Answered By: Bobray Bordelon Last Updated: Mar 31, 2017 Views: 48
Comtrade only contains data as submitted by reporter countries. If they have no trade in a particular commodity, then it will not appear as a zero entry in the database. If at least one country in the sample has imported that product, use the Stata command (fillin) to generate zero tradeflows for countries which did not import that product.
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