Search (3 results, page 1 of 1)

  • × author_ss:"Robertson, S.E."
  • × type_ss:"p"
  1. Robertson, S.E.: OKAPI at TREC-3 (1995) 0.01 
    0.00772941 = product of:
  0.02834117 = sum of:
    0.003865826 = weight(_text_:a in 5694) [ClassicSimilarity], result of:
      0.003865826 = score(doc=5694,freq=4.0), product of:
        0.030653298 = queryWeight, product of:
          1.153047 = idf(docFreq=37942, maxDocs=44218)
          0.026584605 = queryNorm
        0.12611452 = fieldWeight in 5694, product of:
          2.0 = tf(freq=4.0), with freq of:
            4.0 = termFreq=4.0
          1.153047 = idf(docFreq=37942, maxDocs=44218)
          0.0546875 = fieldNorm(doc=5694)
    0.0024304248 = weight(_text_:s in 5694) [ClassicSimilarity], result of:
      0.0024304248 = score(doc=5694,freq=2.0), product of:
        0.028903782 = queryWeight, product of:
          1.0872376 = idf(docFreq=40523, maxDocs=44218)
          0.026584605 = queryNorm
        0.08408674 = fieldWeight in 5694, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          1.0872376 = idf(docFreq=40523, maxDocs=44218)
          0.0546875 = fieldNorm(doc=5694)
    0.02204492 = weight(_text_:u in 5694) [ClassicSimilarity], result of:
      0.02204492 = score(doc=5694,freq=2.0), product of:
        0.08704981 = queryWeight, product of:
          3.2744443 = idf(docFreq=4547, maxDocs=44218)
          0.026584605 = queryNorm
        0.25324488 = fieldWeight in 5694, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.2744443 = idf(docFreq=4547, maxDocs=44218)
          0.0546875 = fieldNorm(doc=5694)
  0.27272728 = coord(3/11)
    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
    Pages
    27 S
    Theme
    Semantisches Umfeld in Indexierung u. Retrieval
  2. Robertson, S.E.: OKAPI at TREC-1 (1994) 0.00 
    0.0013412925 = product of:
  0.0073771086 = sum of:
    0.0039050733 = weight(_text_:a in 7953) [ClassicSimilarity], result of:
      0.0039050733 = score(doc=7953,freq=2.0), product of:
        0.030653298 = queryWeight, product of:
          1.153047 = idf(docFreq=37942, maxDocs=44218)
          0.026584605 = queryNorm
        0.12739488 = fieldWeight in 7953, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          1.153047 = idf(docFreq=37942, maxDocs=44218)
          0.078125 = fieldNorm(doc=7953)
    0.0034720355 = weight(_text_:s in 7953) [ClassicSimilarity], result of:
      0.0034720355 = score(doc=7953,freq=2.0), product of:
        0.028903782 = queryWeight, product of:
          1.0872376 = idf(docFreq=40523, maxDocs=44218)
          0.026584605 = queryNorm
        0.120123915 = fieldWeight in 7953, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          1.0872376 = idf(docFreq=40523, maxDocs=44218)
          0.078125 = fieldNorm(doc=7953)
  0.18181819 = coord(2/11)
    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
    Pages
    19 S
  3. Robertson, S.E.: OKAPI at TREC (1994) 0.00 
    3.156396E-4 = product of:
  0.0034720355 = sum of:
    0.0034720355 = weight(_text_:s in 7952) [ClassicSimilarity], result of:
      0.0034720355 = score(doc=7952,freq=2.0), product of:
        0.028903782 = queryWeight, product of:
          1.0872376 = idf(docFreq=40523, maxDocs=44218)
          0.026584605 = queryNorm
        0.120123915 = fieldWeight in 7952, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          1.0872376 = idf(docFreq=40523, maxDocs=44218)
          0.078125 = fieldNorm(doc=7952)
  0.09090909 = coord(1/11)
    Pages
    19 S

Themes