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Deviation from proportionality

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Title: Deviation from proportionality  
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Subject: Plurality voting system, First-past-the-post voting
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Deviation from proportionality

The main function of deviation from proportionality is to denote the proportion of malapointment in a democratic process. The idea is basically a mathematical relationship between the percentage of votes obtained by a political party and the percentage of parliamentary seats allocated to it.

To calculate just subtract a parties’ vote share from their seat share, add up all of the absolute values (that is, ignoring any negative signs), and finally divide by two.[1]


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