Robertson, S.E.: OKAPI at TREC-3 (1995)
0.00
0.001463158 = product of:
0.008778948 = sum of:
0.008778948 = weight(_text_:in in 5694) [ClassicSimilarity], result of:
0.008778948 = score(doc=5694,freq=4.0), product of:
0.059007097 = queryWeight, product of:
1.3602545 = idf(docFreq=30841, maxDocs=44218)
0.043379452 = 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)
0.16666667 = 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
- Theme
- Semantisches Umfeld in Indexierung u. Retrieval