Year: 2023
Type: article
Abstract: The seminal Bradley-Terry model exhibits transitivity, that is, the property that the probabilities of player A beating B and B beating C give the probability of A beating C, with these probabilities determined by a skill parameter for each player. Such transitive models do not account for different strategies of play between each pair of players, which gives rise to intransitivity. Various intransitive parametric models have been proposed but they lack the flexibility to cover the different strategies across n players, with the O(n2) values of intransitivity modeled using O(n) parameters, while they are not parsimonious when the intransitivity is simple. We overcome their lack of adaptability by allocating each pair of players to one of a random number of K intransitivity levels, each level representing a different strategy. Our novel approach for the skill parameters involves having the n players allocated to a random number of A<n distinct skill levels, to improve efficiency and avoid false rankings. Although we may have to estimate up to O(n2) unknown parameters for (A,K) we anticipate that in many practical contexts A+K
Authors: Jess Spearing, Jonathan Tawn, David Irons, Tim Paulden
Institution: Lancaster University
Language: English
Subfield: Economics and Econometrics
Domain: Social Sciences
Open Access status: hybrid
OpenAlex ID: W3136469616