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- W2952371671 abstract "Understanding the correlation between two different scores for the same set of items is a common problem in information retrieval, and the most commonly used statistics that quantifies this correlation is Kendall's $tau$. However, the standard definition fails to capture that discordances between items with high rank are more important than those between items with low rank. Recently, a new measure of correlation based on average precision has been proposed to solve this problem, but like many alternative proposals in the literature it assumes that there are no ties in the scores. This is a major deficiency in a number of contexts, and in particular while comparing centrality scores on large graphs, as the obvious baseline, indegree, has a very large number of ties in web and social graphs. We propose to extend Kendall's definition in a natural way to take into account weights in the presence of ties. We prove a number of interesting mathematical properties of our generalization and describe an $O(nlog n)$ algorithm for its computation. We also validate the usefulness of our weighted measure of correlation using experimental data." @default.
- W2952371671 created "2019-06-27" @default.
- W2952371671 creator A5027824085 @default.
- W2952371671 date "2014-04-12" @default.
- W2952371671 modified "2023-09-23" @default.
- W2952371671 title "A Weighted Correlation Index for Rankings with Ties" @default.
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