Proportionality for Solid Coalitions

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This is an election methods criteria relating to proportional representation systems. The criteria was invented by Dummett [1].

Tideman [2] defines the criteria as

This is the property that if there is a set of voters, V, who rank all candidates in some set, S, ahead of all other candidates, then the number of candidates in S who are elected will be at least as great as the proportion of the electorate who are in V multiplied by the number of candidates to be elected, rounded down to an integer (provided that S contains at least that many candidates).

Tideman [3] calls the equivalent criteria, but based on the Droop quota (k+1)-proportionality for solid coalitions.

[edit] References

  1. ^ Dummett, M., Voting procedures. Oxford Clarendon Press (1984)
  2. ^ Tideman, N. and Richardson, D., Better Voting Methods Through Technology: The Refinement-Manageability Trade-Off in the Single Transferable Vote, Volume 103, Numbers 1-2 / April, 2000
  3. ^ Tideman N., Collective Decisions and Voting, Ashgate Publishing Ltd, Aldershot, 2006
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