Document (#35465)

Author

Liu, X.
Yu, S.
Janssens, F.
Glänzel, W.
Moreau, Y.
Moor, B.de

Title

Weighted hybrid clustering by combining text mining and bibliometrics on a large-scale journal database

Source

Journal of the American Society for Information Science and Technology. 61(2010) no.6, S.1105-1119

Year

2010

Abstract

We propose a new hybrid clustering framework to incorporate text mining with bibliometrics in journal set analysis. The framework integrates two different approaches: clustering ensemble and kernel-fusion clustering. To improve the flexibility and the efficiency of processing large-scale data, we propose an information-based weighting scheme to leverage the effect of multiple data sources in hybrid clustering. Three different algorithms are extended by the proposed weighting scheme and they are employed on a large journal set retrieved from the Web of Science (WoS) database. The clustering performance of the proposed algorithms is systematically evaluated using multiple evaluation methods, and they were cross-compared with alternative methods. Experimental results demonstrate that the proposed weighted hybrid clustering strategy is superior to other methods in clustering performance and efficiency. The proposed approach also provides a more refined structural mapping of journal sets, which is useful for monitoring and detecting new trends in different scientific fields.

Theme

Automatisches Klassifizieren
Data Mining

Similar documents (author)

1. Glänzel, W.: Visual bibliometrics : eine visuelle Oberfläche zur Erweiterung der Nutzungsmöglichkeiten bibliographischer Datenbanken (1996) 5.66

   5.664006 = sum of:
     5.664006 = weight(author_txt:glänzel in 6178) [ClassicSimilarity], result of:
       5.664006 = fieldWeight in 6178, product of:
         1.0 = tf(freq=1.0), with freq of:
           1.0 = termFreq=1.0
         9.06241 = idf(docFreq=13, maxDocs=44421)
         0.625 = fieldNorm(doc=6178)
   

2. Glänzel, W.: Coauthorship patterns and trends in the sciences (1980-1998) : a bibliometric study with implications for database indexing and search strategies (2002) 5.66

   5.664006 = sum of:
     5.664006 = weight(author_txt:glänzel in 935) [ClassicSimilarity], result of:
       5.664006 = fieldWeight in 935, product of:
         1.0 = tf(freq=1.0), with freq of:
           1.0 = termFreq=1.0
         9.06241 = idf(docFreq=13, maxDocs=44421)
         0.625 = fieldNorm(doc=935)
   

3. Glänzel, W.: Bibliometrics-aided retrieval - where information retrieval meets scientometrics (2015) 5.66

   5.664006 = sum of:
     5.664006 = weight(author_txt:glänzel in 2690) [ClassicSimilarity], result of:
       5.664006 = fieldWeight in 2690, product of:
         1.0 = tf(freq=1.0), with freq of:
           1.0 = termFreq=1.0
         9.06241 = idf(docFreq=13, maxDocs=44421)
         0.625 = fieldNorm(doc=2690)
   

4. Glänzel, W.; Moed, H.F.: Journal impact measures in bibliometric research (2002) 4.53

   4.531205 = sum of:
     4.531205 = weight(author_txt:glänzel in 2972) [ClassicSimilarity], result of:
       4.531205 = fieldWeight in 2972, product of:
         1.0 = tf(freq=1.0), with freq of:
           1.0 = termFreq=1.0
         9.06241 = idf(docFreq=13, maxDocs=44421)
         0.5 = fieldNorm(doc=2972)
   

5. Schoepflin, U.; Glänzel, W.: Mehrwert von bibliographischen Datenbanken (1994) 4.53

   4.531205 = sum of:
     4.531205 = weight(author_txt:glänzel in 6180) [ClassicSimilarity], result of:
       4.531205 = fieldWeight in 6180, product of:
         1.0 = tf(freq=1.0), with freq of:
           1.0 = termFreq=1.0
         9.06241 = idf(docFreq=13, maxDocs=44421)
         0.5 = fieldNorm(doc=6180)
   

