File:Significance 868543 deviation from proportionality 1945-2010 max and min.PNG

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Significance_868543_deviation_from_proportionality_1945-2010_max_and_min.PNG

Significance_868543_deviation_from_proportionality_1945-2010_max_and_min.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 maximum, minimum, and (via a triangle) average deviation from proportionality for the period 1945-2010. The deviation from proportionality (DV) score is calculated by subtracting the seat share from the vote share for each party and adding up the differences (ignoring the -ve signs). The higher the score, the more unproportional the system. The lowest possible score is 0 (exactly proportional) and the highest possible score is 200 (exactly unproportional – a party with no votes gets all the seats). The average scores for the 4 systems since 1945 are:

  • FPTP: 29.4
  • AV: 27.3
  • STV: 12
  • PRO: 5.22

Coloration

  • 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:

 
FPTP
 
STV
 
PRO
 
AV
Date
Source Own work: Created by uploader on 11 April 2011 using Microsoft Paint and Microsoft Excel.
Author User:Anameofmyveryown
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current13:21, 12 April 2011Thumbnail for version as of 13:21, 12 April 2011982 × 604 (28 KB)Anameofmyveryown (talk | contribs){{Information|Description=Significance_868543_deviation_from_proportionality_1945-2010_max_and_min.PNG<br> ===Significance_868543_deviation_from_proportionality_1945-2010_max_and_min.PNG === The September 2010 edition of the magazine "[http://www.signifi

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