Analyse spatiale du pouvoir de vote : application au cas de l'intercommunalité dans le département du Val d'Oise

The spatial analysis of power indices is commonly used in the literature to study the importance of ideological criteria. Our purpose is to show, through the example of some french groupings of local cities, the importance of the geographical situation of the players when considering power analysis. We show that the classical measure of power (with the Shapley-Shubik index of power) may be sometimes radically different if the geographical aspect of the player is taken into account (with the Shapley-Owen index of power).