Robertson, S.E.: OKAPI at TREC-3 (1995)
0.01
0.0073642298 = product of:
0.044185378 = sum of:
0.044185378 = weight(_text_:searching in 5694) [ClassicSimilarity], result of:
0.044185378 = score(doc=5694,freq=2.0), product of:
0.14122958 = queryWeight, product of:
4.0452914 = idf(docFreq=2103, maxDocs=44218)
0.03491209 = queryNorm
0.31286204 = fieldWeight in 5694, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
4.0452914 = idf(docFreq=2103, maxDocs=44218)
0.0546875 = fieldNorm(doc=5694)
0.16666667 = coord(1/6)
- 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