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What Deliberately Degrading Search Quality Tells Us About Discount Functions

Thomas, Paul; Jones, Timothy; Hawking, David


Deliberate degradation of search results is a common tool in user experiments. We degrade high-quality search results by inserting non-relevant documents at different ranks. The effect of these manipulations, on a number of commonly-used metrics, is counter-intuitive: the discount functions implicit in P@k, MRR, NDCG, and others do not account for the true relationship between rank and value to the user. We propose an alternative, based on visibility data.

CollectionsANU Research Publications
Date published: 2011
Type: Conference paper
Source: Proceedings of the 34th International ACM SIGIR Conference on Research and Development in Information Retrieval
DOI: 10.1145/2009916.2010072


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