Shapley-Shubik Power Index Calculator

The applet below is a calculator for the Shapley-Shubik Power Index. The instructions are built into the applet. The applet supplies six real world examples (Electoral College in the years 1990 and 2000, the UN Security Council, and the European Union in 1995, 2004, and 2007, with 15, 25, and 27 member countries, respectively) and provides means for entering custom distributions. The instructions for using the applet are available on a separate page and can also be read under the first tab directly in the applet.

This applet requires Sun's Java VM 2 which your browser may perceive as a popup. Which it is not. If you want to see the applet work, visit Sun's website at https://www.java.com/en/download/index.jsp, download and install Java VM and enjoy the applet.

What if applet does not run?

(This applet was created to accompany Excursions in Modern Mathematics, Seventh Edition, by Peter Tannenbaum © Pearson Education. Reproduced with permission. Two earlier versions of the applet are still available online at https://www.cut-the-knot.org/Curriculum/SocialScience/PowerIndex.shtml and https://www.cut-the-knot.org/Curriculum/SocialScience/PowerIndices.shtml. The older versions combine Banzhaf's and Shapley-Shubik indices in a single applet.)

The method of calculation of the Shapley-Shubik index is annunciated elsewhere.


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