The statistics in exhibits 20a and 20b of the U.S. International Trade in Goods and Services release are consistent with the statistics in ITA table 2.2 and ITA table 3.2, respectively.
The countries and areas shown in these two releases differ somewhat. The U.S. International Trade in Goods and Services release includes the following world areas that are not included in the ITAs: CAFTA-DR (Dominican Republic-Central America-United States Free Trade Agreement) and South/Central America. ITA tables 2.2 and 3.2 do not include these areas because trade with these areas currently is not reviewed for seasonality.
ITA tables 2.2 and 3.2 also show a total for exports and imports of goods/services, derived from the seasonally adjusted statistics by commodity and by service type, and a residual, calculated as the difference between the by-commodity/by-service type seasonally adjusted total and the sum of the individual countries and the “all other countries” aggregate. The seasonally adjusted country and world area data do not sum to the seasonally adjusted by-commodity/by-service type totals because the seasonally adjusted country and world area data and the by-commodity/by-service type totals are derived from different aggregations of the export and import data and from different seasonal adjustment models.