you don't calculate it in IRV, you just go straight to simple majority.
The Droop quota is (votes/(seats+1)) + 1. For a single seat, this equals "half the votes, plus 1". That is the definition of a "simple majority".
You could use a different quota, where all a candidate would need is 40% of the vote to win, so in the following scenario:
40% Bush > Gore > Nader 29% Nader > Gore > Bush 31% Gore > Nader > Bush
Bush would simply win in the first round, whereas with the Droop quota (IRV) he would lose to Gore after Nader was dropped.
This isn't just speculation. There is at least one country that uses top-two runoff (hold a second election between the top-two finishers if no one gets a quota) where the the quota is not 50%, but 40%.
So let me repeat - IRV IS STV, with a Droop quota. The math is identical.
But again, I welcome you to try to present me with a hypothetical election scenario where STV with a Droop quota would pick a different winner than IRV (or do anything different at all).
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timeasmymeasure
no subject
Date: 2007-02-10 10:31 pm (UTC)The Droop quota is (votes/(seats+1)) + 1. For a single seat, this equals "half the votes, plus 1". That is the definition of a "simple majority".
You could use a different quota, where all a candidate would need is 40% of the vote to win, so in the following scenario:
40% Bush > Gore > Nader
29% Nader > Gore > Bush
31% Gore > Nader > Bush
Bush would simply win in the first round, whereas with the Droop quota (IRV) he would lose to Gore after Nader was dropped.
This isn't just speculation. There is at least one country that uses top-two runoff (hold a second election between the top-two finishers if no one gets a quota) where the the quota is not 50%, but 40%.
So let me repeat - IRV IS STV, with a Droop quota. The math is identical.
But again, I welcome you to try to present me with a hypothetical election scenario where STV with a Droop quota would pick a different winner than IRV (or do anything different at all).