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Ranking Distributions based on Noisy Sorting
Adil El Mesaoudi-Paul · Eyke Hüllermeier · Robert Busa-Fekete

Thu Jul 12 09:15 AM -- 12:00 PM (PDT) @ Hall B #32

We propose a new statistical model for ranking data, i.e., a new family of probability distributions on permutations. Our model is inspired by the idea of a data-generating process in the form of a noisy sorting procedure, in which deterministic comparisons between pairs of items are replaced by Bernoulli trials. The probability of producing a certain ranking as a result then essentially depends on the Bernoulli parameters, which can be interpreted as pairwise preferences. We show that our model can be written in closed form if insertion or quick sort are used as sorting algorithms, and propose a maximum likelihood approach for parameter estimation. We also introduce a generalization of the model, in which the constraints on pairwise preferences are relaxed, and for which maximum likelihood estimation can be carried out based on a variation of the generalized iterative scaling algorithm. Experimentally, we show that the models perform very well in terms of goodness of fit, compared to existing models for ranking data.

Author Information

Adil El Mesaoudi-Paul (University of Paderborn)
Eyke Hüllermeier (Paderborn University)
Robert Busa-Fekete (Yahoo Research)

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