After 9/11

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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.

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