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Idiosyncratic properties of Australian STV election counting

Andrew Conway, Michelle Blom, Alexander Ek, Peter J. Stuckey, Vanessa J. Teague, Damjan Vukcevic

Abstract

Single Transferable Vote (STV) counting, used in several jurisdictions in Australia, is a system for choosing multiple election winners given voters' preferences over candidates. There are a variety of different versions of STV legislated and/or applied across Australia. This paper shows some of the unintuitive properties of some of these systems.

Idiosyncratic properties of Australian STV election counting

Abstract

Single Transferable Vote (STV) counting, used in several jurisdictions in Australia, is a system for choosing multiple election winners given voters' preferences over candidates. There are a variety of different versions of STV legislated and/or applied across Australia. This paper shows some of the unintuitive properties of some of these systems.
Paper Structure (4 sections)

This paper contains 4 sections.

Table of Contents

  1. Fallacy 1: Candidates cannot get a negative tally.
  2. Fallacy 2: Votes cannot increase in value during tabulation.
  3. Fallacy 3: Taking votes away from a loser cannot make them win.
  4. Conclusion