Lec 7 - Can Democracy Work? 2/03/09 Diversions in STV Droop...

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Unformatted text preview: Can Democracy Work? 2/03/09 Diversions in STV Droop Quota: q= (V/(S+1) + 1) Steps: 1) award seats to candidates with q first-place votes. 2) distribute excess votes (v>q) to second place candidate Redistribution done by a variety of methods Proportional most common (candidates share of redistributed votes = share of second preferences) Still room for manipulation 3) repeat until seats filled 4) if no candidate has v>q, eliminate last-place candidate and redistribute votes to second place candidates. STV with 3 Seats Quota= [100/(3+1)] +1 = 26 15 ballotsP-Q-R 20 ballotsS-T 15 ballotsP-R-Q 9 ballots T-S 8 ballots Q-P-R 17 ballotsU 3 ballots R-P-Q 13 ballotsV Candidate First count Second count Third count Fourth count Fifth count Sixth count P 30-4 = 26 26 26 26 26 Q 8 +2 = 10 +5 = 15 15 15 15 R 3 +2 = 5-5 = 0 S 20 20 20 +9 = 29-3 = 26 26 T 9 9 9-9 = 0 U 17 17 17 17 17 17 V 13 13 13 13 13 13 = 0 Non- transfer....
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Lec 7 - Can Democracy Work? 2/03/09 Diversions in STV Droop...

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