Document (#40766)

Author
Orduna-Malea, E.
Thelwall, M.
Kousha, K.
Title
Web citations in patents : evidence of technological impact?
Source
Journal of the Association for Information Science and Technology. 68(2017) no.8, S.1967-1974
Year
2017
Abstract
Patents sometimes cite webpages either as general background to the problem being addressed or to identify prior publications that limit the scope of the patent granted. Counts of the number of patents citing an organization's website may therefore provide an indicator of its technological capacity or relevance. This article introduces methods to extract URL citations from patents and evaluates the usefulness of counts of patent web citations as a technology indicator. An analysis of patents citing 200 US universities or 177 UK universities found computer science and engineering departments to be frequently cited, as well as research-related webpages, such as Wikipedia, YouTube, or the Internet Archive. Overall, however, patent URL citations seem to be frequent enough to be useful for ranking major US and the top few UK universities if popular hosted subdomains are filtered out, but the hit count estimates on the first search engine results page should not be relied upon for accuracy.
Content
Vgl.: http://onlinelibrary.wiley.com/doi/10.1002/asi.23821/full.
Theme
Informetrie
Field
Patentinformation

Similar documents (author)

  1. Kousha, K.; Thelwall, M.: Google Scholar citations and Google Web/URL citations : a multi-discipline exploratory analysis (2007) 2.44
    2.4440815 = sum of:
      2.4440815 = product of:
        3.6661222 = sum of:
          1.3046944 = weight(author_txt:thelwall in 2338) [ClassicSimilarity], result of:
            1.3046944 = score(doc=2338,freq=1.0), product of:
              0.37606597 = queryWeight, product of:
                6.9386463 = idf(docFreq=113, maxDocs=43254)
                0.054198753 = queryNorm
              3.4693232 = fieldWeight in 2338, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                6.9386463 = idf(docFreq=113, maxDocs=43254)
                0.5 = fieldNorm(doc=2338)
          2.3614278 = weight(author_txt:kousha in 2338) [ClassicSimilarity], result of:
            2.3614278 = score(doc=2338,freq=1.0), product of:
              0.5585233 = queryWeight, product of:
                1.218677 = boost
                8.455969 = idf(docFreq=24, maxDocs=43254)
                0.054198753 = queryNorm
              4.2279844 = fieldWeight in 2338, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                8.455969 = idf(docFreq=24, maxDocs=43254)
                0.5 = fieldNorm(doc=2338)
        0.6666667 = coord(2/3)
    
  2. Kousha, K.; Thelwall, M.: How is science cited on the Web? : a classification of google unique Web citations (2007) 2.44
    2.4440815 = sum of:
      2.4440815 = product of:
        3.6661222 = sum of:
          1.3046944 = weight(author_txt:thelwall in 2587) [ClassicSimilarity], result of:
            1.3046944 = score(doc=2587,freq=1.0), product of:
              0.37606597 = queryWeight, product of:
                6.9386463 = idf(docFreq=113, maxDocs=43254)
                0.054198753 = queryNorm
              3.4693232 = fieldWeight in 2587, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                6.9386463 = idf(docFreq=113, maxDocs=43254)
                0.5 = fieldNorm(doc=2587)
          2.3614278 = weight(author_txt:kousha in 2587) [ClassicSimilarity], result of:
            2.3614278 = score(doc=2587,freq=1.0), product of:
              0.5585233 = queryWeight, product of:
                1.218677 = boost
                8.455969 = idf(docFreq=24, maxDocs=43254)
                0.054198753 = queryNorm
              4.2279844 = fieldWeight in 2587, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                8.455969 = idf(docFreq=24, maxDocs=43254)
                0.5 = fieldNorm(doc=2587)
        0.6666667 = coord(2/3)
    
