Clarification of Frontex Data On Persons Detected at EU External Borders – Includes Significant Double Counting

I really think we should be more careful with data

MIGRANTS AT SEA

Yesterday Frontex released updated monthly data showing that 710,000 migrants crossed the EU’s external borders from January to September 2015. In a Twitter exchange with Nando Sigona (Univ. of Birmingham and Univ. of Oxford), Frontex clarified that it counts an individual migrant each time she crosses an external border; according to Frontex, “[t]his means that a large number of the [710,000] people who were counted when they arrived in Greece were again counted when [after passing through Greece, they entered] the EU for the second time through Hungary or Croatia.”

The 710,000 figure that was widely reported yesterday may overstate the number of individuals crossing the external borders by several hundred thousand. For example, Frontex reported that 350,000 migrants arrived in the Greek islands during the first nine months of 2015 and that 204,000 migrants crossed into Hungary during the same time period. Presumably a majority (or at least…

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