Defined term
Index of Disproportionality
Index of Disproportionality: A figure which is designed to measure the degree of deviation from proportionality in the allocation of seats to parties or…
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Election Administration
Definition
A figure which is designed to measure the degree of deviation from proportionality in the allocation of seats to parties or groupings which participated in the election. It is most commonly defined as the square root of the sum of the squares of the differences for each party or grouping between the percentage of votes received and the percentage of seats gained.
Sources
1
ACE Electoral Systems Glossary
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