  3. Thelwall, M.; Kousha, K.: Online presentations as a source of scientific impact? : an analysis of PowerPoint files citing academic journals (2008) 2.44
    2.4440815 = sum of:
      2.4440815 = product of:
        3.6661222 = sum of:
          1.3046944 = weight(author_txt:thelwall in 3615) [ClassicSimilarity], result of:
            1.3046944 = score(doc=3615,freq=1.0), product of:
              0.37606597 = queryWeight, product of:
                6.9386463 = idf(docFreq=113, maxDocs=43254)
                0.054198753 = queryNorm
              3.4693232 = fieldWeight in 3615, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                6.9386463 = idf(docFreq=113, maxDocs=43254)
                0.5 = fieldNorm(doc=3615)
          2.3614278 = weight(author_txt:kousha in 3615) [ClassicSimilarity], result of:
            2.3614278 = score(doc=3615,freq=1.0), product of:
              0.5585233 = queryWeight, product of:
                1.218677 = boost
                8.455969 = idf(docFreq=24, maxDocs=43254)
                0.054198753 = queryNorm
              4.2279844 = fieldWeight in 3615, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                8.455969 = idf(docFreq=24, maxDocs=43254)
                0.5 = fieldNorm(doc=3615)
        0.6666667 = coord(2/3)
    
  4. Kousha, K.; Thelwall, M.: Assessing the impact of disciplinary research on teaching : an automatic analysis of online syllabuses (2008) 2.44
    2.4440815 = sum of:
      2.4440815 = product of:
        3.6661222 = sum of:
          1.3046944 = weight(author_txt:thelwall in 4384) [ClassicSimilarity], result of:
            1.3046944 = score(doc=4384,freq=1.0), product of:
              0.37606597 = queryWeight, product of:
                6.9386463 = idf(docFreq=113, maxDocs=43254)
                0.054198753 = queryNorm
              3.4693232 = fieldWeight in 4384, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                6.9386463 = idf(docFreq=113, maxDocs=43254)
                0.5 = fieldNorm(doc=4384)
          2.3614278 = weight(author_txt:kousha in 4384) [ClassicSimilarity], result of:
            2.3614278 = score(doc=4384,freq=1.0), product of:
              0.5585233 = queryWeight, product of:
                1.218677 = boost
                8.455969 = idf(docFreq=24, maxDocs=43254)
                0.054198753 = queryNorm
              4.2279844 = fieldWeight in 4384, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                8.455969 = idf(docFreq=24, maxDocs=43254)
                0.5 = fieldNorm(doc=4384)
        0.6666667 = coord(2/3)
    
  5. Kousha, K.; Thelwall, M.: Google book search : citation analysis for social science and the humanities (2009) 2.44
    2.4440815 = sum of:
      2.4440815 = product of:
        3.6661222 = sum of:
          1.3046944 = weight(author_txt:thelwall in 4947) [ClassicSimilarity], result of:
            1.3046944 = score(doc=4947,freq=1.0), product of:
              0.37606597 = queryWeight, product of:
                6.9386463 = idf(docFreq=113, maxDocs=43254)
                0.054198753 = queryNorm
              3.4693232 = fieldWeight in 4947, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                6.9386463 = idf(docFreq=113, maxDocs=43254)
                0.5 = fieldNorm(doc=4947)
          2.3614278 = weight(author_txt:kousha in 4947) [ClassicSimilarity], result of:
            2.3614278 = score(doc=4947,freq=1.0), product of:
              0.5585233 = queryWeight, product of:
                1.218677 = boost
                8.455969 = idf(docFreq=24, maxDocs=43254)
                0.054198753 = queryNorm
              4.2279844 = fieldWeight in 4947, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                8.455969 = idf(docFreq=24, maxDocs=43254)
                0.5 = fieldNorm(doc=4947)
        0.6666667 = coord(2/3)
    

Similar documents (content)

