Search (2 results, page 1 of 1)
- Did you mean:
- editor's%3a%22National information standards organization%22 2
- editore%3a%22National information standards organization%22 2
- editores%3a%22National information standards organization%22 2
- editor%3a%22National information standards organization%22 2
- editions%3a%22National information standards organization%22 2
-
Robertson, S.E.: OKAPI at TREC-1 (1994)
0.00
0.0049007274 = product of: 0.01960291 = sum of: 0.01960291 = weight(_text_:information in 7953) [ClassicSimilarity], result of: 0.01960291 = score(doc=7953,freq=2.0), product of: 0.10106951 = queryWeight, product of: 1.7554779 = idf(docFreq=20772, maxDocs=44218) 0.057573788 = queryNorm 0.19395474 = fieldWeight in 7953, product of: 1.4142135 = tf(freq=2.0), with freq of: 2.0 = termFreq=2.0 1.7554779 = idf(docFreq=20772, maxDocs=44218) 0.078125 = fieldNorm(doc=7953) 0.25 = coord(1/4)
- 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
-
Robertson, S.E.: OKAPI at TREC-3 (1995)
0.00
0.0034305095 = product of: 0.013722038 = sum of: 0.013722038 = weight(_text_:information in 5694) [ClassicSimilarity], result of: 0.013722038 = score(doc=5694,freq=2.0), product of: 0.10106951 = queryWeight, product of: 1.7554779 = idf(docFreq=20772, maxDocs=44218) 0.057573788 = queryNorm 0.13576832 = fieldWeight in 5694, product of: 1.4142135 = tf(freq=2.0), with freq of: 2.0 = termFreq=2.0 1.7554779 = idf(docFreq=20772, maxDocs=44218) 0.0546875 = fieldNorm(doc=5694) 0.25 = coord(1/4)
- 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