Physics – Physics and Society
Scientific paper
2011-01-24
PLoS ONE 6(7): e20814, 2011
Physics
Physics and Society
Scientific paper
10.1371/journal.pone.0020814
In this study we analyze one year of anonymized telecommunications data for over one million customers from a large European cellphone operator, and we investigate the relationship between people's calls and their physical location. We discover that more than 90% of users who have called each other have also shared the same space (cell tower), even if they live far apart. Moreover, we find that close to 70% of users who call each other frequently (at least once per month on average) have shared the same space at the same time - an instance that we call co-location. Co-locations appear indicative of coordination calls, which occur just before face-to-face meetings. Their number is highly predictable based on the amount of calls between two users and the distance between their home locations - suggesting a new way to quantify the interplay between telecommunications and face-to-face interactions.
Blondel Vincent D.
Calabrese Francesco
Ratti Carlo
Smoreda Zbigniew
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