A new approximation method for the Shapley value applied to the WTC 9/11 terrorist attack
van Campen,Tjeerd Hamers,Herbert Husslage,Bart Lindelauf,Roy
van Campen,Tjeerd
Hamers,Herbert
Husslage,Bart
Lindelauf,Roy
Abstract
The Shapley value (Shapley in Ann Math Stud 2:28, 1953) is one of the most prominent one-point solution concepts in cooperative game theory that divides revenues (or cost, power) that can be obtained by cooperation of players in the game. The Shapley value is mathematically characterized by properties that have appealing real-world interpretations and hence its use in practical settings is easily justified. The down part is that its computational complexity increases exponentially with the number of players in the game. Therefore, in practical problems that consist of more than 25 players the calculation of the Shapley value is usually too time expensive. Among others the Shapley value is applied in the analysis of terrorist networks (cf.Lindelauf et al. in Eur J Oper Res 229(1):230-238, 2013) which generally extend beyond the size of 25 players. In this paper we therefore present a new method to approximate the Shapley value by refining the random sampling method introduced by Castro et al. (Comput Oper Res 36(5):1726-1730, 2009). We show that our method outperforms the random sampling method, reducing the average error in the Shapley value approximation by almost 30%. Moreover, our new method enables us to analyze the extended WTC 9/11 network of Krebs (Connections 24(3):43-52, 2002) that consists of 69 members. This in contrast to the restricted WTC 9/11 network considered in Lindelauf et al. (2013), that only considered the operational cells consisting of the 19 hijackers that conducted the attack.
Description
Date
2018-12
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Publisher
Research Projects
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Keywords
Approximation method, Shapley value, Cooperative game theory, GAMES, CENTRALITY, NETWORKS, POWER, SDG 16 - Peace, Justice and Strong Institutions
Citation
van Campen, T, Hamers, H, Husslage, B & Lindelauf, R 2018, 'A new approximation method for the Shapley value applied to the WTC 9/11 terrorist attack', Social Network Analysis and Mining, vol. 8, no. 1, 3. https://doi.org/10.1007/s13278-017-0480-z