Scale invariance: Difference between revisions

Scale invariance can refer to one of two criteria: a cardinal voting method criterion and an ordinal one.

The [[Cardinal voting systems#Scale%20invariance|cardinal method criterion]] is:

{{Definition|Multiplying every ballot's score of every candidate by a constant <math>\alpha>0</math> should not change the outcome.}}

The ordinal method criterion is:

{{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.}}

Both 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.

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==References==

[[Category:Voting system criteria]]