UNCTAD, in collaboration with IMF, initiated a new project in May 2010
to build this time-series database based on the longest standing product
nomenclature, namely, the Standard International Trade Classification,
Revision 1 (SITC Rev.1) and develop an application to manipulate the
The database draws raw tariff data from various sources that include
UNCTAD TRAINS Harmonized system database, WTO IDB database, GATT Tariff
Study files, and International Customs Tariff Bureau (BITD) files
purchased by IMF (converted by IMF in SITC Revision 1 classification),
standardized and transferred to a single historical database.
This new application allows researchers to, inter alia, construct trade
restrictiveness indices (TRIs) that overcome the weaknesses inherent in
the indices that have been used to date - the simple average tariff rate
and the others mentioned above.
The new database is a homogenous analytical one of tariff and import
statistics from 1970 to the present. The package of the database and the
application is available as UNCTAD Long Time-Series TRAINS database. The
use of SITC Rev 1 product classification enables easy multi-country,
This document provides a brief introduction to the Long Time-Series
version of UNCTAD Trade Analysis and Information System (LST TRAINS),
and shows you how to build queries and retrieve data through a series of
demonstrations and examples.
Anon. Trade Analysis and Information System Long Time-Series Version (LTS TRAINS) User’s Manual. Version 1.0, October 2011. UNCTAD, Geneva, Switzerland (2011) 38 pp.
Trade Analysis and Information System Long Time-Series Version (LTS TRAINS) User’s Manual. Version 1.0, October 2011.