Can instant-runoff violate the Condorcet fairness criteria?
Instant-runoff voting It does not comply with the Condorcet criterion. Consider, for example, the following vote count of preferences with three candidates {A, B, C}: A > B > C: 35.
What does STV stand for?
STV
| Acronym | Definition |
|---|---|
| STV | Single Transferable Vote |
| STV | Scottish Television |
| STV | Satellite Television |
| STV | Special Tariff Voucher (India) |
Does Instant-Runoff satisfy majority criterion?
The criterion states that “if one candidate is ranked first by a majority (more than 50\%) of voters, then that candidate must win”. Some methods that comply with this criterion include any Condorcet method, Instant-runoff voting, Bucklin voting, and Plurality voting.
How do you tell if there is a Condorcet winner?
The number of votes for runner over opponent (runner, opponent) is compared with the number of votes for opponent over runner (opponent, runner) to find the Condorcet winner. In the sum matrix above, A is the Condorcet winner because A beats every other candidate.
What is a “runoff election”?
This is similar to the idea of holding runoff elections, but since every voter’s order of preference is recorded on the ballot, the runoff can be computed without requiring a second costly election.
What is Irv (alternative vote)?
IRV is also sometimes referred to as the alternative vote, preferential voting, or ranked-choice voting (RCV), though these names are also used for other systems.
What happens to the candidate with the fewest number of votes?
If not, then the candidate with the fewest votes is eliminated. The voters who selected the defeated candidate as a first choice then have their votes added to the totals of their next choice. This process continues until a candidate has more than half of the votes.
What happens when a voter has no preference?
When a voter has no preference, or decides themselves that their ability to form a correct preference is insufficient, the correct vote is no vote. This is expressed by equal rankings, and when all rankings are equal it is expressed by no vote.