Document (#34709)

Author

Egghe, L.

Title

New relations between similarity measures for vectors based on vector norms

Source

Journal of the American Society for Information Science and Technology. 60(2009) no.2, S.232-239

Year

2009

Abstract

The well-known similarity measures Jaccard, Salton's cosine, Dice, and several related overlap measures for vectors are compared. While general relations are not possible to prove, we study these measures on the trajectories of the form [X]=a[Y], where a > 0 is a constant and [·] denotes the Euclidean norm of a vector. In this case, direct functional relations between these measures are proved. For Jaccard, we prove that it is a convexly increasing function of Salton's cosine measure, but always smaller than or equal to the latter, hereby explaining a curve, experimentally found by Leydesdorff. All the other measures have a linear relation with Salton's cosine, reducing even to equality, in case a = 1. Hence, for equally normed vectors (e.g., for normalized vectors) we, essentially, only have Jaccard's measure and Salton's cosine measure since all the other measures are equal to the latter.

Similar documents (author)

1. Egghe, L.: Little science, big science and beyond (1994) 4.74

   4.741258 = sum of:
     4.741258 = weight(author_txt:egghe in 6883) [ClassicSimilarity], result of:
       4.741258 = fieldWeight in 6883, product of:
         1.0 = tf(freq=1.0), with freq of:
           1.0 = termFreq=1.0
         7.5860133 = idf(docFreq=60, maxDocs=44218)
         0.625 = fieldNorm(doc=6883)
   

2. Egghe, L.: Expansion of the field of informetrics : the second special issue (2006) 4.74

   4.741258 = sum of:
     4.741258 = weight(author_txt:egghe in 7119) [ClassicSimilarity], result of:
       4.741258 = fieldWeight in 7119, product of:
         1.0 = tf(freq=1.0), with freq of:
           1.0 = termFreq=1.0
         7.5860133 = idf(docFreq=60, maxDocs=44218)
         0.625 = fieldNorm(doc=7119)
   

3. Egghe, L.: Expansion of the field of informetrics : origins and consequences (2005) 4.74

   4.741258 = sum of:
     4.741258 = weight(author_txt:egghe in 1910) [ClassicSimilarity], result of:
       4.741258 = fieldWeight in 1910, product of:
         1.0 = tf(freq=1.0), with freq of:
           1.0 = termFreq=1.0
         7.5860133 = idf(docFreq=60, maxDocs=44218)
         0.625 = fieldNorm(doc=1910)
   

4. Egghe, L.: ¬The amount of actions needed for shelving and reshelving (1996) 4.74

   4.741258 = sum of:
     4.741258 = weight(author_txt:egghe in 4394) [ClassicSimilarity], result of:
       4.741258 = fieldWeight in 4394, product of:
         1.0 = tf(freq=1.0), with freq of:
           1.0 = termFreq=1.0
         7.5860133 = idf(docFreq=60, maxDocs=44218)
         0.625 = fieldNorm(doc=4394)
   

5. Egghe, L.: Special features of the author - publication relationship and a new explanation of Lotka's law based on convolution theory (1994) 4.74

   4.741258 = sum of:
     4.741258 = weight(author_txt:egghe in 5068) [ClassicSimilarity], result of:
       4.741258 = fieldWeight in 5068, product of:
         1.0 = tf(freq=1.0), with freq of:
           1.0 = termFreq=1.0
         7.5860133 = idf(docFreq=60, maxDocs=44218)
         0.625 = fieldNorm(doc=5068)
   

Similar documents (content)

