Document (#33342)

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) 4.52

   4.5150814 = sum of:
     4.5150814 = weight(author_txt:leydesdorff in 8280) [ClassicSimilarity], result of:
       4.5150814 = fieldWeight in 8280, product of:
         1.0 = tf(freq=1.0), with freq of:
           1.0 = termFreq=1.0
         7.2241306 = idf(docFreq=87, maxDocs=44421)
         0.625 = fieldNorm(doc=8280)
   

2. Leydesdorff, L.: Why words and co-word cannot map the development of the science (1997) 4.52

   4.5150814 = sum of:
     4.5150814 = weight(author_txt:leydesdorff in 1147) [ClassicSimilarity], result of:
       4.5150814 = fieldWeight in 1147, product of:
         1.0 = tf(freq=1.0), with freq of:
           1.0 = termFreq=1.0
         7.2241306 = idf(docFreq=87, maxDocs=44421)
         0.625 = fieldNorm(doc=1147)
   

3. Leydesdorff, L.: Theories of citation? (1999) 4.52

   4.5150814 = sum of:
     4.5150814 = weight(author_txt:leydesdorff in 6130) [ClassicSimilarity], result of:
       4.5150814 = fieldWeight in 6130, product of:
         1.0 = tf(freq=1.0), with freq of:
           1.0 = termFreq=1.0
         7.2241306 = idf(docFreq=87, maxDocs=44421)
         0.625 = fieldNorm(doc=6130)
   

4. Leydesdorff, L.: ¬A sociological theory of communication : the self-organization of the knowledge-based society (2001) 4.52

   4.5150814 = sum of:
     4.5150814 = weight(author_txt:leydesdorff in 1184) [ClassicSimilarity], result of:
       4.5150814 = fieldWeight in 1184, product of:
         1.0 = tf(freq=1.0), with freq of:
           1.0 = termFreq=1.0
         7.2241306 = idf(docFreq=87, maxDocs=44421)
         0.625 = fieldNorm(doc=1184)
   

5. Leydesdorff, L.: Dynamic and evolutionary updates of classificatory schemes in scientific journal structures (2002) 4.52

   4.5150814 = sum of:
     4.5150814 = weight(author_txt:leydesdorff in 2249) [ClassicSimilarity], result of:
       4.5150814 = fieldWeight in 2249, product of:
         1.0 = tf(freq=1.0), with freq of:
           1.0 = termFreq=1.0
         7.2241306 = idf(docFreq=87, maxDocs=44421)
         0.625 = fieldNorm(doc=2249)
   

