Wasted votes: Difference between revisions
Fix typo, add section about multiwinner weighted methods
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The concept of a wasted vote is related to [[Vote splitting]] and other similar
== Calculating the number of wasted votes in a FPTP election ==
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Note that for methods that allow voters to omit preferences between candidates, calculating this metric exactly (footnote 2) requires knowing not just all of the votes used in the election to calculate, but also the preferences of all of the voters casting those votes. This means that this metric is no-longer defined by just the raw votes, as under such methods, multiple elections in which the exact same votes are cast can have different numbers of wasted votes depending on the voters casting those votes.
== Wasted votes in weighted-vote multi-winner systems ==
Some voting systems, like Chamberlin-Courant and [[Evaluative Proportional Representation]], return an assembly (i.e. multiple winners) with each winner having a weight. Each winner has a weighted vote in decisions made by the assembly - a generalization of having an integer number of seats. If each voter's ballot influences the weights of the winners to some slight degree, then it can be argued that no vote is wasted because all of them have an effect on the outcome.
However, such changes need not alter the outcomes of the assembly's votes. For instance, if changing a ballot changes the weights in a two-winner assembly from (0.49, 0.51) to (0.48, 0.52), and the assembly uses majority rule, the second winner can force the outcome in both cases.
== Footnotes ==
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