Robertson, S.E.: OKAPI at TREC-3 (1995)
0.02
0.021974515 = product of:
0.06592354 = sum of:
0.06592354 = product of:
0.09888531 = sum of:
0.03634593 = weight(_text_:online in 5694) [ClassicSimilarity], result of:
0.03634593 = score(doc=5694,freq=2.0), product of:
0.1548489 = queryWeight, product of:
3.0349014 = idf(docFreq=5778, maxDocs=44218)
0.051022716 = queryNorm
0.23471867 = fieldWeight in 5694, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.0349014 = idf(docFreq=5778, maxDocs=44218)
0.0546875 = fieldNorm(doc=5694)
0.062539384 = weight(_text_:retrieval in 5694) [ClassicSimilarity], result of:
0.062539384 = score(doc=5694,freq=6.0), product of:
0.15433937 = queryWeight, product of:
3.024915 = idf(docFreq=5836, maxDocs=44218)
0.051022716 = queryNorm
0.40520695 = fieldWeight in 5694, product of:
2.4494898 = tf(freq=6.0), with freq of:
6.0 = termFreq=6.0
3.024915 = idf(docFreq=5836, maxDocs=44218)
0.0546875 = fieldNorm(doc=5694)
0.6666667 = coord(2/3)
0.33333334 = coord(1/3)
- 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