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

   0.43631598 = sum of:
     0.43631598 = product of:
       1.0907899 = sum of:
         0.016926164 = weight(abstract_txt:data in 113) [ClassicSimilarity], result of:
           0.016926164 = score(doc=113,freq=4.0), product of:
             0.040660705 = queryWeight, product of:
               3.3302255 = idf(docFreq=4320, maxDocs=44421)
               0.012209595 = queryNorm
             0.41627818 = fieldWeight in 113, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               3.3302255 = idf(docFreq=4320, maxDocs=44421)
               0.0625 = fieldNorm(doc=113)
         0.07559516 = weight(abstract_txt:pearson in 113) [ClassicSimilarity], result of:
           0.07559516 = score(doc=113,freq=1.0), product of:
             0.138934 = queryWeight, product of:
               1.307079 = boost
               8.705735 = idf(docFreq=19, maxDocs=44421)
               0.012209595 = queryNorm
             0.54410845 = fieldWeight in 113, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               8.705735 = idf(docFreq=19, maxDocs=44421)
               0.0625 = fieldNorm(doc=113)
         0.019936936 = weight(abstract_txt:should in 113) [ClassicSimilarity], result of:
           0.019936936 = score(doc=113,freq=1.0), product of:
             0.071988225 = queryWeight, product of:
               1.330587 = boost
               4.4311547 = idf(docFreq=1436, maxDocs=44421)
               0.012209595 = queryNorm
             0.27694717 = fieldWeight in 113, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.4311547 = idf(docFreq=1436, maxDocs=44421)
               0.0625 = fieldNorm(doc=113)
         0.15043499 = weight(abstract_txt:symmetrical in 113) [ClassicSimilarity], result of:
           0.15043499 = score(doc=113,freq=2.0), product of:
             0.17446236 = queryWeight, product of:
               1.4646991 = boost
               9.755557 = idf(docFreq=6, maxDocs=44421)
               0.012209595 = queryNorm
             0.86227757 = fieldWeight in 113, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               9.755557 = idf(docFreq=6, maxDocs=44421)
               0.0625 = fieldNorm(doc=113)
         0.1576795 = weight(abstract_txt:asymmetrical in 113) [ClassicSimilarity], result of:
           0.1576795 = score(doc=113,freq=2.0), product of:
             0.18001942 = queryWeight, product of:
               1.4878434 = boost
               9.909708 = idf(docFreq=5, maxDocs=44421)
               0.012209595 = queryNorm
             0.8759027 = fieldWeight in 113, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               9.909708 = idf(docFreq=5, maxDocs=44421)
               0.0625 = fieldNorm(doc=113)
         0.107475795 = weight(abstract_txt:cosine in 113) [ClassicSimilarity], result of:
           0.107475795 = score(doc=113,freq=1.0), product of:
             0.22132458 = queryWeight, product of:
               2.333068 = boost
               7.769642 = idf(docFreq=50, maxDocs=44421)
               0.012209595 = queryNorm
             0.48560262 = fieldWeight in 113, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.769642 = idf(docFreq=50, maxDocs=44421)
               0.0625 = fieldNorm(doc=113)
         0.049106035 = weight(abstract_txt:index in 113) [ClassicSimilarity], result of:
           0.049106035 = score(doc=113,freq=1.0), product of:
             0.16542041 = queryWeight, product of:
               2.8524766 = boost
               4.7496953 = idf(docFreq=1044, maxDocs=44421)
               0.012209595 = queryNorm
             0.29685596 = fieldWeight in 113, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.7496953 = idf(docFreq=1044, maxDocs=44421)
               0.0625 = fieldNorm(doc=113)
         0.15062642 = weight(abstract_txt:occurrence in 113) [ClassicSimilarity], result of:
           0.15062642 = score(doc=113,freq=2.0), product of:
             0.25183168 = queryWeight, product of:
               3.0479887 = boost
               6.7669935 = idf(docFreq=138, maxDocs=44421)
               0.012209595 = queryNorm
             0.5981234 = fieldWeight in 113, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               6.7669935 = idf(docFreq=138, maxDocs=44421)
               0.0625 = fieldNorm(doc=113)
         0.24697249 = weight(abstract_txt:matrix in 113) [ClassicSimilarity], result of:
           0.24697249 = score(doc=113,freq=5.0), product of:
             0.25800532 = queryWeight, product of:
               3.085123 = boost
               6.849437 = idf(docFreq=127, maxDocs=44421)
               0.012209595 = queryNorm
             0.95723796 = fieldWeight in 113, product of:
               2.236068 = tf(freq=5.0), with freq of:
                 5.0 = termFreq=5.0
               6.849437 = idf(docFreq=127, maxDocs=44421)
               0.0625 = fieldNorm(doc=113)
         0.1160364 = weight(abstract_txt:citation in 113) [ClassicSimilarity], result of:
           0.1160364 = score(doc=113,freq=3.0), product of:
             0.21919212 = queryWeight, product of:
               3.67109 = boost
               4.890223 = idf(docFreq=907, maxDocs=44421)
               0.012209595 = queryNorm
             0.52938217 = fieldWeight in 113, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               4.890223 = idf(docFreq=907, maxDocs=44421)
               0.0625 = fieldNorm(doc=113)
       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

   0.35308498 = sum of:
     0.35308498 = product of:
       1.1033906 = sum of:
         0.05797295 = weight(abstract_txt:correlations in 3803) [ClassicSimilarity], result of:
           0.05797295 = score(doc=3803,freq=1.0), product of:
             0.10031275 = queryWeight, product of:
               1.1106459 = boost
               7.3974023 = idf(docFreq=73, maxDocs=44421)
               0.012209595 = queryNorm
             0.57792205 = fieldWeight in 3803, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.3974023 = idf(docFreq=73, maxDocs=44421)
               0.078125 = fieldNorm(doc=3803)
         0.094493955 = weight(abstract_txt:pearson in 3803) [ClassicSimilarity], result of:
           0.094493955 = score(doc=3803,freq=1.0), product of:
             0.138934 = queryWeight, product of:
               1.307079 = boost
               8.705735 = idf(docFreq=19, maxDocs=44421)
               0.012209595 = queryNorm
             0.68013555 = fieldWeight in 3803, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               8.705735 = idf(docFreq=19, maxDocs=44421)
               0.078125 = fieldNorm(doc=3803)
         0.035376646 = weight(abstract_txt:author in 3803) [ClassicSimilarity], result of:
           0.035376646 = score(doc=3803,freq=1.0), product of:
             0.09092716 = queryWeight, product of:
               1.4954069 = boost
               4.980042 = idf(docFreq=829, maxDocs=44421)
               0.012209595 = queryNorm
             0.38906577 = fieldWeight in 3803, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.980042 = idf(docFreq=829, maxDocs=44421)
               0.078125 = fieldNorm(doc=3803)
         0.18999216 = weight(abstract_txt:cosine in 3803) [ClassicSimilarity], result of:
           0.18999216 = score(doc=3803,freq=2.0), product of:
             0.22132458 = queryWeight, product of:
               2.333068 = boost
               7.769642 = idf(docFreq=50, maxDocs=44421)
               0.012209595 = queryNorm
             0.8584323 = fieldWeight in 3803, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               7.769642 = idf(docFreq=50, maxDocs=44421)
               0.078125 = fieldNorm(doc=3803)
         0.2787406 = weight(abstract_txt:salton's in 3803) [ClassicSimilarity], result of:
           0.2787406 = score(doc=3803,freq=1.0), product of:
             0.36003885 = queryWeight, product of:
               2.9756868 = boost
               9.909708 = idf(docFreq=5, maxDocs=44421)
               0.012209595 = queryNorm
             0.7741959 = fieldWeight in 3803, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               9.909708 = idf(docFreq=5, maxDocs=44421)
               0.078125 = fieldNorm(doc=3803)
         0.1331362 = weight(abstract_txt:occurrence in 3803) [ClassicSimilarity], result of:
           0.1331362 = score(doc=3803,freq=1.0), product of:
             0.25183168 = queryWeight, product of:
               3.0479887 = boost
               6.7669935 = idf(docFreq=138, maxDocs=44421)
               0.012209595 = queryNorm
             0.5286714 = fieldWeight in 3803, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.7669935 = idf(docFreq=138, maxDocs=44421)
               0.078125 = fieldNorm(doc=3803)
         0.1952489 = weight(abstract_txt:matrix in 3803) [ClassicSimilarity], result of:
           0.1952489 = score(doc=3803,freq=2.0), product of:
             0.25800532 = queryWeight, product of:
               3.085123 = boost
               6.849437 = idf(docFreq=127, maxDocs=44421)
               0.012209595 = queryNorm
             0.7567631 = fieldWeight in 3803, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               6.849437 = idf(docFreq=127, maxDocs=44421)
               0.078125 = fieldNorm(doc=3803)
         0.118429154 = weight(abstract_txt:citation in 3803) [ClassicSimilarity], result of:
           0.118429154 = score(doc=3803,freq=2.0), product of:
             0.21919212 = queryWeight, product of:
               3.67109 = boost
               4.890223 = idf(docFreq=907, maxDocs=44421)
               0.012209595 = queryNorm
             0.5402984 = fieldWeight in 3803, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               4.890223 = idf(docFreq=907, maxDocs=44421)
               0.078125 = fieldNorm(doc=3803)
       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