Similar documents (content)

1. Zhan, J.; Loh, H.T.: Using latent semantic indexing to improve the accuracy of document clustering (2007) 0.31

   0.3068323 = sum of:
     0.3068323 = product of:
       1.0958297 = sum of:
         0.021200817 = weight(abstract_txt:text in 1264) [ClassicSimilarity], result of:
           0.021200817 = score(doc=1264,freq=1.0), product of:
             0.06715624 = queryWeight, product of:
               1.05038 = boost
               4.040882 = idf(docFreq=2122, maxDocs=44421)
               0.015822086 = queryNorm
             0.3156939 = fieldWeight in 1264, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.040882 = idf(docFreq=2122, maxDocs=44421)
               0.078125 = fieldNorm(doc=1264)
         0.03167977 = weight(abstract_txt:performance in 1264) [ClassicSimilarity], result of:
           0.03167977 = score(doc=1264,freq=1.0), product of:
             0.08777537 = queryWeight, product of:
               1.2008523 = boost
               4.619759 = idf(docFreq=1189, maxDocs=44421)
               0.015822086 = queryNorm
             0.36091867 = fieldWeight in 1264, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.619759 = idf(docFreq=1189, maxDocs=44421)
               0.078125 = fieldNorm(doc=1264)
         0.07225423 = weight(abstract_txt:efficiency in 1264) [ClassicSimilarity], result of:
           0.07225423 = score(doc=1264,freq=1.0), product of:
             0.1520875 = queryWeight, product of:
               1.580702 = boost
               6.0810666 = idf(docFreq=275, maxDocs=44421)
               0.015822086 = queryNorm
             0.47508332 = fieldWeight in 1264, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.0810666 = idf(docFreq=275, maxDocs=44421)
               0.078125 = fieldNorm(doc=1264)
         0.075545736 = weight(abstract_txt:mining in 1264) [ClassicSimilarity], result of:
           0.075545736 = score(doc=1264,freq=1.0), product of:
             0.15667196 = queryWeight, product of:
               1.604349 = boost
               6.1720386 = idf(docFreq=251, maxDocs=44421)
               0.015822086 = queryNorm
             0.48219052 = fieldWeight in 1264, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.1720386 = idf(docFreq=251, maxDocs=44421)
               0.078125 = fieldNorm(doc=1264)
         0.03428536 = weight(abstract_txt:methods in 1264) [ClassicSimilarity], result of:
           0.03428536 = score(doc=1264,freq=1.0), product of:
             0.1059142 = queryWeight, product of:
               1.6155707 = boost
               4.1434727 = idf(docFreq=1915, maxDocs=44421)
               0.015822086 = queryNorm
             0.3237088 = fieldWeight in 1264, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.1434727 = idf(docFreq=1915, maxDocs=44421)
               0.078125 = fieldNorm(doc=1264)
         0.042252656 = weight(abstract_txt:large in 1264) [ClassicSimilarity], result of:
           0.042252656 = score(doc=1264,freq=1.0), product of:
             0.121744975 = queryWeight, product of:
               1.7321057 = boost
               4.4423513 = idf(docFreq=1420, maxDocs=44421)
               0.015822086 = queryNorm
             0.3470587 = fieldWeight in 1264, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.4423513 = idf(docFreq=1420, maxDocs=44421)
               0.078125 = fieldNorm(doc=1264)
         0.8186112 = weight(abstract_txt:clustering in 1264) [ClassicSimilarity], result of:
           0.8186112 = score(doc=1264,freq=7.0), product of:
             0.6366349 = queryWeight, product of:
               6.468126 = boost
               6.2208285 = idf(docFreq=239, maxDocs=44421)
               0.015822086 = queryNorm
             1.285841 = fieldWeight in 1264, product of:
               2.6457512 = tf(freq=7.0), with freq of:
                 7.0 = termFreq=7.0
               6.2208285 = idf(docFreq=239, maxDocs=44421)
               0.078125 = fieldNorm(doc=1264)
       0.28 = coord(7/25)
   

2. Miyamoto, S.: Information clustering based an fuzzy multisets (2003) 0.24

   0.23645277 = sum of:
     0.23645277 = product of:
       0.9852199 = sum of:
         0.043464698 = weight(abstract_txt:multiple in 2071) [ClassicSimilarity], result of:
           0.043464698 = score(doc=2071,freq=1.0), product of:
             0.10837832 = queryWeight, product of:
               1.3343644 = boost
               5.1333895 = idf(docFreq=711, maxDocs=44421)
               0.015822086 = queryNorm
             0.40104604 = fieldWeight in 2071, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.1333895 = idf(docFreq=711, maxDocs=44421)
               0.078125 = fieldNorm(doc=2071)
         0.023624543 = weight(abstract_txt:different in 2071) [ClassicSimilarity], result of:
           0.023624543 = score(doc=2071,freq=1.0), product of:
             0.082627386 = queryWeight, product of:
               1.426957 = boost
               3.6597328 = idf(docFreq=3107, maxDocs=44421)
               0.015822086 = queryNorm
             0.28591663 = fieldWeight in 2071, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.6597328 = idf(docFreq=3107, maxDocs=44421)
               0.078125 = fieldNorm(doc=2071)
         0.10306738 = weight(abstract_txt:algorithms in 2071) [ClassicSimilarity], result of:
           0.10306738 = score(doc=2071,freq=3.0), product of:
             0.13362624 = queryWeight, product of:
               1.4816619 = boost
               5.7000527 = idf(docFreq=403, maxDocs=44421)
               0.015822086 = queryNorm
             0.771311 = fieldWeight in 2071, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               5.7000527 = idf(docFreq=403, maxDocs=44421)
               0.078125 = fieldNorm(doc=2071)
         0.03428536 = weight(abstract_txt:methods in 2071) [ClassicSimilarity], result of:
           0.03428536 = score(doc=2071,freq=1.0), product of:
             0.1059142 = queryWeight, product of:
               1.6155707 = boost
               4.1434727 = idf(docFreq=1915, maxDocs=44421)
               0.015822086 = queryNorm
             0.3237088 = fieldWeight in 2071, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.1434727 = idf(docFreq=1915, maxDocs=44421)
               0.078125 = fieldNorm(doc=2071)
         0.08892508 = weight(abstract_txt:proposed in 2071) [ClassicSimilarity], result of:
           0.08892508 = score(doc=2071,freq=2.0), product of:
             0.17466296 = queryWeight, product of:
               2.395624 = boost
               4.608063 = idf(docFreq=1203, maxDocs=44421)
               0.015822086 = queryNorm
             0.50912386 = fieldWeight in 2071, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               4.608063 = idf(docFreq=1203, maxDocs=44421)
               0.078125 = fieldNorm(doc=2071)
         0.6918528 = weight(abstract_txt:clustering in 2071) [ClassicSimilarity], result of:
           0.6918528 = score(doc=2071,freq=5.0), product of:
             0.6366349 = queryWeight, product of:
               6.468126 = boost
               6.2208285 = idf(docFreq=239, maxDocs=44421)
               0.015822086 = queryNorm
             1.086734 = fieldWeight in 2071, product of:
               2.236068 = tf(freq=5.0), with freq of:
                 5.0 = termFreq=5.0
               6.2208285 = idf(docFreq=239, maxDocs=44421)
               0.078125 = fieldNorm(doc=2071)
       0.24 = coord(6/25)
   

3. Ruocco, A.S.; Frieder, O.: Clustering and classification of large document bases in a parallel environment (1997) 0.20

