Figure 7
From: Measuring and mitigating behavioural segregation using Call Detail Records
Observed relationship between the amount of communications originated in each district of Istanbul and the population living in the district. We confirm a linear relationship as expected. Using this relationship to make an estimate indicates that there are about 565,000 refugees living in Istanbul. This is above the 400,000 number cited by public authorities. On the other hand, using the relationship to estimate the local population of the city returns a figure of 10,000,000 people, below the official count of 13,500,000