   0.3278964 = sum of:
     0.3278964 = product of:
       1.1710585 = sum of:
         0.094493955 = weight(abstract_txt:pearson in 4161) [ClassicSimilarity], result of:
           0.094493955 = score(doc=4161,freq=1.0), product of:
             0.138934 = queryWeight, product of:
               1.307079 = boost
               8.705735 = idf(docFreq=19, maxDocs=44421)
               0.012209595 = queryNorm
             0.68013555 = fieldWeight in 4161, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               8.705735 = idf(docFreq=19, maxDocs=44421)
               0.078125 = fieldNorm(doc=4161)
         0.024921168 = weight(abstract_txt:should in 4161) [ClassicSimilarity], result of:
           0.024921168 = score(doc=4161,freq=1.0), product of:
             0.071988225 = queryWeight, product of:
               1.330587 = boost
               4.4311547 = idf(docFreq=1436, maxDocs=44421)
               0.012209595 = queryNorm
             0.34618396 = fieldWeight in 4161, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.4311547 = idf(docFreq=1436, maxDocs=44421)
               0.078125 = fieldNorm(doc=4161)
         0.035376646 = weight(abstract_txt:author in 4161) [ClassicSimilarity], result of:
           0.035376646 = score(doc=4161,freq=1.0), product of:
             0.09092716 = queryWeight, product of:
               1.4954069 = boost
               4.980042 = idf(docFreq=829, maxDocs=44421)
               0.012209595 = queryNorm
             0.38906577 = fieldWeight in 4161, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.980042 = idf(docFreq=829, maxDocs=44421)
               0.078125 = fieldNorm(doc=4161)
         0.17715764 = weight(abstract_txt:normalization in 4161) [ClassicSimilarity], result of:
           0.17715764 = score(doc=4161,freq=2.0), product of:
             0.21124145 = queryWeight, product of:
               2.2793033 = boost
               7.590594 = idf(docFreq=60, maxDocs=44421)
               0.012209595 = queryNorm
             0.83865 = fieldWeight in 4161, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               7.590594 = idf(docFreq=60, maxDocs=44421)
               0.078125 = fieldNorm(doc=4161)
         0.23269191 = weight(abstract_txt:cosine in 4161) [ClassicSimilarity], result of:
           0.23269191 = score(doc=4161,freq=3.0), product of:
             0.22132458 = queryWeight, product of:
               2.333068 = boost
               7.769642 = idf(docFreq=50, maxDocs=44421)
               0.012209595 = queryNorm
             1.0513605 = fieldWeight in 4161, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               7.769642 = idf(docFreq=50, maxDocs=44421)
               0.078125 = fieldNorm(doc=4161)
         0.2977016 = weight(abstract_txt:occurrence in 4161) [ClassicSimilarity], result of:
           0.2977016 = score(doc=4161,freq=5.0), product of:
             0.25183168 = queryWeight, product of:
               3.0479887 = boost
               6.7669935 = idf(docFreq=138, maxDocs=44421)
               0.012209595 = queryNorm
             1.1821451 = fieldWeight in 4161, product of:
               2.236068 = tf(freq=5.0), with freq of:
                 5.0 = termFreq=5.0
               6.7669935 = idf(docFreq=138, maxDocs=44421)
               0.078125 = fieldNorm(doc=4161)
         0.3087156 = weight(abstract_txt:matrix in 4161) [ClassicSimilarity], result of:
           0.3087156 = score(doc=4161,freq=5.0), product of:
             0.25800532 = queryWeight, product of:
               3.085123 = boost
               6.849437 = idf(docFreq=127, maxDocs=44421)
               0.012209595 = queryNorm
             1.1965475 = fieldWeight in 4161, product of:
               2.236068 = tf(freq=5.0), with freq of:
                 5.0 = termFreq=5.0
               6.849437 = idf(docFreq=127, maxDocs=44421)
               0.078125 = fieldNorm(doc=4161)
       0.28 = coord(7/25)
   