1. Egghe, L.: Good properties of similarity measures and their complementarity (2010) 0.69

   0.69326645 = sum of:
     0.69326645 = product of:
       1.92574 = sum of:
         0.16898432 = weight(abstract_txt:dice in 3993) [ClassicSimilarity], result of:
           0.16898432 = score(doc=3993,freq=3.0), product of:
             0.13145818 = queryWeight, product of:
               1.2679412 = boost
               9.499662 = idf(docFreq=8, maxDocs=44218)
               0.010913909 = queryNorm
             1.2854607 = fieldWeight in 3993, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               9.499662 = idf(docFreq=8, maxDocs=44218)
               0.078125 = fieldNorm(doc=3993)
         0.109861605 = weight(abstract_txt:similarity in 3993) [ClassicSimilarity], result of:
           0.109861605 = score(doc=3993,freq=6.0), product of:
             0.09865534 = queryWeight, product of:
               1.5533904 = boost
               5.8191514 = idf(docFreq=356, maxDocs=44218)
               0.010913909 = queryNorm
             1.11359 = fieldWeight in 3993, product of:
               2.4494898 = tf(freq=6.0), with freq of:
                 6.0 = termFreq=6.0
               5.8191514 = idf(docFreq=356, maxDocs=44218)
               0.078125 = fieldNorm(doc=3993)
         0.06062816 = weight(abstract_txt:latter in 3993) [ClassicSimilarity], result of:
           0.06062816 = score(doc=3993,freq=1.0), product of:
             0.120611854 = queryWeight, product of:
               1.7175734 = boost
               6.434197 = idf(docFreq=192, maxDocs=44218)
               0.010913909 = queryNorm
             0.50267166 = fieldWeight in 3993, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.434197 = idf(docFreq=192, maxDocs=44218)
               0.078125 = fieldNorm(doc=3993)
         0.0892476 = weight(abstract_txt:vector in 3993) [ClassicSimilarity], result of:
           0.0892476 = score(doc=3993,freq=2.0), product of:
             0.123878166 = queryWeight, product of:
               1.740675 = boost
               6.5207376 = idf(docFreq=176, maxDocs=44218)
               0.010913909 = queryNorm
             0.7204466 = fieldWeight in 3993, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               6.5207376 = idf(docFreq=176, maxDocs=44218)
               0.078125 = fieldNorm(doc=3993)
         0.07761558 = weight(abstract_txt:measure in 3993) [ClassicSimilarity], result of:
           0.07761558 = score(doc=3993,freq=2.0), product of:
             0.12919928 = queryWeight, product of:
               2.1771882 = boost
               5.437306 = idf(docFreq=522, maxDocs=44218)
               0.010913909 = queryNorm
             0.6007431 = fieldWeight in 3993, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               5.437306 = idf(docFreq=522, maxDocs=44218)
               0.078125 = fieldNorm(doc=3993)
         0.2802039 = weight(abstract_txt:jaccard in 3993) [ClassicSimilarity], result of:
           0.2802039 = score(doc=3993,freq=3.0), product of:
             0.23203284 = queryWeight, product of:
               2.3822923 = boost
               8.924298 = idf(docFreq=15, maxDocs=44218)
               0.010913909 = queryNorm
             1.2076045 = fieldWeight in 3993, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               8.924298 = idf(docFreq=15, maxDocs=44218)
               0.078125 = fieldNorm(doc=3993)
         0.3691617 = weight(abstract_txt:cosine in 3993) [ClassicSimilarity], result of:
           0.3691617 = score(doc=3993,freq=3.0), product of:
             0.35133472 = queryWeight, product of:
               4.1456804 = boost
               7.7650614 = idf(docFreq=50, maxDocs=44218)
               0.010913909 = queryNorm
             1.0507407 = fieldWeight in 3993, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               7.7650614 = idf(docFreq=50, maxDocs=44218)
               0.078125 = fieldNorm(doc=3993)
         0.4839898 = weight(abstract_txt:vectors in 3993) [ClassicSimilarity], result of:
           0.4839898 = score(doc=3993,freq=5.0), product of:
             0.35496417 = queryWeight, product of:
               4.167039 = boost
               7.805067 = idf(docFreq=48, maxDocs=44218)
               0.010913909 = queryNorm
             1.3634892 = fieldWeight in 3993, product of:
               2.236068 = tf(freq=5.0), with freq of:
                 5.0 = termFreq=5.0
               7.805067 = idf(docFreq=48, maxDocs=44218)
               0.078125 = fieldNorm(doc=3993)
         0.2860473 = weight(abstract_txt:measures in 3993) [ClassicSimilarity], result of:
           0.2860473 = score(doc=3993,freq=5.0), product of:
             0.3012532 = queryWeight, product of:
               5.0783215 = boost
               5.4353957 = idf(docFreq=523, maxDocs=44218)
               0.010913909 = queryNorm
             0.9495246 = fieldWeight in 3993, product of:
               2.236068 = tf(freq=5.0), with freq of:
                 5.0 = termFreq=5.0
               5.4353957 = idf(docFreq=523, maxDocs=44218)
               0.078125 = fieldNorm(doc=3993)
       0.36 = coord(9/25)
   

