TL;DR– When everything is even what system you use to tabulate the votes will have a marked change on the outcome.
Throughout the year in my other job I have been teaching classes on Political Science, specifically Australian Political Institutions. On the week where we discussed voting systems one of the things that we mention is that how you chose to formulate your electoral systems can have dramatic impacts on the outcome of elections i.e. who gets what seats in parliament. However, while this was clear I didn’t have a good example to show. Well, I had some free time at the end of the year and this question had been bugging me so I decided to work through the data myself to see if there was such a big difference and it does, boy does it ever. Now, for those who are not familiar with Australian Politics, we have presented a little primer next, as well as a general overview of the project, but if you are familiar you can skip down to the data below.