An analysis of data can reveal the patterns that lie below a perceived cloud of unpredictability. Six-months of anonymous cell phone activity from 100,000 users in a European country revealed that 75% of users traveled with a 20-mile area, with half of users mostly staying within a 6-mile radius. They also found that most users regularly travel between a small number of points (Candia, Gonzalez, Wang, Schoenharl, Madey, & Laszlo- Barabasi, 2008).
Candia, J., Gonzalez, M. C., Wang, P., Schoenharl, T., Madey, G., & Laszlo- Barabasi, A. (2008). Uncovering individual and collective human dynamics from mobile phone record. JOURNAL OF PHYSICS A: MATHEMATICAL AND THEORETICAL , 1-11.