Document (#33343)

Author
Leydesdorff, L.
Title
On the normalization and visualization of author co-citation data : Salton's Cosine versus the Jaccard index
Source
Journal of the American Society for Information Science and Technology. 59(2008) no.1, S.77-85
Year
2008
Abstract
The debate about which similarity measure one should use for the normalization in the case of Author Co-citation Analysis (ACA) is further complicated when one distinguishes between the symmetrical co-citation - or, more generally, co-occurrence - matrix and the underlying asymmetrical citation - occurrence - matrix. In the Web environment, the approach of retrieving original citation data is often not feasible. In that case, one should use the Jaccard index, but preferentially after adding the number of total citations (i.e., occurrences) on the main diagonal. Unlike Salton's cosine and the Pearson correlation, the Jaccard index abstracts from the shape of the distributions and focuses only on the intersection and the sum of the two sets. Since the correlations in the co-occurrence matrix may be spurious, this property of the Jaccard index can be considered as an advantage in this case.
Theme
Informetrie
Citation indexing
Object
Salton's Cosine index
Jaccard index

Similar documents (author)

  1. Leydesdorff, L.: ¬The generation of aggregated journal-journal citation maps on the basis of the CD-ROM version of the Science Citation Index (1994) 4.51
    4.5085645 = sum of:
      4.5085645 = weight(author_txt:leydesdorff in 281) [ClassicSimilarity], result of:
        4.5085645 = fieldWeight in 281, product of:
          1.0 = tf(freq=1.0), with freq of:
            1.0 = termFreq=1.0
          7.213703 = idf(docFreq=83, maxDocs=41962)
          0.625 = fieldNorm(doc=281)
    
  2. Leydesdorff, L.: Why words and co-word cannot map the development of the science (1997) 4.51
    4.5085645 = sum of:
      4.5085645 = weight(author_txt:leydesdorff in 1561) [ClassicSimilarity], result of:
        4.5085645 = fieldWeight in 1561, product of:
          1.0 = tf(freq=1.0), with freq of:
            1.0 = termFreq=1.0
          7.213703 = idf(docFreq=83, maxDocs=41962)
          0.625 = fieldNorm(doc=1561)
    
  3. Leydesdorff, L.: Theories of citation? (1999) 4.51
    4.5085645 = sum of:
      4.5085645 = weight(author_txt:leydesdorff in 6544) [ClassicSimilarity], result of:
        4.5085645 = fieldWeight in 6544, product of:
          1.0 = tf(freq=1.0), with freq of:
            1.0 = termFreq=1.0
          7.213703 = idf(docFreq=83, maxDocs=41962)
          0.625 = fieldNorm(doc=6544)
    
  4. Leydesdorff, L.: ¬A sociological theory of communication : the self-organization of the knowledge-based society (2001) 4.51
    4.5085645 = sum of:
      4.5085645 = weight(author_txt:leydesdorff in 1185) [ClassicSimilarity], result of:
        4.5085645 = fieldWeight in 1185, product of:
          1.0 = tf(freq=1.0), with freq of:
            1.0 = termFreq=1.0
          7.213703 = idf(docFreq=83, maxDocs=41962)
          0.625 = fieldNorm(doc=1185)
    
  5. Leydesdorff, L.: Dynamic and evolutionary updates of classificatory schemes in scientific journal structures (2002) 4.51
    4.5085645 = sum of:
      4.5085645 = weight(author_txt:leydesdorff in 2250) [ClassicSimilarity], result of:
        4.5085645 = fieldWeight in 2250, product of:
          1.0 = tf(freq=1.0), with freq of:
            1.0 = termFreq=1.0
          7.213703 = idf(docFreq=83, maxDocs=41962)
          0.625 = fieldNorm(doc=2250)
    

Similar documents (content)

