User:Pathoschild/2007 single transferable voting for board elections
Single Transferable Voting is an electoral system in which voters list candidates in order of preference. This page examines an electoral method for the 2008 board elections based on this system.
In the derived system, voters rank as many candidates as they'd like. If one preferred candidate loses, their vote is transferred to their next favourite candidate. This eliminates the need for strategic voting, and ensures that votes for less-popular candidate aren't "wasted" but instead increase the chances that second-favourite candidates win. Winners can be calculated in one of two ways:
- the Schulze method;
- by systematically eliminating the weakest candidates in each calculation round.
In an example election, there are 1000 voters electing six candidates to three positions. They are presented with a form like this:
The form script will ask the user to correct the input if there are non-numerical values; any numerical values will be ordered, so that "-50 0 300 1000" become "1 2 3 4".
After the election, a computer program counts the votes. The votes cast are distributed like this:
|Candidate||Vote count by preference|
Vote counting (systematic elimination method)
In a series of steps, the computer program will systematically eliminate the weakest candidates and transfer votes until there are only three winning candidates remaining (assuming there are three positions to be filled).
- GenericName32 has the fewest #1 votes, so he is automatically eliminated. All remaining votes are transferred.
- Jacques Example has the fewest #1 votes and transferred votes, so he is eliminated.
- Mary Hill has the fewest #1 votes and transferred votes, so she is eliminated.
- John Doe, Billy User, and Jane Apple win.
- Can I change my votes after casting them?
- Yes; simply casting a new ballot will replace the old one.
- What if I don't prefer one candidate over another?
- You can vote equally for candidates by using the same number; for example, "1, 2, 2, 3".
- What if a candidate withdraws?
- All votes for that candidate will be ignored, so the program will skip to the next favourite candidate on your list.