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The Product Space uses international trade data from Feenstra, Lipset, Deng, Ma, and Mo's ''World Trade Flows: 1962-2000'' dataset,<ref>R.R. Feenstra, H.D. Lipsey, A. Ma, H. Mo, ''HBER Work. Pap 11040'' (2005).</ref> cleaned and made compatible through a [[National Bureau of Economic Research]] (NBER) project. The dataset contains exports and imports both by country of origin and by destination. Products are disaggregated according to the Standardized International Trade Code at the four-digit level (SITC-4). Focusing on data from 1998-2000 yields 775 product classes and provides for each country the value exported to all other countries for each class. From this, a 775-by-775 matrix of proximities between every pair of products is created.[[File:ProductSpaceMatrices.png|thumb|right|upright=2|'''A.''' The Product Space matrix sorted by SITC4 classification. '''B.''' The Product Space hierarchically sorted reveals modularity and that 775 products are actively traded.]]
The Product Space uses international trade data from Feenstra, Lipset, Deng, Ma, and Mo's ''World Trade Flows: 1962-2000'' dataset,<ref>R.R. Feenstra, H.D. Lipsey, A. Ma, H. Mo, ''HBER Work. Pap 11040'' (2005).</ref> cleaned and made compatible through a [[National Bureau of Economic Research]] (NBER) project. The dataset contains exports and imports both by country of origin and by destination. Products are disaggregated according to the Standardized International Trade Code at the four-digit level (SITC-4). Focusing on data from 1998-2000 yields 775 product classes and provides for each country the value exported to all other countries for each class. From this, a 775-by-775 matrix of proximities between every pair of products is created.[[File:ProductSpaceMatrices.png|thumb|right|upright=2|'''A.''' The Product Space matrix sorted by SITC4 classification. '''B.''' The Product Space hierarchically sorted reveals modularity and that 775 products are actively traded. A.按 SITC4分类排序的乘积空间矩阵。B.产品空间按层次分类揭示了模块性，775种产品被积极交易。]]
The Product Space uses international trade data from Feenstra, Lipset, Deng, Ma, and Mo's World Trade Flows: 1962-2000 dataset, cleaned and made compatible through a National Bureau of Economic Research (NBER) project. The dataset contains exports and imports both by country of origin and by destination. Products are disaggregated according to the Standardized International Trade Code at the four-digit level (SITC-4). Focusing on data from 1998-2000 yields 775 product classes and provides for each country the value exported to all other countries for each class. From this, a 775-by-775 matrix of proximities between every pair of products is created.A. The Product Space matrix sorted by SITC4 classification. B. The Product Space hierarchically sorted reveals modularity and that 775 products are actively traded.
The Product Space uses international trade data from Feenstra, Lipset, Deng, Ma, and Mo's World Trade Flows: 1962-2000 dataset, cleaned and made compatible through a National Bureau of Economic Research (NBER) project. The dataset contains exports and imports both by country of origin and by destination. Products are disaggregated according to the Standardized International Trade Code at the four-digit level (SITC-4). Focusing on data from 1998-2000 yields 775 product classes and provides for each country the value exported to all other countries for each class. From this, a 775-by-775 matrix of proximities between every pair of products is created.A. The Product Space matrix sorted by SITC4 classification. B. The Product Space hierarchically sorted reveals modularity and that 775 products are actively traded.