  1. Guan, J.C.; Gao, X.: Exploring the h-index at patent level (2009) 0.37
    0.36507973 = sum of:
      0.36507973 = product of:
        1.3038561 = sum of:
          0.06928414 = weight(abstract_txt:granted in 4697) [ClassicSimilarity], result of:
            0.06928414 = score(doc=4697,freq=1.0), product of:
              0.13604325 = queryWeight, product of:
                1.2239436 = boost
                8.148484 = idf(docFreq=33, maxDocs=43254)
                0.013640767 = queryNorm
              0.50928026 = fieldWeight in 4697, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                8.148484 = idf(docFreq=33, maxDocs=43254)
                0.0625 = fieldNorm(doc=4697)
          0.046287067 = weight(abstract_txt:technological in 4697) [ClassicSimilarity], result of:
            0.046287067 = score(doc=4697,freq=1.0), product of:
              0.13098982 = queryWeight, product of:
                1.6984652 = boost
                5.6538215 = idf(docFreq=411, maxDocs=43254)
                0.013640767 = queryNorm
              0.35336384 = fieldWeight in 4697, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.6538215 = idf(docFreq=411, maxDocs=43254)
                0.0625 = fieldNorm(doc=4697)
          0.10784897 = weight(abstract_txt:counts in 4697) [ClassicSimilarity], result of:
            0.10784897 = score(doc=4697,freq=2.0), product of:
              0.1827252 = queryWeight, product of:
                2.0060287 = boost
                6.677633 = idf(docFreq=147, maxDocs=43254)
                0.013640767 = queryNorm
              0.5902249 = fieldWeight in 4697, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                6.677633 = idf(docFreq=147, maxDocs=43254)
                0.0625 = fieldNorm(doc=4697)
          0.1154346 = weight(abstract_txt:indicator in 4697) [ClassicSimilarity], result of:
            0.1154346 = score(doc=4697,freq=2.0), product of:
              0.19119585 = queryWeight, product of:
                2.0519989 = boost
                6.830658 = idf(docFreq=126, maxDocs=43254)
                0.013640767 = queryNorm
              0.6037506 = fieldWeight in 4697, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                6.830658 = idf(docFreq=126, maxDocs=43254)
                0.0625 = fieldNorm(doc=4697)
          0.358928 = weight(abstract_txt:patent in 4697) [ClassicSimilarity], result of:
            0.358928 = score(doc=4697,freq=8.0), product of:
              0.29372197 = queryWeight, product of:
                3.1149547 = boost
                6.912671 = idf(docFreq=116, maxDocs=43254)
                0.013640767 = queryNorm
              1.2219992 = fieldWeight in 4697, product of:
                2.828427 = tf(freq=8.0), with freq of:
                  8.0 = termFreq=8.0
                6.912671 = idf(docFreq=116, maxDocs=43254)
                0.0625 = fieldNorm(doc=4697)
          0.07853799 = weight(abstract_txt:citations in 4697) [ClassicSimilarity], result of:
            0.07853799 = score(doc=4697,freq=1.0), product of:
              0.23477994 = queryWeight, product of:
                3.215758 = boost
                5.3522797 = idf(docFreq=556, maxDocs=43254)
                0.013640767 = queryNorm
              0.33451748 = fieldWeight in 4697, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.3522797 = idf(docFreq=556, maxDocs=43254)
                0.0625 = fieldNorm(doc=4697)
          0.5275353 = weight(abstract_txt:patents in 4697) [ClassicSimilarity], result of:
            0.5275353 = score(doc=4697,freq=4.0), product of:
              0.567186 = queryWeight, product of:
                5.5881834 = boost
                7.4407387 = idf(docFreq=68, maxDocs=43254)
                0.013640767 = queryNorm
              0.93009233 = fieldWeight in 4697, product of:
                2.0 = tf(freq=4.0), with freq of:
                  4.0 = termFreq=4.0
                7.4407387 = idf(docFreq=68, maxDocs=43254)
                0.0625 = fieldNorm(doc=4697)
        0.28 = coord(7/25)
    
