Just in the first 3 paragraphs of the article: > ...An analysis of multiple sources of aggregated smartphone location data has found. You need a smartphone an

Just in the first 3 paragraphs of the article: > ...An analysis of multiple sources of aggregated smartphone location data has found. You need a smartphone and apps/settings that enable aggregation of location data. This is not something that is going to be evenly distributed throughout the city. Further, that is likely to be primarily advertising data, so quality is less than you would desire. How many people are going to be counted twice when you merge this data together? > Roughly 5 percent of residents — or about 420,000 people — left the city between March 1 and May 1. That's not a lot of people for NYC. > Some of these areas are typically home to lots of students, many of whom left as colleges and universities closed There are nearly 600,000 college students in NYC[1]. That's more than the number of people that left! [1] https://en.wikipedia.org/wiki/Education_in_New_York_City https://en.wikipedia.org/wiki/Education_in_New_York_City