Search (3 results, page 1 of 1)

  • × author_ss:"Robertson, S.E."
  • × type_ss:"p"
  1. Robertson, S.E.: OKAPI at TREC (1994) 0.00 
    3.2888478E-4 = product of:
  0.0049332716 = sum of:
    0.0049332716 = product of:
      0.009866543 = sum of:
        0.009866543 = weight(_text_:information in 7952) [ClassicSimilarity], result of:
          0.009866543 = score(doc=7952,freq=2.0), product of:
            0.050870337 = queryWeight, product of:
              1.7554779 = idf(docFreq=20772, maxDocs=44218)
              0.028978055 = queryNorm
            0.19395474 = fieldWeight in 7952, 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=7952)
      0.5 = coord(1/2)
  0.06666667 = coord(1/15)
    Abstract
    Paper presented at the Text Retrieval Conference (TREC), Washington, DC, Nov 1992. Describes the OKAPI experimental text information retrieval system in terms of its design principles: the use of simple, robust and easy to use techniques which use best match searching and avoid Boolean logic
  2. Robertson, S.E.: OKAPI at TREC-1 (1994) 0.00 
    3.2888478E-4 = product of:
  0.0049332716 = sum of:
    0.0049332716 = product of:
      0.009866543 = sum of:
        0.009866543 = weight(_text_:information in 7953) [ClassicSimilarity], result of:
          0.009866543 = score(doc=7953,freq=2.0), product of:
            0.050870337 = queryWeight, product of:
              1.7554779 = idf(docFreq=20772, maxDocs=44218)
              0.028978055 = 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)
      0.5 = coord(1/2)
  0.06666667 = coord(1/15)
    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
  3. Robertson, S.E.: OKAPI at TREC-3 (1995) 0.00 
    2.3021935E-4 = product of:
  0.00345329 = sum of:
    0.00345329 = product of:
      0.00690658 = sum of:
        0.00690658 = weight(_text_:information in 5694) [ClassicSimilarity], result of:
          0.00690658 = score(doc=5694,freq=2.0), product of:
            0.050870337 = queryWeight, product of:
              1.7554779 = idf(docFreq=20772, maxDocs=44218)
              0.028978055 = 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)
      0.5 = coord(1/2)
  0.06666667 = coord(1/15)
    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

Themes