Role of Activity in Human Dynamics

Details Role of Activity in Human Dynamics Role of Activity in Human Dynamics

2007-11-27

arxiv.org/abs/0711.4168v3

EPL 82 (2008) 28002

Physics

Physics and Society

5 pages, 6 figures. Accepted by EPL

Scientific paper

10.1209/0295-5075/82/28002

The human society is a very complex system; still, there are several non-trivial, general features. One type of them is the presence of power-law distributed quantities in temporal statistics. In this Letter, we focus on the origin of power-laws in rating of movies. We present a systematic empirical exploration of the time between two consecutive ratings of movies (the interevent time). At an aggregate level, we find a monotonous relation between the activity of individuals and the power-law exponent of the interevent-time distribution. At an individual level, we observe a heavy-tailed distribution for each user, as well as a negative correlation between the activity and the width of the distribution. We support these findings by a similar data set from mobile phone text-message communication. Our results demonstrate a significant role of the activity of individuals on the society-level patterns of human behavior. We believe this is a common character in the interest-driven human dynamics, corresponding to (but different from) the universality classes of task-driven dynamics.

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