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Robertson, S.E.: OKAPI at TREC-1 (1994)
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3.51858E-4 = product of: 0.0063334443 = sum of: 0.0063334443 = weight(_text_:in in 7953) [ClassicSimilarity], result of: 0.0063334443 = score(doc=7953,freq=4.0), product of: 0.029798867 = queryWeight, product of: 1.3602545 = idf(docFreq=30841, maxDocs=44218) 0.021906832 = queryNorm 0.21253976 = fieldWeight in 7953, product of: 2.0 = tf(freq=4.0), with freq of: 4.0 = termFreq=4.0 1.3602545 = idf(docFreq=30841, maxDocs=44218) 0.078125 = fieldNorm(doc=7953) 0.055555556 = coord(1/18)
- Abstract
- Describes the work carried out on the TREC-2 project following the results of the TREC-1 project. Experiments were conducted on the OKAPI experimental text information retrieval system which investigated a number of alternative probabilistic term weighting functions in place of the 'standard' Robertson Sparck Jones weighting functions used in TREC-1
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Robertson, S.E.: OKAPI at TREC-3 (1995)
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2.4630062E-4 = product of: 0.004433411 = sum of: 0.004433411 = weight(_text_:in in 5694) [ClassicSimilarity], result of: 0.004433411 = score(doc=5694,freq=4.0), product of: 0.029798867 = queryWeight, product of: 1.3602545 = idf(docFreq=30841, maxDocs=44218) 0.021906832 = queryNorm 0.14877784 = fieldWeight in 5694, product of: 2.0 = tf(freq=4.0), with freq of: 4.0 = termFreq=4.0 1.3602545 = idf(docFreq=30841, maxDocs=44218) 0.0546875 = fieldNorm(doc=5694) 0.055555556 = coord(1/18)
- Abstract
- Reports text information retrieval experiments performed as part of the 3 rd round of Text Retrieval Conferences (TREC) using the Okapi online catalogue system at City University, UK. The emphasis in TREC-3 was: further refinement of term weighting functions; an investigation of run time passage determination and searching; expansion of ad hoc queries by terms extracted from the top documents retrieved by a trial search; new methods for choosing query expansion terms after relevance feedback, now split into methods of ranking terms prior to selection and subsequent selection procedures; and the development of a user interface procedure within the new TREC interactive search framework
- Theme
- Semantisches Umfeld in Indexierung u. Retrieval