Monotonicity Anomalies in Scottish Local Government Elections

• Tác giả: Adam Graham-Squire, David McCune
• Ngôn ngữ: eng
• Ký hiệu phân loại: 344.11 Labor, social service, education, cultural law
• Thông tin xuất bản: 2023
• Bộ sưu tập: Metadata
• ID: 197376

Tóm tắt

Comment: 42 pagesSingle Transferable Vote (STV) is a voting method used to elect multiple candidates in ranked-choice elections. One weakness of STV is that it fails multiple fairness criteria related to monotonicity and no show paradoxes. We analyze 1,079 local government STV elections in Scotland to estimate the frequency of such monotonicity anomalies in real-world elections, and compare our results with prior empirical and theoretical research about the rates at which such anomalies occur. In 62 of the 1079 elections we found some kind of monotonicity anomaly. We generally find that the rates of anomalies are similar to prior empirical research and much lower than what most theoretical research has found. The STV anomalies we find are the first of their kind to be documented in real-world multiwinner elections.