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原文連結
論文資訊
- 類型：已發表論文
- 日期：2010
摘要
In the spirit of Lewis Richardson's original study of the statistics of deadly conflicts, we study the frequency and severity of terrorist attacks worldwide since 1968. We show that these events are uniformly characterized by the phenomenon of "scale invariance," that is, the frequency scales as an inverse power of the severity, P(x) proportional to x(-alpha). We find that this property is a robust feature of terrorism, persisting when we control for 經濟 development of the target country, the type of weapon used, and even for short time scales. Further, we show that the center of the distribution oscillates slightly with a period of roughly tau approximate to 13 years, that there exist significant temporal correlations in the frequency of severe events, and that current models of event inci
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