Significance_868543_churn_1945-2010_average.PNG

The September 2010 edition of the magazine "Significance" (a magazine published by both the Royal Statistical Society and the American Statistical Association) published an article entitled "Keeping things in proportion: how can voting systems be fairer?".

That article compared the UK, Australia, Ireland and the Netherlands Houses of the People (the legislative house containing representatives elected by individuals, sometimes called "House of Representatives", "House of Commons", or simply "Parliament") since 1945. Each of those houses use different voting systems: UK uses First Past the Post (FPTP), Australia uses Instant-Runoff voting (AV), Ireland uses Single Transferable Vote (STV), the Netherlands uses Open-list Proportional Representation (PRO).

The article published conclusions in the form of various figures and graphs. I took those figures and displayed them graphically, and I took those graphs, equivalised the axes, and displayed them on new graphs on equivalised axes. The resultant graphs satisfy the definition of an original work (not being a cut-and-paste and not being a copy) but do not violate the requirements of WP:OR nor WP:SYN, since they do not present nor synthesise a conclusion not present in the original article. They can therefore be used freely on the various Wikipedias.

This is one of those resultant graphs.

It displays the average churn for the period 1945-2010. The churn score is the percentage of seats that change hands. The average scores for the 4 systems since 1945 are:

• FPTP: 17.3
• STV: 17.4
• AV: 19
• PRO: 21

• In order to allow the chart to be used on all wikis, the chart has minimal annotations in English.
• The chart is coloured to the following schema: