Search (2 results, page 1 of 1)

  • × author_ss:"Walker, S."
  • × theme_ss:"OPAC"
  • × year_i:[1990 TO 2000}
  1. Walker, S.; DeVere, R.: Improving subject retrieval in online catalogues : T.2: Relevance feedback and query expansion (1990) 0.00
    1.624313E-4 = product of:
      0.006659684 = sum of:
        0.006659684 = product of:
          0.013319368 = sum of:
            0.013319368 = weight(_text_:4 in 1816) [ClassicSimilarity], result of:
              0.013319368 = score(doc=1816,freq=2.0), product of:
                0.04442393 = queryWeight, product of:
                  2.7136984 = idf(docFreq=7967, maxDocs=44218)
                  0.016370254 = queryNorm
                0.29982415 = fieldWeight in 1816, product of:
                  1.4142135 = tf(freq=2.0), with freq of:
                    2.0 = termFreq=2.0
                  2.7136984 = idf(docFreq=7967, maxDocs=44218)
                  0.078125 = fieldNorm(doc=1816)
          0.5 = coord(1/2)
      0.024390243 = coord(1/41)
    
    Content
    1. Introduction // 2. Query modification through relevance feedback // 3. System design & description 4. Evaluation // 5. Analysis & results // 6. Conclusions and recommendations
  2. Hancock-Beaulieu, M.; Walker, S.: ¬An evaluation of automatic query expansion in an online library catalogue (1992) 0.00
    1.13701906E-4 = product of:
      0.0046617785 = sum of:
        0.0046617785 = product of:
          0.009323557 = sum of:
            0.009323557 = weight(_text_:4 in 2731) [ClassicSimilarity], result of:
              0.009323557 = score(doc=2731,freq=2.0), product of:
                0.04442393 = queryWeight, product of:
                  2.7136984 = idf(docFreq=7967, maxDocs=44218)
                  0.016370254 = queryNorm
                0.2098769 = fieldWeight in 2731, product of:
                  1.4142135 = tf(freq=2.0), with freq of:
                    2.0 = termFreq=2.0
                  2.7136984 = idf(docFreq=7967, maxDocs=44218)
                  0.0546875 = fieldNorm(doc=2731)
          0.5 = coord(1/2)
      0.024390243 = coord(1/41)
    
    Source
    Journal of documentation. 48(1992) no.4, S.406-421