User:RobLa/MAF: Difference between revisions
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"majority approval filter" or "MAF" is an approval-based primary election method that advances all candidates who are approved by a majority of the electorate, as well as usually selecting an opposition candidate
== Definition ==
:'''''Draft 3''' published December 7, 2018''
This definition is written with some effort toward legal precision (thus the use of [http://lexicontools.com/defined_term.php capitalized defined terms])
=== Goal ===
=== Pools ===
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Revision as of 05:49, 8 December 2018
"majority approval filter" or "MAF" is an approval-based primary election method that advances all candidates who are approved by a majority of the electorate, as well as usually selecting an opposition candidate.
Definition
- Draft 3 published December 7, 2018
This definition is written with some effort toward legal precision (thus the use of capitalized defined terms)
Goal
A set of rules for holding a primary election with an Approval Voting-style ballot, providing motivation for all candidates to achieve the highest approval rating, and resulting in a general election Ballot Satisfaction Score of at least 75%. The "Ballot Satisfaction Score" is the percentage of the electorate which approves of at least one candidate on a given ballot.
Pools
Candidates advancing to the general election must qualify for one of the following "Pools". Candidates that don't qualify for one of the Pools below are "Non-advanced Candidates". By default, all candidates are Non-advanced Candidates until they qualify for one of these Pools:
- "Supermajority Candidate Pool" - all candidates who receive greater than 75% approval
- "Plurality Candidate Pool" - all candidates who receive greater than 50% approval, but do not qualify for the Supermajority Candidate Pool. If no candidate receives greater than 50% approval, this pool will contain one candidate with less than 50% approval.
- "Opposition Candidate Pool" - a subset of candidates who receive greater than 40% approval, but do not qualify for the Plurality Candidate Pool
Rules
Sequential steps for filling the above Pools with qualified candidates:
- Select the candidate who receives the highest approval rating. This is the "Top Candidate" and automatically qualifies for the general election ballot by one of the following rules:
- 1a. If the Top Candidate receives greater than 75% approval, add this candidate to the Supermajority Candidate Pool.
- 1b. If the Top Candidate receives less than 75% approval, add this candidate to the Plurality Candidate Pool.
- Complete the Supermajority Candidate Pool and the Plurality Candidate Pool using the following rules:
- 2a. Add any Non-advanced Candidates with greater than 75% approval to the Supermajority Candidate Pool
- 2b. Add any Non-advanced Candidates with less than 75% approval, but greater than 50% approval to the Plurality Candidate Pool
- Evaluate the Ballot Satisfaction Score (defined above) using the following rules:
- 3a. If the Ballot Satisfaction Score is greater than 75%, candidate selection is complete. Skip to step 5
- 3b. If the Ballot Satisfaction Score is less than 75%, proceed to step 4.
- If there is one or more candidates in the Plurality Candidate Pool, attempt to add an equal number qualified candidates to the Opposition Candidate Pool, evaluating each Non-advanced Candidate using the following steps
- 4a. Find the Non-advanced Candidate with the highest approval score.
- If this candidate has less than 40% approval, no further candidates qualify to be added to the Opposition Candidate Pool. Proceed to step 5.
- If this candidate has greater than 40% approval, add this candidate to the Opposition Candidate Pool, then proceed to step 4b.
- 4b. Compare the size of the Plurality Candidate Pool and the Opposition Candidate Pool
- If the Plurality Candidate Pool has more candidates than the Opposition Candidate Pool, skip back to step 3.
- If the Opposition Candidate Pool contains an equal number of candidates to the Plurality Candidate Pool, proceed to step 5.
- 4a. Find the Non-advanced Candidate with the highest approval score.
- Candidate selection is complete. Advance all candidates in the Supermajority Candidate Pool, the Plurality Candidate Pool, and the Opposition Candidate Pool to the general election.
History of MAF
- 2018-12-07 - Draft 3 published at https://electowiki.org/wiki/MAF. See December email thread "[EM] Approval-based replacement for jungle primary" for more discussion about the evolution of this draft
- 2018-11-22 - Draft 2 published in 2018-11-22 email from RobLa (and also avaiable at User:RobLa/MAF drafts#Draft_2
- 2018-11-20 - first draft published on electowiki.org and as "Replacing the jungle primary" by User:RobLa (and also available at User:RobLa/MAF drafts#Draft_1)
Full discussion history of this method can be found at Talk:Majority approval filter
See also
- Maximum approval top-two (MATT) - a simplification of MAF that is guaranteed to advance no more than two candidates.