  2. Karki, M.M.S.: Patent citation analysis : a policy analysis tool (1997) 0.24
    0.24232362 = sum of:
      0.24232362 = product of:
        1.5145227 = sum of:
          0.08100237 = weight(abstract_txt:technological in 4077) [ClassicSimilarity], result of:
            0.08100237 = score(doc=4077,freq=1.0), product of:
              0.13098982 = queryWeight, product of:
                1.6984652 = boost
                5.6538215 = idf(docFreq=411, maxDocs=43254)
                0.013640767 = queryNorm
              0.61838675 = fieldWeight in 4077, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.6538215 = idf(docFreq=411, maxDocs=43254)
                0.109375 = fieldNorm(doc=4077)
          0.49657565 = weight(abstract_txt:patent in 4077) [ClassicSimilarity], result of:
            0.49657565 = score(doc=4077,freq=5.0), product of:
              0.29372197 = queryWeight, product of:
                3.1149547 = boost
                6.912671 = idf(docFreq=116, maxDocs=43254)
                0.013640767 = queryNorm
              1.6906316 = fieldWeight in 4077, product of:
                2.236068 = tf(freq=5.0), with freq of:
                  5.0 = termFreq=5.0
                6.912671 = idf(docFreq=116, maxDocs=43254)
                0.109375 = fieldNorm(doc=4077)
          0.13744149 = weight(abstract_txt:citations in 4077) [ClassicSimilarity], result of:
            0.13744149 = score(doc=4077,freq=1.0), product of:
              0.23477994 = queryWeight, product of:
                3.215758 = boost
                5.3522797 = idf(docFreq=556, maxDocs=43254)
                0.013640767 = queryNorm
              0.5854056 = fieldWeight in 4077, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.3522797 = idf(docFreq=556, maxDocs=43254)
                0.109375 = fieldNorm(doc=4077)
          0.7995032 = weight(abstract_txt:patents in 4077) [ClassicSimilarity], result of:
            0.7995032 = score(doc=4077,freq=3.0), product of:
              0.567186 = queryWeight, product of:
                5.5881834 = boost
                7.4407387 = idf(docFreq=68, maxDocs=43254)
                0.013640767 = queryNorm
              1.4095962 = fieldWeight in 4077, product of:
                1.7320508 = tf(freq=3.0), with freq of:
                  3.0 = termFreq=3.0
                7.4407387 = idf(docFreq=68, maxDocs=43254)
                0.109375 = fieldNorm(doc=4077)
        0.16 = coord(4/25)
    
