Proportional representation: Difference between revisions
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:<math>\mathrm{SLI} = \sum {(S-V)^2 \over V}</math>
The failing of all such measures is the assumption that each vote is cast for one political party. This means that the only system which can be used is a [[Partisan system]]. Under the assumption that a [[plurality vote]] for a candidate represents a vote for their party, these measures can be applied to plurality voting systems like [[Single Member Plurality]] and [[Mixed Member Proportional]]. The consequence of this limitation is that Proportional Representation is not defined for systems without [[vote splitting]]. [[PSC]] is the most direct generalization.
It is worth noting that because there are disagreements on how best to conceptualize of PR, some measures look at how much each voter likes their favorite candidate i.e. the one meant to "represent them" (such as [[Monroe's method]]) while others look at how satisfied each voter is with all of the elected representatives.
== Proportional Representation Criteria==
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