Understanding individual human mobility patterns

I. Data 2 II. Characterizing individual calling activity 3 III. Observations at a fixed interevent time 4 IV. Intrinsic reference frame for individual trajectories 5 V. Scaling relation between exponents 9 VI. Time dependence of the radius of gyration 10 VII. Statistical tests of fitting distributions 11 A. Kolmogorov-Smirnov goodness of fit test 12 B. Maximum Likelihood Estimates: Comparing power-laws and exponentials 15 References 17 SUPPLEMENTARY INFORMATION doi: 10.1038/nature06958