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Because many developing countries fail to report trade statistics to the United Nations, there has been an interest in using partner-country data to fill these information gaps. The author used partner-country statistics for 30 developing countries to estimate actual (concealed) trade data and analyzed the magnitude of the resulting errors. The results indicate that partner-country data are unreliable even for estimating trade in broad aggregate product groups such as foodstuffs, fuels, or manufactures. Moreover, tests show that the reliability of partner-country statistics degenerates sharply as one moves to more finely distinguished trade categories (lower-level SITCs). Equally disturbing, about one-quarter of the partner-country comparisons take the wrong sign. That is, one country's reported free-on-board (f.o.b.) exports exceed the reported cost-insurance-freight (c.i.f.) value of partners' imports. Aside from product composition, tests show that partner-country data are equally inaccurate for estimating the direction of trade. Why are partner-country data so unreliable for approximating missing data? Evidence shows: 1) problems in reporting or processing COMTRADE data; 2) valuation differences (f.o.b. versus c.i.f.) for imports and exports; 3) problems relating to entrepot trade, or exports originating in export processing zones; 4) problems associated with exchange-rate changes; 5) intentional or unintentional misclassification of products; 6) efforts to conceal trade data for proprietary reasons; and 7) financial incentives to purposely falsify trade data. The author concludes that efforts to improve the general quality, or availability, of trade statistics using partner-country data holds little or no promise, although this information may be useful in specific cases where the trade statistics of a certain country are known to incorporate major errors. Significant progress in ugrading the accuracy, and coverage, of trade statistics can be achieved only by improving each country's procedures for data collection.

Bilateral Trade --- Common Carriers Industry --- Country Strategy and Performance --- Customs --- Customs Union --- Developing Countries --- Development Economics and Aid Effectiveness --- Economic Theory and Research --- Emerging Markets --- Export Processing --- Export Processing Zones --- Export Value --- Exports --- Free Trade --- Free Trade Agreement --- Import Data --- Import Statistics --- Import Value --- Imports --- Industry --- International Economics --- International Economics & Trade --- International Trade --- International Trade Statistics --- Law and Development --- Macroeconomics and Economic Growth --- Private Sector Development --- Public Sector Development --- Science and Technology Development --- Statistical and Mathematical Sciences --- Tariffs --- Trade --- Trade Data --- Trade Law --- Trade Policy --- Transport --- Transport Economics, Policy and Planning