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Activity 3 Improving on Plurality? Decision methods using ordinal ballots.

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Presentation on theme: "Activity 3 Improving on Plurality? Decision methods using ordinal ballots."— Presentation transcript:

1 Activity 3 Improving on Plurality? Decision methods using ordinal ballots

2 The Infamous Pizza Election! # of profiles 8567 Pepperoni HamVeggieSausage HamVeggieHam VeggieSausage Veggie Sausage Pepperoni

3 Standard Run-off Keep the two alternatives with the most first place votes and compare them head to head.

4 Sequential Run-off (Hare elimination) Repeatedly eliminate the choice or choices with the fewest first place votes until someone has a majority.

5 Coombs Method Eliminate the choice or choices with the most last place votes. Continue until someone has a majority.

6 Sequential Pairwise Run-off First, one pair of choices is considered and a vote taken The winner is then paired with another choice and a vote taken. The procedure of pairing and voting continues until a final winner is selected.

7 There are n alternatives. How many pairings are necessary to arrive at a winner? Try this for 3, then 4 and then 5, and look for a pattern to determine your answer.

8 The Agenda Effect JacobMomDad Star Wars Dances with Wolves Beauty and the Beast Sound of Music Star Wars Dances with Wolves Beauty and the Beast Dances with Wolves Beauty and the Beast Sound of Music Star Wars


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