Scale invariance: Difference between revisions
Dr. Edmonds (talk | contribs) No edit summary |
m (Rearrange strong variant, touch up grammar.) |
||
Line 5: | Line 5: | ||
{{Definition|Multiplying every ballot's score of every candidate by a constant <math>\alpha>0</math> should not change the outcome.}} |
{{Definition|Multiplying every ballot's score of every candidate by a constant <math>\alpha>0</math> should not change the outcome.}} |
||
with a stronger variant being |
|||
⚫ | |||
{{Definition| |
{{Definition|Multiplying one or more ballot's score of every candidate by a constant <math>\alpha>0</math> should not change the outcome.}} |
||
⚫ | |||
Strong variant, for [[Cardinal voting systems#Scale%20invariance|cardinal method]] is: |
|||
{{Definition| |
{{Definition|For every way of ranking the candidates, multiplying the number of voters who express this preference by a constant <math>\alpha>0</math> should not change the outcome.}} |
||
These criteria represent a desideratum that the method should not rely on absolute numbers when selecting a winner, just on the candidates' or factions' relative support. |
These criteria represent a desideratum that the method should not rely on absolute numbers when selecting a winner, just on the candidates' or factions' relative support. |
||
Line 17: | Line 17: | ||
{{stub}} |
{{stub}} |
||
== |
==See also== |
||
* [[Single distributed vote]] |
* [[Single distributed vote]] |
Revision as of 19:43, 14 July 2021
Scale invariance can refer to one of two criteria: a cardinal voting method criterion and an ordinal one.
The cardinal method criterion is:
Multiplying every ballot's score of every candidate by a constant should not change the outcome.
with a stronger variant being
Multiplying one or more ballot's score of every candidate by a constant should not change the outcome.
The ordinal method criterion is also called the homogeneity criterion. It is:
For every way of ranking the candidates, multiplying the number of voters who express this preference by a constant should not change the outcome.
These criteria represent a desideratum that the method should not rely on absolute numbers when selecting a winner, just on the candidates' or factions' relative support.
This page is a stub - please add to it.