   0.19998057 = sum of:
     0.19998057 = product of:
       0.99990284 = sum of:
         0.038015727 = weight(abstract_txt:performance in 2661) [ClassicSimilarity], result of:
           0.038015727 = score(doc=2661,freq=1.0), product of:
             0.08777537 = queryWeight, product of:
               1.2008523 = boost
               4.619759 = idf(docFreq=1189, maxDocs=44421)
               0.015822086 = queryNorm
             0.43310243 = fieldWeight in 2661, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.619759 = idf(docFreq=1189, maxDocs=44421)
               0.09375 = fieldNorm(doc=2661)
         0.06369081 = weight(abstract_txt:scheme in 2661) [ClassicSimilarity], result of:
           0.06369081 = score(doc=2661,freq=1.0), product of:
             0.12381739 = queryWeight, product of:
               1.4262447 = boost
               5.4868593 = idf(docFreq=499, maxDocs=44421)
               0.015822086 = queryNorm
             0.5143931 = fieldWeight in 2661, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.4868593 = idf(docFreq=499, maxDocs=44421)
               0.09375 = fieldNorm(doc=2661)
         0.050703183 = weight(abstract_txt:large in 2661) [ClassicSimilarity], result of:
           0.050703183 = score(doc=2661,freq=1.0), product of:
             0.121744975 = queryWeight, product of:
               1.7321057 = boost
               4.4423513 = idf(docFreq=1420, maxDocs=44421)
               0.015822086 = queryNorm
             0.41647044 = fieldWeight in 2661, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.4423513 = idf(docFreq=1420, maxDocs=44421)
               0.09375 = fieldNorm(doc=2661)
         0.104918785 = weight(abstract_txt:journal in 2661) [ClassicSimilarity], result of:
           0.104918785 = score(doc=2661,freq=1.0), product of:
             0.21759187 = queryWeight, product of:
               2.6738656 = boost
               5.14327 = idf(docFreq=704, maxDocs=44421)
               0.015822086 = queryNorm
             0.48218155 = fieldWeight in 2661, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.14327 = idf(docFreq=704, maxDocs=44421)
               0.09375 = fieldNorm(doc=2661)
         0.74257433 = weight(abstract_txt:clustering in 2661) [ClassicSimilarity], result of:
           0.74257433 = score(doc=2661,freq=4.0), product of:
             0.6366349 = queryWeight, product of:
               6.468126 = boost
               6.2208285 = idf(docFreq=239, maxDocs=44421)
               0.015822086 = queryNorm
             1.1664053 = fieldWeight in 2661, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               6.2208285 = idf(docFreq=239, maxDocs=44421)
               0.09375 = fieldNorm(doc=2661)
       0.2 = coord(5/25)
   

4. Lu, K.; Mao, J.; Li, G.: Toward effective automated weighted subject indexing : a comparison of different approaches in different environments (2018) 0.19

