Single transferable vote: Difference between revisions
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STV is a [[Largest remainder method|largest remainder method]] in the [[Party list case|party list case]]. This is because it gives each party as many seats as they have quotas, and when nobody can reach the quota anymore, it eliminates candidates until there are only as many candidates left as seats that are still unfilled, which de facto means that the parties with the most votes remaining (i.e. largest remainders) will win, since they'll be last to be eliminated.
STV and IRV can be visualized using Sankey or flow diagrams. If, in a given round, a candidate reaches the quota (a majority in IRV), they win, and if more seats are to be filled, then a quota of their votes are spent. This could be visualized by arranging the candidates from most votes to fewest in each round, and then showing a threshold for how many votes the candidate with the most votes in that round needs to win, or even further, showing the quota needed for the top (number of seats to be filled) candidates to win. Here is one example: https://www.reddit.com/r/dataisbeautiful/comments/8we8ep/sankey_diagram_of_results_from_maines_democratic/
STV passes [[PSC]] regardless of the method used to decide which candidate is to be eliminated next. It passes the [[Droop proportionality criterion]] when the [[Droop quota]] is used, making it one of the few commonly discussed PR methods that guarantees that a majority will always win at least half of the seats.
STV has several variations that can be discussed. For example, Meek and Warren STV are variants of STV that attempt to make the process fairer, but at the cost of needing to be computerized to compute the result.
=== Related Election Methods ===
*[[SNTV|Single Non-Transferable Vote]]
* [[CPO-STV]]
*[[Schulze STV]] can be thought of as a way to make STV a [[Condorcet PR]] method and reduce to [[D'Hondt]] in its [[party list case]] rather than a [[largest remainder method]]
== External links ==
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