Journal article

A Similarity Measure for Indefinite Rankings

William Webber, Alistair Moffat, Justin Zobel

ACM Transactions on Information Systems | ASSOC COMPUTING MACHINERY | Published : 2010


Ranked lists are encountered in research and daily life and it is often of interest to compare these lists even when they are incomplete or have only some members in common. An example is document rankings returned for the same query by different search engines. A measure of the similarity between incomplete rankings should handle nonconjointness, weight high ranks more heavily than low, and be monotonic with increasing depth of evaluation; but no measure satisfying all these criteria currently exists. In this article, we propose a new measure having these qualities, namely rank-biased overlap (RBO). The RBO measure is based on a simple probabilistic user model. It provides monotonicity by c..

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Funding Acknowledgements

This work was supported by the Australian Research Council and by National ICT Australia (NICTA). NICTA is funded by the Australian Government's Backing Australia's Ability initiative, in part through the Australian Research Council.