Bloc voting: Difference between revisions
no edit summary
m (Mentioned that Bloc methods can often be made semi-proportional, and that Bloc Condorcet Voting exists.) |
No edit summary |
||
Line 1:
{{Wikipedia|Plurality-at-large voting}}
'''Bloc voting''' (or ''block voting'') (also called at-large voting, in reference to Plurality-at-large) refers to a class of [[Multi-Member System]] which can be used to elect several representatives from a single [[constituency]].
Common examples:
Line 9:
* '''Bloc Score Voting''': Each voter scores all the candidates on a scale with three or more units. Starting the scale at zero is preferable. Add all the scores. Elect the candidates with the highest total score until all positions are filled.
* '''Bloc STAR Voting''': Each voter scores all the candidates on a scale from 0-5. All the scores are added and the two highest scoring candidates advance to an automatic runoff. The finalist who was preferred by (scored higher by) more voters wins the first seat. The next two highest scoring candidates then runoff, with the finalist preferred by more voters winning the next seat. This process continues until all positions are filled.
*'''[[Cumulative voting |
*'''[[Single non-transferable vote]]''': Each voter casts one vote for one candidate in a multi-candidate race for multiple offices. Note that this is very different from most bloc voting methods in that it passes a weak form of [[PSC]].
In Bloc
The bloc voting system has a number of features which can make it unrepresentative of the voters' intentions. It regularly produces complete landslide majorities for the group of candidates with the highest level of support, though this does tend to lead to greater agreement among those elected. Like first past the post methods, small cohesive groups of voters can overpower larger numbers of disorganised voters who do not engage in [[tactical voting]].
Line 20:
'''Partial block voting''' (or Limited-voting) involves each voter receiving fewer votes than the number of candidates to be elected. This can enable reasonably sized minorities to achieve some representation. It is used for elections in Gibraltar, where each voter has 8 votes, and 15 seats are open for election: the usual result is that the most popular party wins 8 seats and forms the Gibraltar administration, while the second most popular wins 7 seats and forms the opposition. If each voter only receives one vote then ''partial bloc voting'' reduces to a [[single non-transferable vote]].
In '''preferential bloc voting''', which is the bloc form of [[IRV]], each voter ranks the candidates (i.e. places the numbers 1... x on the ballot paper (where "x" is the number of candidates on the ballot paper)). Candidates with the smallest tally of first preference votes are eliminated (and their votes transferred) until a candidate has more than half the vote. The system is re-started ''n'' times with the elected candidates removed and all votes returning to full value.
It is possible to do '''Bloc Condorcet Voting''' with any prespecified [[Condorcet method]]. For example, Bloc [[Schulze|Schulze voting]] would elect the top ''n'' candidates as ranked by Schulze. ▼
It is generally possible to make a majoritarian or utilitarian Bloc voting method at least semi-proportional by sequentially 1) electing the best candidate according to the Bloc method and 2) reweighting the ballots that supported that candidate somehow.▼
In general, Bloc methods can be summarized as electing the top ''n'' [[Ranking|ranked]] candidates of some single-winner voting method.
▲It is possible to do '''Bloc Condorcet Voting''' with any prespecified Condorcet method.
----
Line 30:
'''Block voting''' also describes a system of ''winner takes all'' decision-taking whereby the vote of an entire electoral unit is cast in line with the majority decision of that unit (i.e. discounting any contrary votes). This is the system used by most States for the [[U.S. Electoral College]]. It is also used in the UK by the [[Trades Union Congress]]; in a irony of history, it was introduced in 1895 by supporters of the Liberal Party to prevent or delay the establishment of the Labour Party, and it took the Labour Party from 1900 until 1993 to remove it from its own structures.
== Notes ==
▲It is generally possible to make a majoritarian or utilitarian Bloc voting method at least semi-proportional by sequentially 1) electing the best candidate according to the Bloc method and 2)
{{fromwikipedia}}
| |||