ER-Bucklin: Difference between revisions
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''ER-Bucklin is an old name for [[Majority Choice Approval]] (MCA). Please see that article, which mostly supersedes the following.''
== Definition ==
It is a rated version of [[Bucklin voting]] that allows voters to give equal rankings to some candidates. There are at least two main versions of ER-Bucklin; these are '''ER-Bucklin (whole)''' and '''ER-Bucklin (fractional)'''.
== ER-Bucklin (whole) ==▼
▲== ER-Bucklin(whole) ==
''If a ballot lists n candidates as tied in kth place, count that ballot as a whole point for all n candidates beginning in the kth round.''
Note: A candidate is ranked in kth place on a given ballot if there are k-1 candidates who are ranked strictly higher. For
This rule is perhaps unique in that it satisfies both the "[[favorite betrayal]]" criterion and the [[Majority criterion for solid coalitions]].
== ER-Bucklin (fractional) ==
''If a ballot lists n candidates as tied in kth place, count that ballot as 1/n point for all n candidates in the kth round, adding another 1/n point in each subsequent round until the ballot has contributed 1 point to all n candidates.''
== Example ==
Line 26 ⟶ 24:
:::''or'':
{| class="wikitable" border="1"
!#
!1st
Line 51 ⟶ 49:
|
|}
=== ER-Bucklin(whole) tally ===
{| class="wikitable" border="1"
!candidate
!round 1
Line 76 ⟶ 73:
|30
|}
There is a tie between B1 and B2.
=== ER-Bucklin(fractional) tally ===
{| class="wikitable" border="1"
!candidate
!round 1
Line 107 ⟶ 102:
A wins.
''
== See also ==
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