2. Egghe, L.: On the relation between the association strength and other similarity measures (2010) 0.39

   0.38557383 = sum of:
     0.38557383 = product of:
       1.3770494 = sum of:
         0.10154764 = weight(abstract_txt:trajectories in 3598) [ClassicSimilarity], result of:
           0.10154764 = score(doc=3598,freq=1.0), product of:
             0.10788431 = queryWeight, product of:
               1.1486413 = boost
               8.6058445 = idf(docFreq=21, maxDocs=44218)
               0.010913909 = queryNorm
             0.9412643 = fieldWeight in 3598, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               8.6058445 = idf(docFreq=21, maxDocs=44218)
               0.109375 = fieldNorm(doc=3598)
         0.08880007 = weight(abstract_txt:similarity in 3598) [ClassicSimilarity], result of:
           0.08880007 = score(doc=3598,freq=2.0), product of:
             0.09865534 = queryWeight, product of:
               1.5533904 = boost
               5.8191514 = idf(docFreq=356, maxDocs=44218)
               0.010913909 = queryNorm
             0.90010405 = fieldWeight in 3598, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               5.8191514 = idf(docFreq=356, maxDocs=44218)
               0.109375 = fieldNorm(doc=3598)
         0.112701654 = weight(abstract_txt:prove in 3598) [ClassicSimilarity], result of:
           0.112701654 = score(doc=3598,freq=1.0), product of:
             0.14570527 = queryWeight, product of:
               1.8878084 = boost
               7.071914 = idf(docFreq=101, maxDocs=44218)
               0.010913909 = queryNorm
             0.7734906 = fieldWeight in 3598, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.071914 = idf(docFreq=101, maxDocs=44218)
               0.109375 = fieldNorm(doc=3598)
         0.11532728 = weight(abstract_txt:relations in 3598) [ClassicSimilarity], result of:
           0.11532728 = score(doc=3598,freq=2.0), product of:
             0.1344302 = queryWeight, product of:
               2.2208252 = boost
               5.5462847 = idf(docFreq=468, maxDocs=44218)
               0.010913909 = queryNorm
             0.8578971 = fieldWeight in 3598, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               5.5462847 = idf(docFreq=468, maxDocs=44218)
               0.109375 = fieldNorm(doc=3598)
         0.22648612 = weight(abstract_txt:jaccard in 3598) [ClassicSimilarity], result of:
           0.22648612 = score(doc=3598,freq=1.0), product of:
             0.23203284 = queryWeight, product of:
               2.3822923 = boost
               8.924298 = idf(docFreq=15, maxDocs=44218)
               0.010913909 = queryNorm
             0.97609514 = fieldWeight in 3598, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               8.924298 = idf(docFreq=15, maxDocs=44218)
               0.109375 = fieldNorm(doc=3598)
         0.42198697 = weight(abstract_txt:cosine in 3598) [ClassicSimilarity], result of:
           0.42198697 = score(doc=3598,freq=2.0), product of:
             0.35133472 = queryWeight, product of:
               4.1456804 = boost
               7.7650614 = idf(docFreq=50, maxDocs=44218)
               0.010913909 = queryNorm
             1.2010967 = fieldWeight in 3598, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               7.7650614 = idf(docFreq=50, maxDocs=44218)
               0.109375 = fieldNorm(doc=3598)
         0.3101998 = weight(abstract_txt:measures in 3598) [ClassicSimilarity], result of:
           0.3101998 = score(doc=3598,freq=3.0), product of:
             0.3012532 = queryWeight, product of:
               5.0783215 = boost
               5.4353957 = idf(docFreq=523, maxDocs=44218)
               0.010913909 = queryNorm
             1.0296979 = fieldWeight in 3598, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               5.4353957 = idf(docFreq=523, maxDocs=44218)
               0.109375 = fieldNorm(doc=3598)
       0.28 = coord(7/25)
   

3. Eck, N.J. van; Waltman, L.: How to normalize cooccurrence data? : an analysis of some well-known similarity measures (2009) 0.27

