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 complaints of the thirtieth annual eu 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 offered including the abstracts of three invited lectures and 32 poster papers have been conscientiously reviewed and chosen from 139 complete article submissions. The papers are prepared in topical sections on overview, net IR, social media, cross-lingual details retrieval, conception, video, illustration, wikipedia and e-books, in addition to specialist search.

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Here or There 23 Table 5. 662 ppref (a) Correlation between tion measures. 000 NDCG ppref (b) Agreement on ences. 941 system differ- A simple but intuitive measure is the proportion of pairs that are correctly ordered by the engine. We call this “precision of preferences” or ppref for short. More formally, over all pairs of pages i, j such that i is preferred to j by an assessor, ppref is the proportion for which the engine ranked i above j. 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.

This supports modeling of various searcher/task scenarios regarding searcher impatience vs. persistence and regarding task/context dependent constraints and time limitations. • For individual sessions, it supports identifying unsuccessful and successful reformulations, aiding searcher behavior analysis and system development. • By selecting the assumed result scanning length (or recording observed searcher behavior) before stopping, it supports representing entire sessions by gain vectors that can be compared to each other or to ideal performance.

Short results lists: Some queries return few or no hits. Concatenating short results lists “as is” ignores the time spent looking at a short or empty list and reformulating 14 K. Järvelin et al. the query. In this study we padded concatenated lists to a fixed length (10) but a hybrid approach might be used, assessing a minimum penalty per query. • Duplicates: Documents are often returned multiple times by different queries in a session. In truly user-based evaluation, the searcher is free to score duplicates as relevant or non-relevant.

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