  3. Azagra-Caro, J.M.; Mattsson, P.; Perruchas, F.: Smoothing the lies : the distinctive effects of patent characteristics on examiner and applicant citations (2011) 0.22
    0.2158132 = sum of:
      0.2158132 = product of:
        1.079066 = sum of:
          0.059126962 = weight(abstract_txt:cite in 1212) [ClassicSimilarity], result of:
            0.059126962 = score(doc=1212,freq=1.0), product of:
              0.105480336 = queryWeight, product of:
                1.0777267 = boost
                7.1750355 = idf(docFreq=89, maxDocs=43254)
                0.013640767 = queryNorm
              0.5605496 = fieldWeight in 1212, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                7.1750355 = idf(docFreq=89, maxDocs=43254)
                0.078125 = fieldNorm(doc=1212)
          0.057858832 = weight(abstract_txt:technological in 1212) [ClassicSimilarity], result of:
            0.057858832 = score(doc=1212,freq=1.0), product of:
              0.13098982 = queryWeight, product of:
                1.6984652 = boost
                5.6538215 = idf(docFreq=411, maxDocs=43254)
                0.013640767 = queryNorm
              0.4417048 = fieldWeight in 1212, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.6538215 = idf(docFreq=411, maxDocs=43254)
                0.078125 = fieldNorm(doc=1212)
          0.35469687 = weight(abstract_txt:patent in 1212) [ClassicSimilarity], result of:
            0.35469687 = score(doc=1212,freq=5.0), product of:
              0.29372197 = queryWeight, product of:
                3.1149547 = boost
                6.912671 = idf(docFreq=116, maxDocs=43254)
                0.013640767 = queryNorm
              1.2075939 = fieldWeight in 1212, product of:
                2.236068 = tf(freq=5.0), with freq of:
                  5.0 = termFreq=5.0
                6.912671 = idf(docFreq=116, maxDocs=43254)
                0.078125 = fieldNorm(doc=1212)
          0.27767375 = weight(abstract_txt:citations in 1212) [ClassicSimilarity], result of:
            0.27767375 = score(doc=1212,freq=8.0), product of:
              0.23477994 = queryWeight, product of:
                3.215758 = boost
                5.3522797 = idf(docFreq=556, maxDocs=43254)
                0.013640767 = queryNorm
              1.1826979 = fieldWeight in 1212, product of:
                2.828427 = tf(freq=8.0), with freq of:
                  8.0 = termFreq=8.0
                5.3522797 = idf(docFreq=556, maxDocs=43254)
                0.078125 = fieldNorm(doc=1212)
          0.3297096 = weight(abstract_txt:patents in 1212) [ClassicSimilarity], result of:
            0.3297096 = score(doc=1212,freq=1.0), product of:
              0.567186 = queryWeight, product of:
                5.5881834 = boost
                7.4407387 = idf(docFreq=68, maxDocs=43254)
                0.013640767 = queryNorm
              0.5813077 = fieldWeight in 1212, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                7.4407387 = idf(docFreq=68, maxDocs=43254)
                0.078125 = fieldNorm(doc=1212)
        0.2 = coord(5/25)
    
  4. Lawson, M.: Automatic extraction of citations from the text of English-language patents : an example of template mining (1996) 0.21
    0.21197012 = sum of:
      0.21197012 = product of:
        1.0598506 = sum of:
          0.039090246 = weight(abstract_txt:evaluates in 4655) [ClassicSimilarity], result of:
            0.039090246 = score(doc=4655,freq=1.0), product of:
              0.09288952 = queryWeight, product of:
                1.0113611 = boost
                6.7332025 = idf(docFreq=139, maxDocs=43254)
                0.013640767 = queryNorm
              0.42082515 = fieldWeight in 4655, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                6.7332025 = idf(docFreq=139, maxDocs=43254)
                0.0625 = fieldNorm(doc=4655)
          0.07744426 = weight(abstract_txt:citing in 4655) [ClassicSimilarity], result of:
            0.07744426 = score(doc=4655,freq=1.0), product of:
              0.18461087 = queryWeight, product of:
                2.016353 = boost
                6.7120004 = idf(docFreq=142, maxDocs=43254)
                0.013640767 = queryNorm
              0.41950002 = fieldWeight in 4655, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                6.7120004 = idf(docFreq=142, maxDocs=43254)
                0.0625 = fieldNorm(doc=4655)
          0.3108408 = weight(abstract_txt:patent in 4655) [ClassicSimilarity], result of:
            0.3108408 = score(doc=4655,freq=6.0), product of:
              0.29372197 = queryWeight, product of:
                3.1149547 = boost
                6.912671 = idf(docFreq=116, maxDocs=43254)
                0.013640767 = queryNorm
              1.0582824 = fieldWeight in 4655, product of:
                2.4494898 = tf(freq=6.0), with freq of:
                  6.0 = termFreq=6.0
                6.912671 = idf(docFreq=116, maxDocs=43254)
                0.0625 = fieldNorm(doc=4655)
          0.1756163 = weight(abstract_txt:citations in 4655) [ClassicSimilarity], result of:
            0.1756163 = score(doc=4655,freq=5.0), product of:
              0.23477994 = queryWeight, product of:
                3.215758 = boost
                5.3522797 = idf(docFreq=556, maxDocs=43254)
                0.013640767 = queryNorm
              0.74800384 = fieldWeight in 4655, product of:
                2.236068 = tf(freq=5.0), with freq of:
                  5.0 = termFreq=5.0
                5.3522797 = idf(docFreq=556, maxDocs=43254)
                0.0625 = fieldNorm(doc=4655)
          0.45685902 = weight(abstract_txt:patents in 4655) [ClassicSimilarity], result of:
            0.45685902 = score(doc=4655,freq=3.0), product of:
              0.567186 = queryWeight, product of:
                5.5881834 = boost
                7.4407387 = idf(docFreq=68, maxDocs=43254)
                0.013640767 = queryNorm
              0.8054836 = fieldWeight in 4655, product of:
                1.7320508 = tf(freq=3.0), with freq of:
                  3.0 = termFreq=3.0
                7.4407387 = idf(docFreq=68, maxDocs=43254)
                0.0625 = fieldNorm(doc=4655)
        0.2 = coord(5/25)
    
