Advances in Information Retrieval: 30th European Conference by Nicholas J. Belkin (auth.), Craig Macdonald, Iadh Ounis,


By Nicholas J. Belkin (auth.), Craig Macdonald, Iadh Ounis, Vassilis Plachouras, Ian Ruthven, Ryen W. White (eds.)

This ebook constitutes the refereed court cases of the thirtieth annual ecu convention on details Retrieval learn, ECIR 2008, held in Glasgow, united kingdom, in March/April 2008.

The 33 revised complete papers and 19 revised brief papers provided including the abstracts of three invited lectures and 32 poster papers have been rigorously reviewed and chosen from 139 complete article submissions. The papers are equipped in topical sections on overview, internet IR, social media, cross-lingual details retrieval, conception, video, illustration, wikipedia and e-books, in addition to professional search.

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If neither i nor j is ranked, ppref ignores the pair. If i is ranked but j is not, ppref considers i to have been ranked above j. The pairs in ppref can be weighted for a measure we call wpref. We use a rank-based weighting scheme: for pages at ranks i and j such that j > i, let 1 . wpref is then the sum of weights wij over pairs i, j the weight wij = log (j+1) 2 such that i is preferred to j and the rank of i is less than the rank of j. The normalizing constant is the sum of all weights wij . 1 Results We compared evaluations between four different measures: DCG, normalized DCG (NDCG), ppref, and wpref.

1 Transitivity If assessors are consistently transitive, the full set of judgments is not necessary; this is the idea behind comparative sorting algorithms such as heapsort. The rate of growth in the number of comparisons needed by these algorithms is in O(n lg n), much slower than the O(n2 ) growth rate of all comparisons. To evaluate transitivity, we iterated over all triplets of documents i, j, k in each set of preference judgments. We counted the number of times that, if i was preferred to j and j was preferred to k, the assessor also preferred i to k.

Thence statistical testing is not affected by outliers, scenarios returning many highly relevant documents. S. National Science Foundation, grant numbers 0514238, 0511050 and 0534762. References 1. : The design of Browsing and Berrypicking Techniques for the Online Search Interface. Online Review 13(5), 407–424 (1989) 2. : Evaluating Iinteractive Systems in TREC. Journal of the American Society for Information Science 47(1), 85–94 (1996) 3. : The Turn: Integration of Information Seeking and Retrieval in Context.

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