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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. Voters use an [[W:approval voting|approval voting]] ballot to select which candidates would be acceptable to advance to the general election. If most voters engage in [[W:Bullet voting|bullet voting]], it would ''typically'' select two candidates to advance to a general election.
== RulesDefinition ==
:'' '''Draft 3''' published December 7, 2018'' ▼=== Draft 3 ===
▲:''published December 7, 2018''
:Goal:
:<blockquote>Hold 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.</blockquote>
:#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.
<br />
See December email thread "[http://lists.electorama.com/pipermail/election-methods-electorama.com/2018-December/thread.html <nowiki>[EM] Approval-based replacement for jungle primary</nowiki>]" for more discussion about the evolution of this draft.
=== Draft 2 ===
:''published November 22, 2018''
Rules for Draft 2:
# Select the candidate who receives the highest approval rating. This is the "top candidate" and qualifies for the ballot
#* 1a. If the top candidate (and any other candidate) receives greater than 75% approval, add these candidates to the "highly-approved candidate pool"
#* 1b. If the top candidate receives less than 75% approval, add the top candidate to the "majority candidate pool"
# If the top candidate has been added to the "majority candidate pool", also add a candidate to the “opposition candidate pool”. To be added, this candidate must be the candidate which maximizes the "majority/opposition ballot satisfaction". "ballot satisfaction" generally means voters approve of at least one candidate on a given ballot. "majority/opposition ballot satisfaction" is for a ballot that only contains the "majority candidate pool" and the "opposition candidate pool".
# For each candidate who receives over 50% approval, but less than 75% approval:
#* 3a. Add this candidate to the "majority candidate pool"
#* 3b. Add a candidate to the "opposition candidate pool" who maximizes the "majority/opposition ballot satisfaction" of the electorate (as in step 2)
# Eliminate all candidates from the "opposition candidate pool" who have an overall approval rating under 25%
# All candidates remaining in the "highly-approved candidate pool", the "majority candidate pool" and the "opposition candidate pool" advance to the general election.
See [http://lists.electorama.com/pipermail/election-methods-electorama.com/2018-November/001925.html 2018-11-22 email from RobLa] for further commentary. ▼
=== Draft 1 ===
:''published November 20, 2018''
Rules for Draft 1:
# The candidate who receives the highest approval rating (the "front-runner") qualifies for the general election
#* Example: if there are 100 voters, and 40 approve of "A" and "B", 30 approve of only "B", and 30 approve of only "C", then
#** "B" advances to the general election, since "B" is approved by 70% of voters.
# A second candidate (the "complementary candidate"), who maximizes the approval of the electorate, also qualifies (i.e. by having the highest approval among voters that did ''not'' approve of the front-runner). If two candidates both satisfy an equal part of the remaining electorate, the candidate with the highest overall approval rating advances.
#* Example: if there are 100 voters, and 40 approve of both "A" and "B", 30 approve of only "B", and 30 approve of only "C", then
#** "B" advances with 70% approval (per step 1)
#** "C" advances (per this step). "B" satisfies 70% of the electorate, and "C" satisfies the other 30%. So, 100% of the voters will be satisfied with one of their choices in the general election.
# All candidates who receive over 50% approval ("majority approval candidates") ''also'' qualify for the general election
#* Example: if there are 100 voters, and 50 approve of "A" and "B", 20 approve of only "B", and 30 approve of only "C", then :
#** "B" advances with 70% approval (per step 1)
#** "C" advances, satisfying the other 30% of the electorate, making the total 100% (step 2)
#** "A" advances as well (having achieved 50% approval)
== History of MAF ==
* 2018-1112-2007 - firstDraft draft3 published onat https://electowiki.org/wiki/MAF. See December andemail asthread "[httpshttp://mediumlists.electorama.com/@roblapipermail/replacingelection-themethods-jungleelectorama.com/2018-primaryDecember/thread.html <nowiki>[EM] Approval-c1e844a5333bbased Replacingreplacement thefor jungle primary</nowiki>]" for bymore [[User:RobLa]]discussion about the evolution of this draft
▲See*2018-11-22 - Draft 2 published in [http://lists.electorama.com/pipermail/election-methods-electorama.com/2018-November/001925.html 2018-11-22 email from RobLa] for(and furtheralso commentary.avaiable at [[User:RobLa/MAF drafts#Draft_2]]
*2018-11-20 - first draft published on electowiki.org and as "[https://medium.com/@robla/replacing-the-jungle-primary-c1e844a5333b 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]]
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