Computing power indices in weighted majority games

Abstract

Power indices methodology of weighted majority game is widely used to measure a priori voting power of members of a committee. In this paper we present a computer implementation of the main power indices: Shapley-Shubik, Banzhaf, Johnston, Deegan-Packel and the Holler- Packel power indices. This computer implementation allows comparing the different indices. The system was developed for multiplataform: Linux and Windows. We compute the power indices for two examples and analyze its results.