  1. Leydesdorff, L.; Vaughan, L.: Co-occurrence matrices and their applications in information science : extending ACA to the Web environment (2006) 0.44
    0.43665296 = sum of:
      0.43665296 = product of:
        1.0916324 = sum of:
          0.017931018 = weight(abstract_txt:data in 1114) [ClassicSimilarity], result of:
            0.017931018 = score(doc=1114,freq=4.0), product of:
              0.04222091 = queryWeight, product of:
                3.3975618 = idf(docFreq=3815, maxDocs=41962)
                0.012426826 = queryNorm
              0.42469522 = fieldWeight in 1114, product of:
                2.0 = tf(freq=4.0), with freq of:
                  4.0 = termFreq=4.0
                3.3975618 = idf(docFreq=3815, maxDocs=41962)
                0.0625 = fieldNorm(doc=1114)
          0.07394496 = weight(abstract_txt:pearson in 1114) [ClassicSimilarity], result of:
            0.07394496 = score(doc=1114,freq=1.0), product of:
              0.13679598 = queryWeight, product of:
                1.2727933 = boost
                8.6487875 = idf(docFreq=19, maxDocs=41962)
                0.012426826 = queryNorm
              0.5405492 = fieldWeight in 1114, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                8.6487875 = idf(docFreq=19, maxDocs=41962)
                0.0625 = fieldNorm(doc=1114)
          0.020403875 = weight(abstract_txt:should in 1114) [ClassicSimilarity], result of:
            0.020403875 = score(doc=1114,freq=1.0), product of:
              0.07304986 = queryWeight, product of:
                1.3153639 = boost
                4.46903 = idf(docFreq=1306, maxDocs=41962)
                0.012426826 = queryNorm
              0.27931437 = fieldWeight in 1114, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                4.46903 = idf(docFreq=1306, maxDocs=41962)
                0.0625 = fieldNorm(doc=1114)
          0.14746408 = weight(abstract_txt:symmetrical in 1114) [ClassicSimilarity], result of:
            0.14746408 = score(doc=1114,freq=2.0), product of:
              0.17202112 = queryWeight, product of:
                1.4272896 = boost
                9.698609 = idf(docFreq=6, maxDocs=41962)
                0.012426826 = queryNorm
              0.857244 = fieldWeight in 1114, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                9.698609 = idf(docFreq=6, maxDocs=41962)
                0.0625 = fieldNorm(doc=1114)
          0.15460788 = weight(abstract_txt:asymmetrical in 1114) [ClassicSimilarity], result of:
            0.15460788 = score(doc=1114,freq=2.0), product of:
              0.17753284 = queryWeight, product of:
                1.4499751 = boost
                9.85276 = idf(docFreq=5, maxDocs=41962)
                0.012426826 = queryNorm
              0.87086916 = fieldWeight in 1114, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                9.85276 = idf(docFreq=5, maxDocs=41962)
                0.0625 = fieldNorm(doc=1114)
          0.10652014 = weight(abstract_txt:cosine in 1114) [ClassicSimilarity], result of:
            0.10652014 = score(doc=1114,freq=1.0), product of:
              0.21983597 = queryWeight, product of:
                2.281842 = boost
                7.7526994 = idf(docFreq=48, maxDocs=41962)
                0.012426826 = queryNorm
              0.4845437 = fieldWeight in 1114, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                7.7526994 = idf(docFreq=48, maxDocs=41962)
                0.0625 = fieldNorm(doc=1114)
          0.0484674 = weight(abstract_txt:index in 1114) [ClassicSimilarity], result of:
            0.0484674 = score(doc=1114,freq=1.0), product of:
              0.16385289 = queryWeight, product of:
                2.7859817 = boost
                4.7327724 = idf(docFreq=1003, maxDocs=41962)
                0.012426826 = queryNorm
              0.29579827 = fieldWeight in 1114, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                4.7327724 = idf(docFreq=1003, maxDocs=41962)
                0.0625 = fieldNorm(doc=1114)
          0.15303236 = weight(abstract_txt:occurrence in 1114) [ClassicSimilarity], result of:
            0.15303236 = score(doc=1114,freq=2.0), product of:
              0.2543042 = queryWeight, product of:
                3.0057898 = boost
                6.808238 = idf(docFreq=125, maxDocs=41962)
                0.012426826 = queryNorm
              0.6017689 = fieldWeight in 1114, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                6.808238 = idf(docFreq=125, maxDocs=41962)
                0.0625 = fieldNorm(doc=1114)
          0.25088957 = weight(abstract_txt:matrix in 1114) [ClassicSimilarity], result of:
            0.25088957 = score(doc=1114,freq=5.0), product of:
              0.2605192 = queryWeight, product of:
                3.0422976 = boost
                6.8909297 = idf(docFreq=115, maxDocs=41962)
                0.012426826 = queryNorm
              0.9630367 = fieldWeight in 1114, product of:
                2.236068 = tf(freq=5.0), with freq of:
                  5.0 = termFreq=5.0
                6.8909297 = idf(docFreq=115, maxDocs=41962)
                0.0625 = fieldNorm(doc=1114)
          0.11837114 = weight(abstract_txt:citation in 1114) [ClassicSimilarity], result of:
            0.11837114 = score(doc=1114,freq=3.0), product of:
              0.22194621 = queryWeight, product of:
                3.6251843 = boost
                4.926715 = idf(docFreq=826, maxDocs=41962)
                0.012426826 = queryNorm
              0.5333325 = fieldWeight in 1114, product of:
                1.7320508 = tf(freq=3.0), with freq of:
                  3.0 = termFreq=3.0
                4.926715 = idf(docFreq=826, maxDocs=41962)
                0.0625 = fieldNorm(doc=1114)
        0.4 = coord(10/25)
    
  2. Egghe, L.; Leydesdorff, L.: ¬The relation between Pearson's correlation coefficient r and Salton's cosine measure (2009) 0.35
    0.3532201 = sum of:
      0.3532201 = product of:
        1.1038128 = sum of:
          0.05955768 = weight(abstract_txt:correlations in 4804) [ClassicSimilarity], result of:
            0.05955768 = score(doc=4804,freq=1.0), product of:
              0.10205151 = queryWeight, product of:
                1.0993372 = boost
                7.4701324 = idf(docFreq=64, maxDocs=41962)
                0.012426826 = queryNorm
              0.5836041 = fieldWeight in 4804, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                7.4701324 = idf(docFreq=64, maxDocs=41962)
                0.078125 = fieldNorm(doc=4804)
          0.0924312 = weight(abstract_txt:pearson in 4804) [ClassicSimilarity], result of:
            0.0924312 = score(doc=4804,freq=1.0), product of:
              0.13679598 = queryWeight, product of:
                1.2727933 = boost
                8.6487875 = idf(docFreq=19, maxDocs=41962)
                0.012426826 = queryNorm
              0.67568654 = fieldWeight in 4804, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                8.6487875 = idf(docFreq=19, maxDocs=41962)
                0.078125 = fieldNorm(doc=4804)
          0.035790045 = weight(abstract_txt:author in 4804) [ClassicSimilarity], result of:
            0.035790045 = score(doc=4804,freq=1.0), product of:
              0.0915614 = queryWeight, product of:
                1.4726259 = boost
                5.0033374 = idf(docFreq=765, maxDocs=41962)
                0.012426826 = queryNorm
              0.39088574 = fieldWeight in 4804, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.0033374 = idf(docFreq=765, maxDocs=41962)
                0.078125 = fieldNorm(doc=4804)
          0.18830277 = weight(abstract_txt:cosine in 4804) [ClassicSimilarity], result of:
            0.18830277 = score(doc=4804,freq=2.0), product of:
              0.21983597 = queryWeight, product of:
                2.281842 = boost
                7.7526994 = idf(docFreq=48, maxDocs=41962)
                0.012426826 = queryNorm
              0.85656035 = fieldWeight in 4804, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                7.7526994 = idf(docFreq=48, maxDocs=41962)
                0.078125 = fieldNorm(doc=4804)
          0.2733107 = weight(abstract_txt:salton's in 4804) [ClassicSimilarity], result of:
            0.2733107 = score(doc=4804,freq=1.0), product of:
              0.35506567 = queryWeight, product of:
                2.8999503 = boost
                9.85276 = idf(docFreq=5, maxDocs=41962)
                0.012426826 = queryNorm
              0.7697469 = fieldWeight in 4804, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                9.85276 = idf(docFreq=5, maxDocs=41962)
                0.078125 = fieldNorm(doc=4804)
          0.13526277 = weight(abstract_txt:occurrence in 4804) [ClassicSimilarity], result of:
            0.13526277 = score(doc=4804,freq=1.0), product of:
              0.2543042 = queryWeight, product of:
                3.0057898 = boost
                6.808238 = idf(docFreq=125, maxDocs=41962)
                0.012426826 = queryNorm
              0.5318936 = fieldWeight in 4804, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                6.808238 = idf(docFreq=125, maxDocs=41962)
                0.078125 = fieldNorm(doc=4804)
          0.1983456 = weight(abstract_txt:matrix in 4804) [ClassicSimilarity], result of:
            0.1983456 = score(doc=4804,freq=2.0), product of:
              0.2605192 = queryWeight, product of:
                3.0422976 = boost
                6.8909297 = idf(docFreq=115, maxDocs=41962)
                0.012426826 = queryNorm
              0.76134735 = fieldWeight in 4804, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                6.8909297 = idf(docFreq=115, maxDocs=41962)
                0.078125 = fieldNorm(doc=4804)
          0.120812036 = weight(abstract_txt:citation in 4804) [ClassicSimilarity], result of:
            0.120812036 = score(doc=4804,freq=2.0), product of:
              0.22194621 = queryWeight, product of:
                3.6251843 = boost
                4.926715 = idf(docFreq=826, maxDocs=41962)
                0.012426826 = queryNorm
              0.54433024 = fieldWeight in 4804, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                4.926715 = idf(docFreq=826, maxDocs=41962)
                0.078125 = fieldNorm(doc=4804)
        0.32 = coord(8/25)
    
  3. Zhou, Q.; Leydesdorff, L.: ¬The normalization of occurrence and co-occurrence matrices in bibliometrics using Cosine similarities and Ochiai coefficients (2016) 0.33
    0.3294757 = sum of:
      0.3294757 = product of:
        1.1766989 = sum of:
          0.0924312 = weight(abstract_txt:pearson in 162) [ClassicSimilarity], result of:
            0.0924312 = score(doc=162,freq=1.0), product of:
              0.13679598 = queryWeight, product of:
                1.2727933 = boost
                8.6487875 = idf(docFreq=19, maxDocs=41962)
                0.012426826 = queryNorm
              0.67568654 = fieldWeight in 162, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                8.6487875 = idf(docFreq=19, maxDocs=41962)
                0.078125 = fieldNorm(doc=162)
          0.025504844 = weight(abstract_txt:should in 162) [ClassicSimilarity], result of:
            0.025504844 = score(doc=162,freq=1.0), product of:
              0.07304986 = queryWeight, product of:
                1.3153639 = boost
                4.46903 = idf(docFreq=1306, maxDocs=41962)
                0.012426826 = queryNorm
              0.34914297 = fieldWeight in 162, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                4.46903 = idf(docFreq=1306, maxDocs=41962)
                0.078125 = fieldNorm(doc=162)
          0.035790045 = weight(abstract_txt:author in 162) [ClassicSimilarity], result of:
            0.035790045 = score(doc=162,freq=1.0), product of:
              0.0915614 = queryWeight, product of:
                1.4726259 = boost
                5.0033374 = idf(docFreq=765, maxDocs=41962)
                0.012426826 = queryNorm
              0.39088574 = fieldWeight in 162, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.0033374 = idf(docFreq=765, maxDocs=41962)
                0.078125 = fieldNorm(doc=162)
          0.17628121 = weight(abstract_txt:normalization in 162) [ClassicSimilarity], result of:
            0.17628121 = score(doc=162,freq=2.0), product of:
              0.21037702 = queryWeight, product of:
                2.2322116 = boost
                7.584077 = idf(docFreq=57, maxDocs=41962)
                0.012426826 = queryNorm
              0.83792996 = fieldWeight in 162, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                7.584077 = idf(docFreq=57, maxDocs=41962)
                0.078125 = fieldNorm(doc=162)
          0.23062284 = weight(abstract_txt:cosine in 162) [ClassicSimilarity], result of:
            0.23062284 = score(doc=162,freq=3.0), product of:
              0.21983597 = queryWeight, product of:
                2.281842 = boost
                7.7526994 = idf(docFreq=48, maxDocs=41962)
                0.012426826 = queryNorm
              1.0490679 = fieldWeight in 162, product of:
                1.7320508 = tf(freq=3.0), with freq of:
                  3.0 = termFreq=3.0
                7.7526994 = idf(docFreq=48, maxDocs=41962)
                0.078125 = fieldNorm(doc=162)
          0.30245677 = weight(abstract_txt:occurrence in 162) [ClassicSimilarity], result of:
            0.30245677 = score(doc=162,freq=5.0), product of:
              0.2543042 = queryWeight, product of:
                3.0057898 = boost
                6.808238 = idf(docFreq=125, maxDocs=41962)
                0.012426826 = queryNorm
              1.1893502 = fieldWeight in 162, product of:
                2.236068 = tf(freq=5.0), with freq of:
                  5.0 = termFreq=5.0
                6.808238 = idf(docFreq=125, maxDocs=41962)
                0.078125 = fieldNorm(doc=162)
          0.31361195 = weight(abstract_txt:matrix in 162) [ClassicSimilarity], result of:
            0.31361195 = score(doc=162,freq=5.0), product of:
              0.2605192 = queryWeight, product of:
                3.0422976 = boost
                6.8909297 = idf(docFreq=115, maxDocs=41962)
                0.012426826 = queryNorm
              1.2037959 = fieldWeight in 162, product of:
                2.236068 = tf(freq=5.0), with freq of:
                  5.0 = termFreq=5.0
                6.8909297 = idf(docFreq=115, maxDocs=41962)
                0.078125 = fieldNorm(doc=162)
        0.28 = coord(7/25)
    
  4. Egghe, L.: New relations between similarity measures for vectors based on vector norms (2009) 0.23
    0.23344272 = sum of:
      0.23344272 = product of:
        1.459017 = sum of:
          0.069294706 = weight(abstract_txt:case in 4709) [ClassicSimilarity], result of:
            0.069294706 = score(doc=4709,freq=2.0), product of:
              0.12922843 = queryWeight, product of:
                2.1426976 = boost
                4.853298 = idf(docFreq=889, maxDocs=41962)
                0.012426826 = queryNorm
              0.53621876 = fieldWeight in 4709, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                4.853298 = idf(docFreq=889, maxDocs=41962)
                0.078125 = fieldNorm(doc=4709)
          0.26630032 = weight(abstract_txt:cosine in 4709) [ClassicSimilarity], result of:
            0.26630032 = score(doc=4709,freq=4.0), product of:
              0.21983597 = queryWeight, product of:
                2.281842 = boost
                7.7526994 = idf(docFreq=48, maxDocs=41962)
                0.012426826 = queryNorm
              1.2113593 = fieldWeight in 4709, product of:
                2.0 = tf(freq=4.0), with freq of:
                  4.0 = termFreq=4.0
                7.7526994 = idf(docFreq=48, maxDocs=41962)
                0.078125 = fieldNorm(doc=4709)
          0.5466214 = weight(abstract_txt:salton's in 4709) [ClassicSimilarity], result of:
            0.5466214 = score(doc=4709,freq=4.0), product of:
              0.35506567 = queryWeight, product of:
                2.8999503 = boost
                9.85276 = idf(docFreq=5, maxDocs=41962)
                0.012426826 = queryNorm
              1.5394938 = fieldWeight in 4709, product of:
                2.0 = tf(freq=4.0), with freq of:
                  4.0 = termFreq=4.0
                9.85276 = idf(docFreq=5, maxDocs=41962)
                0.078125 = fieldNorm(doc=4709)
          0.5768007 = weight(abstract_txt:jaccard in 4709) [ClassicSimilarity], result of:
            0.5768007 = score(doc=4709,freq=2.0), product of:
              0.5841909 = queryWeight, product of:
                5.260519 = boost
                8.936469 = idf(docFreq=14, maxDocs=41962)
                0.012426826 = queryNorm
              0.9873497 = fieldWeight in 4709, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                8.936469 = idf(docFreq=14, maxDocs=41962)
                0.078125 = fieldNorm(doc=4709)
        0.16 = coord(4/25)
    
