Definition
Precision-oriented evaluation in information retrieval considers the relevance of the top n search results, for small n and using a set of relevance judgments that need not be complete. Such “shallow” evaluation is consistent with a user who only cares about the top-ranked documents. Relaxing the requirement of identifying all relevant documents for every query means that certain measures, such as recall at n, cannot be applied. However, it also allows evaluation on a very large corpus, where employing human relevance assessors to find the complete relevant set for each query would be too expensive. Both aspects of precision-oriented evaluation, the shallow viewing of results and the large corpus, are associated with Web search, where search results are typically a top-10 and the corpus may contain tens of billions of documents.
Historical Background
The Cranfield II experiments in 1963 were a landmark effort in information retrieval evaluation [3]. A test collection...
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Craswell, N. (2018). Precision-Oriented Effectiveness Measures. In: Liu, L., Özsu, M.T. (eds) Encyclopedia of Database Systems. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-8265-9_476
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