  5. White, M.J.: Patents and patent searching (2009) 0.21
    0.2079267 = sum of:
      0.2079267 = product of:
        1.0396335 = sum of:
          0.08660518 = weight(abstract_txt:granted in 324) [ClassicSimilarity], result of:
            0.08660518 = score(doc=324,freq=1.0), product of:
              0.13604325 = queryWeight, product of:
                1.2239436 = boost
                8.148484 = idf(docFreq=33, maxDocs=43254)
                0.013640767 = queryNorm
              0.6366003 = fieldWeight in 324, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                8.148484 = idf(docFreq=33, maxDocs=43254)
                0.078125 = fieldNorm(doc=324)
          0.08958405 = weight(abstract_txt:hosted in 324) [ClassicSimilarity], result of:
            0.08958405 = score(doc=324,freq=1.0), product of:
              0.1391452 = queryWeight, product of:
                1.2378186 = boost
                8.240858 = idf(docFreq=30, maxDocs=43254)
                0.013640767 = queryNorm
              0.64381707 = fieldWeight in 324, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                8.240858 = idf(docFreq=30, maxDocs=43254)
                0.078125 = fieldNorm(doc=324)
          0.057858832 = weight(abstract_txt:technological in 324) [ClassicSimilarity], result of:
            0.057858832 = score(doc=324,freq=1.0), product of:
              0.13098982 = queryWeight, product of:
                1.6984652 = boost
                5.6538215 = idf(docFreq=411, maxDocs=43254)
                0.013640767 = queryNorm
              0.4417048 = fieldWeight in 324, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.6538215 = idf(docFreq=411, maxDocs=43254)
                0.078125 = fieldNorm(doc=324)
          0.47587582 = weight(abstract_txt:patent in 324) [ClassicSimilarity], result of:
            0.47587582 = score(doc=324,freq=9.0), product of:
              0.29372197 = queryWeight, product of:
                3.1149547 = boost
                6.912671 = idf(docFreq=116, maxDocs=43254)
                0.013640767 = queryNorm
              1.6201574 = fieldWeight in 324, product of:
                3.0 = tf(freq=9.0), with freq of:
                  9.0 = termFreq=9.0
                6.912671 = idf(docFreq=116, maxDocs=43254)
                0.078125 = fieldNorm(doc=324)
          0.3297096 = weight(abstract_txt:patents in 324) [ClassicSimilarity], result of:
            0.3297096 = score(doc=324,freq=1.0), product of:
              0.567186 = queryWeight, product of:
                5.5881834 = boost
                7.4407387 = idf(docFreq=68, maxDocs=43254)
                0.013640767 = queryNorm
              0.5813077 = fieldWeight in 324, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                7.4407387 = idf(docFreq=68, maxDocs=43254)
                0.078125 = fieldNorm(doc=324)
        0.2 = coord(5/25)