  5. Eck, N.J. van; Waltman, L.: How to normalize cooccurrence data? : an analysis of some well-known similarity measures (2009) 0.21
    0.2066671 = sum of:
      0.2066671 = product of:
        1.0333354 = sum of:
          0.022413772 = weight(abstract_txt:data in 108) [ClassicSimilarity], result of:
            0.022413772 = score(doc=108,freq=4.0), product of:
              0.04222091 = queryWeight, product of:
                3.3975618 = idf(docFreq=3815, maxDocs=41962)
                0.012426826 = queryNorm
              0.530869 = fieldWeight in 108, product of:
                2.0 = tf(freq=4.0), with freq of:
                  4.0 = termFreq=4.0
                3.3975618 = idf(docFreq=3815, maxDocs=41962)
                0.078125 = fieldNorm(doc=108)
          0.124649644 = weight(abstract_txt:normalization in 108) [ClassicSimilarity], result of:
            0.124649644 = score(doc=108,freq=1.0), product of:
              0.21037702 = queryWeight, product of:
                2.2322116 = boost
                7.584077 = idf(docFreq=57, maxDocs=41962)
                0.012426826 = queryNorm
              0.592506 = fieldWeight in 108, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                7.584077 = idf(docFreq=57, maxDocs=41962)
                0.078125 = fieldNorm(doc=108)
          0.18830277 = weight(abstract_txt:cosine in 108) [ClassicSimilarity], result of:
            0.18830277 = score(doc=108,freq=2.0), product of:
              0.21983597 = queryWeight, product of:
                2.281842 = boost
                7.7526994 = idf(docFreq=48, maxDocs=41962)
                0.012426826 = queryNorm
              0.85656035 = fieldWeight in 108, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                7.7526994 = idf(docFreq=48, maxDocs=41962)
                0.078125 = fieldNorm(doc=108)
          0.1211685 = weight(abstract_txt:index in 108) [ClassicSimilarity], result of:
            0.1211685 = score(doc=108,freq=4.0), product of:
              0.16385289 = queryWeight, product of:
                2.7859817 = boost
                4.7327724 = idf(docFreq=1003, maxDocs=41962)
                0.012426826 = queryNorm
              0.7394957 = fieldWeight in 108, product of:
                2.0 = tf(freq=4.0), with freq of:
                  4.0 = termFreq=4.0
                4.7327724 = idf(docFreq=1003, maxDocs=41962)
                0.078125 = fieldNorm(doc=108)
          0.5768007 = weight(abstract_txt:jaccard in 108) [ClassicSimilarity], result of:
            0.5768007 = score(doc=108,freq=2.0), product of:
              0.5841909 = queryWeight, product of:
                5.260519 = boost
                8.936469 = idf(docFreq=14, maxDocs=41962)
                0.012426826 = queryNorm
              0.9873497 = fieldWeight in 108, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                8.936469 = idf(docFreq=14, maxDocs=41962)
                0.078125 = fieldNorm(doc=108)
        0.2 = coord(5/25)