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After 9/11

Author

Listed:
  • Walter Enders

    (Department of Economics, Finance, and Legal Studies, University of Alabama)

  • Todd Sandler

    (School of International Relations, University of Southern California)

Abstract

Using time-series procedures, the authors investigate whether transnational terrorism changed following 9/11 and the subsequent U.S.-led “war on terror.†Perhaps surprising, little has changed in the time series of overall incidents and most of its component series. When 9/11 is prejudged as a break date, the authors find that logistically complex hostage-taking events have fallen as a proportion of all events, while logistically simple, but deadly, bombings have increased as a proportion of deadly incidents. These results hold when they apply the Bai-Perron procedure in which structural breaks are data identified. This procedure locates earlier breaks in the mid-1970s and 1990s. Reasonable out-of-sample forecasts are possible if structural breaks are incorporated fairly rapidly into the model.

Suggested Citation

  • Walter Enders & Todd Sandler, 2005. "After 9/11," Journal of Conflict Resolution, Peace Science Society (International), vol. 49(2), pages 259-277, April.
    • Handle: RePEc:sae:jocore:v:49:y:2005:i:2:p:259-277
    DOI: 10.1177/0022002704272864
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    References listed on IDEAS

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    1. Jushan Bai & Pierre Perron, 1998. "Estimating and Testing Linear Models with Multiple Structural Changes," Econometrica, Econometric Society, vol. 66(1), pages 47-78, January.
    2. Enders, Walter & Sandler, Todd, 2000. "Is Transnational Terrorism Becoming More Threatening? A Time-Series Investigation," Staff General Research Papers Archive 1823, Iowa State University, Department of Economics.
    3. Todd Sandler, 2003. "Collective Action and Transnational Terrorism," The World Economy, Wiley Blackwell, vol. 26(6), pages 779-802, June.
    4. Walter Enders & Todd Sandler, 2000. "Is Transnational Terrorism Becoming More Threatening?," Journal of Conflict Resolution, Peace Science Society (International), vol. 44(3), pages 307-332, June.
    5. Sandler, Todd & Tschirhart, John T. & Cauley, Jon, 1983. "A Theoretical Analysis of Transnational Terrorism," American Political Science Review, Cambridge University Press, vol. 77(1), pages 36-54, March.
    6. Perron, Pierre, 1989. "The Great Crash, the Oil Price Shock, and the Unit Root Hypothesis," Econometrica, Econometric Society, vol. 57(6), pages 1361-1401, November.
    7. Sandler, Todd & Enders, Walter, 2004. "An economic perspective on transnational terrorism," European Journal of Political Economy, Elsevier, vol. 20(2), pages 301-316, June.
    8. Jushan Bai & Pierre Perron, 2003. "Computation and analysis of multiple structural change models," Journal of Applied Econometrics, John Wiley & Sons, Ltd., vol. 18(1), pages 1-22.
    9. Enders, Walter & Sandler, Todd, 1993. "The Effectiveness of Antiterrorism Policies: A Vector-Autoregression-Intervention Analysis," American Political Science Review, Cambridge University Press, vol. 87(4), pages 829-844, December.
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    Cited by:

    1. Heidi Kaila & Saurabh Singhal & Divya Tuteja, 2017. "Do fences make good neighbours? Evidence from an insurgency in India," WIDER Working Paper Series 158, World Institute for Development Economic Research (UNU-WIDER).

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