A Poisson model of incidents of international terrorism in the United States

Abstract

Various haphazard, and often uncoordinated, efforts have been devoted to discouraging and combatting terrorism. Unfortunately, there has been a noticeable lack of quantitative studies of the problem of terrorism. Nevertheless, it can be expected that the problem of international terrorism will eventually be a focus for operations researchers. A factor fundamental to any OR study is an understanding of the underlying generating process for incidents of terrorism. Based on incidents of terrorism from 1968 to 1974, this paper notes that the Poisson is a good model for the occurrence of incidents of international terrorism in the United States. Results of both chi‐square and Kolmogorov‐Smirnov tests are presented. Finally, an unusual result, inconsistent with popular beliefs, is noted.     

Reviews

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An analysis of offer functions of banks and credit unions in Guatemala

Economists have sought to identify institutions which might fill the gap in household access to credit arising from rationing by formal lenders. Credit unions have been identified as institutions which might use informational and monitoring advantages to fill that gap. Using information on household perceptions of their access to credit, this article analyses the impact of certain credit unions on the access to credit of households in Guatemala. Regression results indicate that credit unions serve markets unserved by formal lenders and that information on household perceptions of their access to credit is important in making inferences about lender lending activities.     

5.5 Transportation

Since the early 1990s, reports on topics ranging from neighbourhood renewal and low demand to social exclusion have highlighted the damaging effects of anti-social behaviour. Local authorities are urged to develop a 'holistic' response to anti-social behaviour. Recent research into the effectiveness of legal remedies reveals a tension between attempts to address the underlying causes of anti-social behaviour and the government's emphasis on legal action to control and punish perpetrators. Drawing on this research, the article examines why many landlords are still evicting perpetrators rather than dealing with the underlying causes of their behaviour. The article concludes by outlining the barriers that landlords and other agencies must overcome in order to develop a holistic approach to the problem.     

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