Robertson, S.E.: OKAPI at TREC-3 (1995)
0.01
0.013585954 = product of:
0.08151572 = sum of:
0.08151572 = weight(_text_:ranking in 5694) [ClassicSimilarity], result of:
0.08151572 = score(doc=5694,freq=2.0), product of:
0.19485836 = queryWeight, product of:
5.4090285 = idf(docFreq=537, maxDocs=44218)
0.03602465 = queryNorm
0.4183332 = fieldWeight in 5694, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
5.4090285 = idf(docFreq=537, 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