Heterogenous human dynamics in intra- and inter-day time scales
Department of Modern Physics, University of Science and Technology of China - Hefei 230026, China
2 Department of Physics, University of Fribourg - Fribourg, Switzerland
3 The Research Center for Complex System Science, University of Shanghai for Science and Technology and Shanghai Academy of System Science - Shanghai, 200093 China
Accepted: 7 March 2011
In this paper, we study two large data sets containing the information of two different human behaviors: blog-posting and wiki-revising. In both cases, the interevent time distributions decay as power laws at both individual and population level. Unlike previous studies, we put emphasis on time scales and obtain heterogeneous decay exponents in the intra- and inter-day range for the same dataset. Moreover, we observe opposite trend of exponents in relation to individual Activity. Further investigations show that the presence of intra-day activities mask the correlation between consecutive inter-day activities and lead to an underestimate of Memory, which explain the contradicting results in recent empirical studies. Removal of data in intra-day range reveals the high values of Memory and lead us to convergent results between wiki-revising and blog-posting.
PACS: 89.75.-k – Complex systems / 05.45.Tp – Time series analysis
© EPLA, 2011