Referendum Options Simulator

From the Centre for Mathematical Social Science blog:

New Zealanders will vote in a referendum in November asking whether they want to change the current voting system used for deciding the makeup of Parliament.

Dr Geoffrey Pritchard and Dr Mark C. Wilson, members of the Centre for Mathematical Social Science at the University of Auckland, have created a simulator intended to voters to compare the 5 proposed electoral systems in a quantitative way, by allowing them to compute quickly, for a given polling scenario, the party seat distribution in Parliament under each system. It is written in Javascript and the source code is publicly available. The assumptions made are detailed in the FAQ.

Try the simulator now!

Some of their assumptions around Maori seats are questionable, but still a useful tool.