Journal
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
Volume 362, Issue 2, Pages 480-484Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physa.2005.08.030
Keywords
terrorism; Allan factor; scaling; correlation; time-clustering
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Is there any kind of memory in the sequence of terror attacks worldwide? Are the terrorist attacks non-randomly time distributed? Our analysis suggests that they are correlated, which means that a terror event is not independent from the time elapsed since the previous event. But, if we consider terror attacks with a large severity index (number of fatalities or injured), the phenomenon is unpredictable, since it approaches a Poisson process (random, independent and uncorrelated). (c) 2005 Elsevier B.V. All rights reserved.
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