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Wilbur, W.J.: Global term weights for document retrieval learned from TREC data (2001) 0.01

0.006007989 = product of:
  0.024031956 = sum of:
    0.024031956 = weight(_text_:information in 2647) [ClassicSimilarity], result of:
      0.024031956 = score(doc=2647,freq=2.0), product of:
        0.08850355 = queryWeight, product of:
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.050415643 = queryNorm
        0.27153665 = fieldWeight in 2647, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          1.7554779 = idf(docFreq=20772, maxDocs=44218)
          0.109375 = fieldNorm(doc=2647)
  0.25 = coord(1/4)

Source: Journal of information science. 27(2001) no.5, S.303-310