   0.26783735 = sum of:
     0.26783735 = product of:
       1.115989 = sum of:
         0.047861736 = weight(abstract_txt:normalized in 2942) [ClassicSimilarity], result of:
           0.047861736 = score(doc=2942,freq=1.0), product of:
             0.08176913 = queryWeight, product of:
               7.4921947 = idf(docFreq=66, maxDocs=44218)
               0.010913909 = queryNorm
             0.5853277 = fieldWeight in 2942, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.4921947 = idf(docFreq=66, maxDocs=44218)
               0.078125 = fieldNorm(doc=2942)
         0.08970162 = weight(abstract_txt:similarity in 2942) [ClassicSimilarity], result of:
           0.08970162 = score(doc=2942,freq=4.0), product of:
             0.09865534 = queryWeight, product of:
               1.5533904 = boost
               5.8191514 = idf(docFreq=356, maxDocs=44218)
               0.010913909 = queryNorm
             0.9092424 = fieldWeight in 2942, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               5.8191514 = idf(docFreq=356, maxDocs=44218)
               0.078125 = fieldNorm(doc=2942)
         0.109765 = weight(abstract_txt:measure in 2942) [ClassicSimilarity], result of:
           0.109765 = score(doc=2942,freq=4.0), product of:
             0.12919928 = queryWeight, product of:
               2.1771882 = boost
               5.437306 = idf(docFreq=522, maxDocs=44218)
               0.010913909 = queryNorm
             0.84957904 = fieldWeight in 2942, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               5.437306 = idf(docFreq=522, maxDocs=44218)
               0.078125 = fieldNorm(doc=2942)
         0.22878554 = weight(abstract_txt:jaccard in 2942) [ClassicSimilarity], result of:
           0.22878554 = score(doc=2942,freq=2.0), product of:
             0.23203284 = queryWeight, product of:
               2.3822923 = boost
               8.924298 = idf(docFreq=15, maxDocs=44218)
               0.010913909 = queryNorm
             0.986005 = fieldWeight in 2942, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               8.924298 = idf(docFreq=15, maxDocs=44218)
               0.078125 = fieldNorm(doc=2942)
         0.30141923 = weight(abstract_txt:cosine in 2942) [ClassicSimilarity], result of:
           0.30141923 = score(doc=2942,freq=2.0), product of:
             0.35133472 = queryWeight, product of:
               4.1456804 = boost
               7.7650614 = idf(docFreq=50, maxDocs=44218)
               0.010913909 = queryNorm
             0.85792613 = fieldWeight in 2942, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               7.7650614 = idf(docFreq=50, maxDocs=44218)
               0.078125 = fieldNorm(doc=2942)
         0.33845574 = weight(abstract_txt:measures in 2942) [ClassicSimilarity], result of:
           0.33845574 = score(doc=2942,freq=7.0), product of:
             0.3012532 = queryWeight, product of:
               5.0783215 = boost
               5.4353957 = idf(docFreq=523, maxDocs=44218)
               0.010913909 = queryNorm
             1.1234926 = fieldWeight in 2942, product of:
               2.6457512 = tf(freq=7.0), with freq of:
                 7.0 = termFreq=7.0
               5.4353957 = idf(docFreq=523, maxDocs=44218)
               0.078125 = fieldNorm(doc=2942)
       0.24 = coord(6/25)
   

4. Leydesdorff, L.: On the normalization and visualization of author co-citation data : Salton's Cosine versus the Jaccard index (2008) 0.26

   0.25902167 = sum of:
     0.25902167 = product of:
       1.079257 = sum of:
         0.043798022 = weight(abstract_txt:case in 1341) [ClassicSimilarity], result of:
           0.043798022 = score(doc=1341,freq=3.0), product of:
             0.06732912 = queryWeight, product of:
               1.2832811 = boost
               4.807296 = idf(docFreq=981, maxDocs=44218)
               0.010913909 = queryNorm
             0.6505063 = fieldWeight in 1341, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               4.807296 = idf(docFreq=981, maxDocs=44218)
               0.078125 = fieldNorm(doc=1341)
         0.04485081 = weight(abstract_txt:similarity in 1341) [ClassicSimilarity], result of:
           0.04485081 = score(doc=1341,freq=1.0), product of:
             0.09865534 = queryWeight, product of:
               1.5533904 = boost
               5.8191514 = idf(docFreq=356, maxDocs=44218)
               0.010913909 = queryNorm
             0.4546212 = fieldWeight in 1341, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.8191514 = idf(docFreq=356, maxDocs=44218)
               0.078125 = fieldNorm(doc=1341)
         0.0548825 = weight(abstract_txt:measure in 1341) [ClassicSimilarity], result of:
           0.0548825 = score(doc=1341,freq=1.0), product of:
             0.12919928 = queryWeight, product of:
               2.1771882 = boost
               5.437306 = idf(docFreq=522, maxDocs=44218)
               0.010913909 = queryNorm
             0.42478952 = fieldWeight in 1341, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.437306 = idf(docFreq=522, maxDocs=44218)
               0.078125 = fieldNorm(doc=1341)
         0.2802039 = weight(abstract_txt:jaccard in 1341) [ClassicSimilarity], result of:
           0.2802039 = score(doc=1341,freq=3.0), product of:
             0.23203284 = queryWeight, product of:
               2.3822923 = boost
               8.924298 = idf(docFreq=15, maxDocs=44218)
               0.010913909 = queryNorm
             1.2076045 = fieldWeight in 1341, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               8.924298 = idf(docFreq=15, maxDocs=44218)
               0.078125 = fieldNorm(doc=1341)
         0.2131356 = weight(abstract_txt:cosine in 1341) [ClassicSimilarity], result of:
           0.2131356 = score(doc=1341,freq=1.0), product of:
             0.35133472 = queryWeight, product of:
               4.1456804 = boost
               7.7650614 = idf(docFreq=50, maxDocs=44218)
               0.010913909 = queryNorm
             0.6066454 = fieldWeight in 1341, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.7650614 = idf(docFreq=50, maxDocs=44218)
               0.078125 = fieldNorm(doc=1341)
         0.44238615 = weight(abstract_txt:salton's in 1341) [ClassicSimilarity], result of:
           0.44238615 = score(doc=1341,freq=1.0), product of:
             0.5716779 = queryWeight, product of:
               5.288238 = boost
               9.905128 = idf(docFreq=5, maxDocs=44218)
               0.010913909 = queryNorm
             0.7738381 = fieldWeight in 1341, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               9.905128 = idf(docFreq=5, maxDocs=44218)
               0.078125 = fieldNorm(doc=1341)
       0.24 = coord(6/25)
   