   0.19082972 = sum of:
     0.19082972 = product of:
       0.5963429 = sum of:
         0.023985986 = weight(abstract_txt:text in 292) [ClassicSimilarity], result of:
           0.023985986 = score(doc=292,freq=2.0), product of:
             0.06715624 = queryWeight, product of:
               1.05038 = boost
               4.040882 = idf(docFreq=2122, maxDocs=44421)
               0.015822086 = queryNorm
             0.3571669 = fieldWeight in 292, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               4.040882 = idf(docFreq=2122, maxDocs=44421)
               0.0625 = fieldNorm(doc=292)
         0.056670498 = weight(abstract_txt:performance in 292) [ClassicSimilarity], result of:
           0.056670498 = score(doc=292,freq=5.0), product of:
             0.08777537 = queryWeight, product of:
               1.2008523 = boost
               4.619759 = idf(docFreq=1189, maxDocs=44421)
               0.015822086 = queryNorm
             0.64563096 = fieldWeight in 292, product of:
               2.236068 = tf(freq=5.0), with freq of:
                 5.0 = termFreq=5.0
               4.619759 = idf(docFreq=1189, maxDocs=44421)
               0.0625 = fieldNorm(doc=292)
         0.03779927 = weight(abstract_txt:different in 292) [ClassicSimilarity], result of:
           0.03779927 = score(doc=292,freq=4.0), product of:
             0.082627386 = queryWeight, product of:
               1.426957 = boost
               3.6597328 = idf(docFreq=3107, maxDocs=44421)
               0.015822086 = queryNorm
             0.4574666 = fieldWeight in 292, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               3.6597328 = idf(docFreq=3107, maxDocs=44421)
               0.0625 = fieldNorm(doc=292)
         0.061331518 = weight(abstract_txt:methods in 292) [ClassicSimilarity], result of:
           0.061331518 = score(doc=292,freq=5.0), product of:
             0.1059142 = queryWeight, product of:
               1.6155707 = boost
               4.1434727 = idf(docFreq=1915, maxDocs=44421)
               0.015822086 = queryNorm
             0.57906795 = fieldWeight in 292, product of:
               2.236068 = tf(freq=5.0), with freq of:
                 5.0 = termFreq=5.0
               4.1434727 = idf(docFreq=1915, maxDocs=44421)
               0.0625 = fieldNorm(doc=292)
         0.12192293 = weight(abstract_txt:weighted in 292) [ClassicSimilarity], result of:
           0.12192293 = score(doc=292,freq=2.0), product of:
             0.19853555 = queryWeight, product of:
               1.8060193 = boost
               6.9478774 = idf(docFreq=115, maxDocs=44421)
               0.015822086 = queryNorm
             0.61411136 = fieldWeight in 292, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               6.9478774 = idf(docFreq=115, maxDocs=44421)
               0.0625 = fieldNorm(doc=292)
         0.17438322 = weight(abstract_txt:weighting in 292) [ClassicSimilarity], result of:
           0.17438322 = score(doc=292,freq=4.0), product of:
             0.20003583 = queryWeight, product of:
               1.8128302 = boost
               6.9740796 = idf(docFreq=112, maxDocs=44421)
               0.015822086 = queryNorm
             0.87175995 = fieldWeight in 292, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               6.9740796 = idf(docFreq=112, maxDocs=44421)
               0.0625 = fieldNorm(doc=292)
         0.050303623 = weight(abstract_txt:proposed in 292) [ClassicSimilarity], result of:
           0.050303623 = score(doc=292,freq=1.0), product of:
             0.17466296 = queryWeight, product of:
               2.395624 = boost
               4.608063 = idf(docFreq=1203, maxDocs=44421)
               0.015822086 = queryNorm
             0.28800395 = fieldWeight in 292, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.608063 = idf(docFreq=1203, maxDocs=44421)
               0.0625 = fieldNorm(doc=292)
         0.06994586 = weight(abstract_txt:journal in 292) [ClassicSimilarity], result of:
           0.06994586 = score(doc=292,freq=1.0), product of:
             0.21759187 = queryWeight, product of:
               2.6738656 = boost
               5.14327 = idf(docFreq=704, maxDocs=44421)
               0.015822086 = queryNorm
             0.32145438 = fieldWeight in 292, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.14327 = idf(docFreq=704, maxDocs=44421)
               0.0625 = fieldNorm(doc=292)
       0.32 = coord(8/25)
   

