Mathematics – Optimization and Control
Scientific paper
2010-01-18
European Journal of Operational Research 211 (2) (2011) 352-358
Mathematics
Optimization and Control
Scientific paper
10.1016/j.ejor.2010.11.027
The Banzhaf power index was introduced in cooperative game theory to measure the real power of players in a game. The Banzhaf interaction index was then proposed to measure the interaction degree inside coalitions of players. It was shown that the power and interaction indexes can be obtained as solutions of a standard least squares approximation problem for pseudo-Boolean functions. Considering certain weighted versions of this approximation problem, we define a class of weighted interaction indexes that generalize the Banzhaf interaction index. We show that these indexes define a subclass of the family of probabilistic interaction indexes and study their most important properties. Finally, we give an interpretation of the Banzhaf and Shapley interaction indexes as centers of mass of this subclass of interaction indexes.
Marichal Jean-Luc
Mathonet Pierre
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