Plurality with elimination, Runoff method, Condorcet criterion

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Presentation transcript:

Plurality with elimination, Runoff method, Condorcet criterion

Plurality with Elimination Each voter votes for one candidate. A candidate that receiving the majority of the votes is declared the winner. If no candidate receives a majority of the votes, then the candidate/candidates with the fewest votes is dropped from the ballot and a new election is held. You follow this process until a candidate receives a majority of votes.

Example 6 7 5 3 9 1st C A B D 2nd 3rd 4th

Run – off Method You only keep the top two first place voters and have an election between those two.

Example 8 9 5 4 2 1st C E B A 2nd D 3rd 4th 5th

Condorcet Criterion If candidate X can defeat each of the other candidates in a head-to-head vote, then X is the winner of the election. Say you have candidates: A,B,C,D First say A vs. B if B wins Then try B vs. C if B wins Then try B vs. D However, if C won in step 2 then you have to go back and check C vs. A and C vs. D

Example A B C

Assignments Classwork – Pg 33-35 27 (a,b,c, Run-off), 29 (a,b, Run-off), 31, 33 (a,b, Run – off) Homework - Pg 33-35 28 (Run-off), 30 (Run- off), 32, 34 (a,b, Run – off)