5. He, J.; Meij, E.; Rijke, M. de: Result diversification based on query-specific cluster ranking (2011) 0.18

   0.17838529 = sum of:
     0.17838529 = product of:
       0.55745405 = sum of:
         0.063829966 = weight(abstract_txt:framework in 355) [ClassicSimilarity], result of:
           0.063829966 = score(doc=355,freq=7.0), product of:
             0.08493924 = queryWeight, product of:
               1.1812924 = boost
               4.5445113 = idf(docFreq=1282, maxDocs=44421)
               0.015822086 = queryNorm
             0.7514779 = fieldWeight in 355, product of:
               2.6457512 = tf(freq=7.0), with freq of:
                 7.0 = termFreq=7.0
               4.5445113 = idf(docFreq=1282, maxDocs=44421)
               0.0625 = fieldNorm(doc=355)
         0.04389678 = weight(abstract_txt:performance in 355) [ClassicSimilarity], result of:
           0.04389678 = score(doc=355,freq=3.0), product of:
             0.08777537 = queryWeight, product of:
               1.2008523 = boost
               4.619759 = idf(docFreq=1189, maxDocs=44421)
               0.015822086 = queryNorm
             0.5001036 = fieldWeight in 355, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               4.619759 = idf(docFreq=1189, maxDocs=44421)
               0.0625 = fieldNorm(doc=355)
         0.03494402 = weight(abstract_txt:propose in 355) [ClassicSimilarity], result of:
           0.03494402 = score(doc=355,freq=1.0), product of:
             0.10873597 = queryWeight, product of:
               1.3365643 = boost
               5.1418524 = idf(docFreq=705, maxDocs=44421)
               0.015822086 = queryNorm
             0.32136577 = fieldWeight in 355, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.1418524 = idf(docFreq=705, maxDocs=44421)
               0.0625 = fieldNorm(doc=355)
         0.018899634 = weight(abstract_txt:different in 355) [ClassicSimilarity], result of:
           0.018899634 = score(doc=355,freq=1.0), product of:
             0.082627386 = queryWeight, product of:
               1.426957 = boost
               3.6597328 = idf(docFreq=3107, maxDocs=44421)
               0.015822086 = queryNorm
             0.2287333 = fieldWeight in 355, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.6597328 = idf(docFreq=3107, maxDocs=44421)
               0.0625 = fieldNorm(doc=355)
         0.027428286 = weight(abstract_txt:methods in 355) [ClassicSimilarity], result of:
           0.027428286 = score(doc=355,freq=1.0), product of:
             0.1059142 = queryWeight, product of:
               1.6155707 = boost
               4.1434727 = idf(docFreq=1915, maxDocs=44421)
               0.015822086 = queryNorm
             0.25896704 = fieldWeight in 355, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.1434727 = idf(docFreq=1915, maxDocs=44421)
               0.0625 = fieldNorm(doc=355)
         0.033802122 = weight(abstract_txt:large in 355) [ClassicSimilarity], result of:
           0.033802122 = score(doc=355,freq=1.0), product of:
             0.121744975 = queryWeight, product of:
               1.7321057 = boost
               4.4423513 = idf(docFreq=1420, maxDocs=44421)
               0.015822086 = queryNorm
             0.27764696 = fieldWeight in 355, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.4423513 = idf(docFreq=1420, maxDocs=44421)
               0.0625 = fieldNorm(doc=355)
         0.08712843 = weight(abstract_txt:proposed in 355) [ClassicSimilarity], result of:
           0.08712843 = score(doc=355,freq=3.0), product of:
             0.17466296 = queryWeight, product of:
               2.395624 = boost
               4.608063 = idf(docFreq=1203, maxDocs=44421)
               0.015822086 = queryNorm
             0.49883747 = fieldWeight in 355, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               4.608063 = idf(docFreq=1203, maxDocs=44421)
               0.0625 = fieldNorm(doc=355)
         0.24752478 = weight(abstract_txt:clustering in 355) [ClassicSimilarity], result of:
           0.24752478 = score(doc=355,freq=1.0), product of:
             0.6366349 = queryWeight, product of:
               6.468126 = boost
               6.2208285 = idf(docFreq=239, maxDocs=44421)
               0.015822086 = queryNorm
             0.38880178 = fieldWeight in 355, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.2208285 = idf(docFreq=239, maxDocs=44421)
               0.0625 = fieldNorm(doc=355)
       0.32 = coord(8/25)