In economics and political science, the theoretical literature on social choice routinely highlights worst-case scenarios and emphasizes the nonexistence of a universally best voting method. Behavioral social choice is grounded in psychology and tackles consensus methods descriptively and empirically. We analyzed four elections of the American Psychological Association using a state-of-the-art ...

In 1960, C. Domb published a paper entitled On the theory of cooperative phenomena in crystals in which he presented an expression for the number of cycles of length l in a triangular lattice. This expression was erroneous. We present a correct expression and we show that it is linked, in social choice theory, to the probability that all candidates are tied in an election with the Borda rule.

We model Monroe’s and Chamberlin and Courant’s multiwinner voting systems as a certain resource allocation problem. We show that for many restricted variants of this problem, under standard complexity-theoretic assumptions there are no constant-factor approximation algorithms. Yet, we also show cases where good approximation algorithms exist (these variants correspond to optimizing total voter ...

On personal and professional levels, the Marquis de Condorcet did like his fellow Academy member J.C. Borda. It is not clear why; maybe it was the regrettable tension that sometimes exists between abstract and applied mathematicians, or maybe Condorcet harbored jealousy over Borda beating him by over a decade in recognizing the complex and interesting mathematical issues that arise in the socia...

In this paper, we present our methods for the 2016 CLPPsych shared task. We extracted and selected eight features from the corpus consisting of posts from ReachOut.com including the information of the post’s source board, numbers of kudos and views, post time, ranks of the authors, unigram of the body and subject, frequency of the used emotion icons, and the topic model features. Two support ve...

Some measures such as mean average precision and recall level precision are considered as good system-oriented measures, because they concern both precision and recall that are two important aspects for effectiveness evaluation of information retrieval systems. However, such good system-oriented measures suffer from some shortcomings when partial relevance judgments are used. In this paper, we ...