Document (#16034)

Author

Robertson, S.E.
Walker, S.
Hancock-Beaulieu, M.M.

Title

Large test collection experiments of an operational, interactive system : OKAPI at TREC

Source

Information processing and management. 31(1995) no.3, S.345-360

Year

1995

Abstract

The Okapi system has been used in a series of experiments on the TREC collections, investiganting probabilistic methods, relevance feedback, and query expansion, and interaction issues. Some new probabilistic models have been developed, resulting in simple weigthing functions that take account of document length and within document and within query term frequency. All have been shown to be beneficial when based on large quantities of relevance data as in the routing task. Interaction issues are much more difficult to evaluate in the TREC framework, and no benefits have yet been demonstrated from feedback based on small numbers of 'relevant' items identified by intermediary searchers

Theme

Retrievalstudien
Semantisches Umfeld in Indexierung u. Retrieval

Object

Okapi

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3. Beaulieu, M.; Robertson, S.; Rasmussen, E.: Evaluating interactive systems in TREC (1996) 0.45

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4. Hancock-Beaulieu, M.; Fieldhouse, M.; Do, T.: ¬An evaluation of interactive query expansion in an online library catalogue with a graphical user interface (1995) 0.38

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5. Hancock-Beaulieu, M.; Walker, S.: ¬An evaluation of automatic query expansion in an online library catalogue (1992) 0.38

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