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In their article "Slavery in Europe: Part 1, Estimating the Dark Figure", Monti Datta and Kevin Bales demonstrate the statistical techniques applied to the estimation of the dark figure of the prevalence of modern slavery across Europe. These same techniques are applied to a dataset that includes random sample surveys (where possible), secondary source estimates, a process of extrapolation, and a country level adjustment to determine the prevalence of people in modern slavery around the world in the Global Slavery Index.