Commutative Algebra of Statistical Ranking

Details Commutative Algebra of Statistical Ranking Commutative Algebra of Statistical Ranking

2011-01-08

arxiv.org/abs/1101.1597v2

Mathematics

Commutative Algebra

25 pages

Scientific paper

A model for statistical ranking is a family of probability distributions whose states are orderings of a fixed finite set of items. We represent the orderings as maximal chains in a graded poset. The most widely used ranking models are parameterized by rational function in the model parameters, so they define algebraic varieties. We study these varieties from the perspective of combinatorial commutative algebra. One of our models, the Plackett-Luce model, is non-toric. Five others are toric: the Birkhoff model, the ascending model, the Csiszar model, the inversion model, and the Bradley-Terry model. For these models we examine the toric algebra, its lattice polytope, and its Markov basis.

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