6974, peter.schott@yale.edu. A Concordance Codes Over Time 2