5. Egghe, L.; Leydesdorff, L.: ¬The relation between Pearson's correlation coefficient r and Salton's cosine measure (2009) 0.24

   0.24362889 = sum of:
     0.24362889 = product of:
       1.0151204 = sum of:
         0.068935886 = weight(abstract_txt:norm in 2803) [ClassicSimilarity], result of:
           0.068935886 = score(doc=2803,freq=2.0), product of:
             0.082772106 = queryWeight, product of:
               1.0061142 = boost
               7.538004 = idf(docFreq=63, maxDocs=44218)
               0.010913909 = queryNorm
             0.8328396 = fieldWeight in 2803, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               7.538004 = idf(docFreq=63, maxDocs=44218)
               0.078125 = fieldNorm(doc=2803)
         0.0892476 = weight(abstract_txt:vector in 2803) [ClassicSimilarity], result of:
           0.0892476 = score(doc=2803,freq=2.0), product of:
             0.123878166 = queryWeight, product of:
               1.740675 = boost
               6.5207376 = idf(docFreq=176, maxDocs=44218)
               0.010913909 = queryNorm
             0.7204466 = fieldWeight in 2803, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               6.5207376 = idf(docFreq=176, maxDocs=44218)
               0.078125 = fieldNorm(doc=2803)
         0.0548825 = weight(abstract_txt:measure in 2803) [ClassicSimilarity], result of:
           0.0548825 = score(doc=2803,freq=1.0), product of:
             0.12919928 = queryWeight, product of:
               2.1771882 = boost
               5.437306 = idf(docFreq=522, maxDocs=44218)
               0.010913909 = queryNorm
             0.42478952 = fieldWeight in 2803, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.437306 = idf(docFreq=522, maxDocs=44218)
               0.078125 = fieldNorm(doc=2803)
         0.05824907 = weight(abstract_txt:relations in 2803) [ClassicSimilarity], result of:
           0.05824907 = score(doc=2803,freq=1.0), product of:
             0.1344302 = queryWeight, product of:
               2.2208252 = boost
               5.5462847 = idf(docFreq=468, maxDocs=44218)
               0.010913909 = queryNorm
             0.43330348 = fieldWeight in 2803, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.5462847 = idf(docFreq=468, maxDocs=44218)
               0.078125 = fieldNorm(doc=2803)
         0.30141923 = weight(abstract_txt:cosine in 2803) [ClassicSimilarity], result of:
           0.30141923 = score(doc=2803,freq=2.0), product of:
             0.35133472 = queryWeight, product of:
               4.1456804 = boost
               7.7650614 = idf(docFreq=50, maxDocs=44218)
               0.010913909 = queryNorm
             0.85792613 = fieldWeight in 2803, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               7.7650614 = idf(docFreq=50, maxDocs=44218)
               0.078125 = fieldNorm(doc=2803)
         0.44238615 = weight(abstract_txt:salton's in 2803) [ClassicSimilarity], result of:
           0.44238615 = score(doc=2803,freq=1.0), product of:
             0.5716779 = queryWeight, product of:
               5.288238 = boost
               9.905128 = idf(docFreq=5, maxDocs=44218)
               0.010913909 = queryNorm
             0.7738381 = fieldWeight in 2803, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               9.905128 = idf(docFreq=5, maxDocs=44218)
               0.078125 = fieldNorm(doc=2803)
       0.24 = coord(6/25)