Search (3 results, page 1 of 1)

0.011485667 = product of:
  0.045942668 = sum of:
    0.045942668 = weight(_text_:library in 2409) [ClassicSimilarity], result of:
      0.045942668 = score(doc=2409,freq=2.0), product of:
        0.1317883 = queryWeight, product of:
          2.6293786 = idf(docFreq=8668, maxDocs=44218)
          0.050121464 = queryNorm
        0.34860963 = fieldWeight in 2409, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          2.6293786 = idf(docFreq=8668, maxDocs=44218)
          0.09375 = fieldNorm(doc=2409)
  0.25 = coord(1/4)

Source

Library classification and its functions. Int. Conf. on ..., 20.-21.6.1989, Edmonton, Alberta. Ed.: A. Nitecki u. T. Fell

0.0076571116 = product of:
  0.030628446 = sum of:
    0.030628446 = weight(_text_:library in 3879) [ClassicSimilarity], result of:
      0.030628446 = score(doc=3879,freq=2.0), product of:
        0.1317883 = queryWeight, product of:
          2.6293786 = idf(docFreq=8668, maxDocs=44218)
          0.050121464 = queryNorm
        0.23240642 = fieldWeight in 3879, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          2.6293786 = idf(docFreq=8668, maxDocs=44218)
          0.0625 = fieldNorm(doc=3879)
  0.25 = coord(1/4)

Source

Encyclopedia of library and information sciences. 3rd ed. Ed.: M.J. Bates

0.0073997467 = product of:
  0.029598987 = sum of:
    0.029598987 = product of:
      0.059197973 = sum of:
        0.059197973 = weight(_text_:project in 5699) [ClassicSimilarity], result of:
          0.059197973 = score(doc=5699,freq=2.0), product of:
            0.21156175 = queryWeight, product of:
              4.220981 = idf(docFreq=1764, maxDocs=44218)
              0.050121464 = queryNorm
            0.27981415 = fieldWeight in 5699, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              4.220981 = idf(docFreq=1764, maxDocs=44218)
              0.046875 = fieldNorm(doc=5699)
      0.5 = coord(1/2)
  0.25 = coord(1/4)

Abstract

The Smart information retrieval project emphazises completely automatic approaches to the understanding and retrieval of large quantities of text. The work in the TREC-2 environment continues, performing both routing and ad hoc experiments. The ad hoc work extends investigations into combining global similarities, giving an overall indication of how a document matches a query, with local similarities identifying a smaller part of the document that matches the query. The performance of ad hoc runs is good, but it is clear that full advantage of the available local information is not been taken advantage of. The routing experiments use conventional relevance feedback approaches to routing, but with a much greater degree of query expansion than was previously done. The length of a query vector is increased by a factor of 5 to 10 by adding terms found in previously seen relevant documents. This approach improves effectiveness by 30-40% over the original query