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| hare_voting_procedure [2009/02/09 14:30] – jtkorb | hare_voting_procedure [2009/02/09 15:07] (current) – jtkorb |
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| ====== Hare Voting Procedure ====== | ====== Hare Voting Procedure ====== |
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| The [[http://sof.uchicago.edu/hare|Hare System of Proportional Representation]] (also described as the [[http://en.wikipedia.org/wiki/Hare_quota|Hare Quota]]) is a variant of the [[http://en.wikipedia.org/wiki/Single_transferable_vote|Single Transferable Vote (STV)]] preferential voting system. It is "preferential" in the sense that voters rank the order of their chosen candidates (using, say, numbers 1-5), rather than using an unranked mark (e.g., one or more "X"s). A common application is in the selection of committees, in which multiple winners must be chosen from a set of available candidates. | The [[http://sof.uchicago.edu/hare|Hare System of Proportional Representation]] is a procedural description of the [[http://en.wikipedia.org/wiki/Single_transferable_vote|Single Transferable Vote (STV)]] preferential voting system. It is "preferential" in the sense that voters rank the order of their chosen candidates (using, say, numbers 1-5), rather than using an unranked mark (e.g., one or more "X"s). A common application is in the selection of committees, in which multiple winners must be chosen from a set of available candidates. |
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| | (Note: The quota calculation described in this document and used in the associated software is actually based on the [[http://en.wikipedia.org/wiki/Droop_quota|Droop Quota]], not the [[http://en.wikipedia.org/wiki/Hare_quota|Hare Quota]]. The term //Hare// is retained here as the common name for //Single Transferable Vote// despite this inaccurate characterization.) |
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| ====== Background ====== | ====== Background ====== |
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| The first step in the process is to divide the ballots into sets based on the first candidate listed on each ballot. | The first step in the process is to divide the ballots into sets based on the first candidate listed on each ballot. |
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| ===== Selection Step ==== | ===== Selection Step ==== |
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| In order to be selected, a candidate must have a minimum number of votes, called the //quota//, which is roughly the number of votes cast divided by the number of positions to be filled. More precisely, the College of Science defines the //quota// to be //(votes cast + 1)/(number of positions + 1)// rounded up. | In order to be selected, a candidate must have a minimum number of votes, called the //quota//, which is roughly the number of votes cast divided by the number of positions to be filled. More precisely, the College of Science defines the //quota// to be //(votes cast + 1)/(number of positions + 1)// rounded up. (As a side note, this quota calculation is actually closer to the "Droop" quota than the "Hare" quota, but we retain the older terminology to apply to the entire Single-Transferable-Vote process.) |
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| while there is a candidate that has the minimum number of votes | while there is a candidate that has the minimum number of votes |
