Poissonian bursts in e-mail correspondence

Details Poissonian bursts in e-mail correspondence Poissonian bursts in e-mail correspondence

2009-07-07

arxiv.org/abs/0907.1263v1

Eur. Phys. Journal B (2010)

Physics

Physics and Society

Scientific paper

10.1140/epjb/e2010-00139-9

Recent work has shown that the distribution of inter-event times for e-mail communication exhibits a heavy tail which is statistically consistent with a cascading Poisson process. In this work we extend the analysis to higher-order statistics, using the Fano and Allan factors to quantify the extent to which the empirical data depart from the known correlations of Poissonian statistics. The analysis shows that the higher-order statistics from the empirical data is indistinguishable from that of randomly reordered time series, thus demonstrating that e-mail correspondence is no more bursty or correlated than a Poisson process. Furthermore synthetic data sets generated by a cascading Poisson process replicate the burstiness and correlations observed in the empirical data. Finally, a simple rescaling analysis using the best-estimate rate of activity, confirms that the empirically observed correlations arise from a non-homogeneus Poisson process.

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