U3A Web Groups

Counting Heads (2): Voting Systems

In a forthcoming referendum, we will be asked to decide whether to change our current system for electing British MPs. Different systems are used throughout the world in different circumstances, many of which are described in Wikipedia. "Since voting involves counting, it is algorithmic in nature", so software simulation can be used to show that "different voting systems may give very different results" from the same electoral choices.

 

Simulation models


 

Single-winner methods


 

Preference systems


 

Multiple winner systems


 

Pairwise comparisons