4. Egghe, L.: New relations between similarity measures for vectors based on vector norms (2009) 0.24

   0.23517604 = sum of:
     0.23517604 = product of:
       1.4698503 = sum of:
         0.06697485 = weight(abstract_txt:case in 3708) [ClassicSimilarity], result of:
           0.06697485 = score(doc=3708,freq=2.0), product of:
             0.12642825 = queryWeight, product of:
               2.1596344 = boost
               4.794713 = idf(docFreq=998, maxDocs=44421)
               0.012209595 = queryNorm
             0.52974594 = fieldWeight in 3708, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               4.794713 = idf(docFreq=998, maxDocs=44421)
               0.078125 = fieldNorm(doc=3708)
         0.26868948 = weight(abstract_txt:cosine in 3708) [ClassicSimilarity], result of:
           0.26868948 = score(doc=3708,freq=4.0), product of:
             0.22132458 = queryWeight, product of:
               2.333068 = boost
               7.769642 = idf(docFreq=50, maxDocs=44421)
               0.012209595 = queryNorm
             1.2140065 = fieldWeight in 3708, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               7.769642 = idf(docFreq=50, maxDocs=44421)
               0.078125 = fieldNorm(doc=3708)
         0.5574812 = weight(abstract_txt:salton's in 3708) [ClassicSimilarity], result of:
           0.5574812 = score(doc=3708,freq=4.0), product of:
             0.36003885 = queryWeight, product of:
               2.9756868 = boost
               9.909708 = idf(docFreq=5, maxDocs=44421)
               0.012209595 = queryNorm
             1.5483918 = fieldWeight in 3708, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               9.909708 = idf(docFreq=5, maxDocs=44421)
               0.078125 = fieldNorm(doc=3708)
         0.5767047 = weight(abstract_txt:jaccard in 3708) [ClassicSimilarity], result of:
           0.5767047 = score(doc=3708,freq=2.0), product of:
             0.5845902 = queryWeight, product of:
               5.362327 = boost
               8.928879 = idf(docFreq=15, maxDocs=44421)
               0.012209595 = queryNorm
             0.98651105 = fieldWeight in 3708, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               8.928879 = idf(docFreq=15, maxDocs=44421)
               0.078125 = fieldNorm(doc=3708)
       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

   0.2071778 = sum of:
     0.2071778 = product of:
       1.035889 = sum of:
         0.021157704 = weight(abstract_txt:data in 3942) [ClassicSimilarity], result of:
           0.021157704 = score(doc=3942,freq=4.0), product of:
             0.040660705 = queryWeight, product of:
               3.3302255 = idf(docFreq=4320, maxDocs=44421)
               0.012209595 = queryNorm
             0.5203477 = fieldWeight in 3942, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               3.3302255 = idf(docFreq=4320, maxDocs=44421)
               0.078125 = fieldNorm(doc=3942)
         0.12526938 = weight(abstract_txt:normalization in 3942) [ClassicSimilarity], result of:
           0.12526938 = score(doc=3942,freq=1.0), product of:
             0.21124145 = queryWeight, product of:
               2.2793033 = boost
               7.590594 = idf(docFreq=60, maxDocs=44421)
               0.012209595 = queryNorm
             0.59301513 = fieldWeight in 3942, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.590594 = idf(docFreq=60, maxDocs=44421)
               0.078125 = fieldNorm(doc=3942)
         0.18999216 = weight(abstract_txt:cosine in 3942) [ClassicSimilarity], result of:
           0.18999216 = score(doc=3942,freq=2.0), product of:
             0.22132458 = queryWeight, product of:
               2.333068 = boost
               7.769642 = idf(docFreq=50, maxDocs=44421)
               0.012209595 = queryNorm
             0.8584323 = fieldWeight in 3942, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               7.769642 = idf(docFreq=50, maxDocs=44421)
               0.078125 = fieldNorm(doc=3942)
         0.12276509 = weight(abstract_txt:index in 3942) [ClassicSimilarity], result of:
           0.12276509 = score(doc=3942,freq=4.0), product of:
             0.16542041 = queryWeight, product of:
               2.8524766 = boost
               4.7496953 = idf(docFreq=1044, maxDocs=44421)
               0.012209595 = queryNorm
             0.7421399 = fieldWeight in 3942, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               4.7496953 = idf(docFreq=1044, maxDocs=44421)
               0.078125 = fieldNorm(doc=3942)
         0.5767047 = weight(abstract_txt:jaccard in 3942) [ClassicSimilarity], result of:
           0.5767047 = score(doc=3942,freq=2.0), product of:
             0.5845902 = queryWeight, product of:
               5.362327 = boost
               8.928879 = idf(docFreq=15, maxDocs=44421)
               0.012209595 = queryNorm
             0.98651105 = fieldWeight in 3942, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               8.928879 = idf(docFreq=15, maxDocs=44421)
               0.078125 = fieldNorm(doc=3942)
       0.2 = coord(5/25)