Document (#27588)

Author

Tombros, A.
Villa, R.
Rijsbergen, C.J. Van

Title

¬The effectiveness of query-specific hierarchic clustering in information retrieval

Source

Information processing and management. 38(2002) no.4, S.559-582

Year

2002

Abstract

Hierarchic document clustering has been widely applied to information retrieval (IR) on the grounds of its potential improved effectiveness over inverted file search (IFS). However, previous research has been inconclusive as to whether clustering does bring improvements. In this paper we take the view that if hierarchic clustering is applied to search results (query-specific clustering), then it has the potential to increase the retrieval effectiveness compared both to that of static clustering and of conventional IFS. We conducted a number of experiments using five document collections and four hierarchic clustering methods. Our results show that the effectiveness of query-specific clustering is indeed higher, and suggest that there is scope for its application to IR.

Similar documents (author)

1. Tombros, T.; Crestani, F.: Users' perception of relevance of spoken documents (2000) 1.86

   1.864708 = sum of:
     1.864708 = product of:
       3.729416 = sum of:
         3.729416 = weight(author_txt:tombros in 5997) [ClassicSimilarity], result of:
           3.729416 = score(doc=5997,freq=1.0), product of:
             0.78798807 = queryWeight, product of:
               1.1313021 = boost
               9.465666 = idf(docFreq=8, maxDocs=42740)
               0.0735851 = queryNorm
             4.732833 = fieldWeight in 5997, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               9.465666 = idf(docFreq=8, maxDocs=42740)
               0.5 = fieldNorm(doc=5997)
       0.5 = coord(1/2)
   

2. Tao, Y.; Tombros, A.: How collaborators make sense of tasks together : a comparative analysis of collaborative sensemaking behavior in collaborative information-seeking tasks (2017) 1.86

   1.864708 = sum of:
     1.864708 = product of:
       3.729416 = sum of:
         3.729416 = weight(author_txt:tombros in 5430) [ClassicSimilarity], result of:
           3.729416 = score(doc=5430,freq=1.0), product of:
             0.78798807 = queryWeight, product of:
               1.1313021 = boost
               9.465666 = idf(docFreq=8, maxDocs=42740)
               0.0735851 = queryNorm
             4.732833 = fieldWeight in 5430, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               9.465666 = idf(docFreq=8, maxDocs=42740)
               0.5 = fieldNorm(doc=5430)
       0.5 = coord(1/2)
   

3. Tombros, A.; Ruthven, I.; Jose, J.M.: How users assess Web pages for information seeking (2005) 1.40

   1.398531 = sum of:
     1.398531 = product of:
       2.797062 = sum of:
         2.797062 = weight(author_txt:tombros in 256) [ClassicSimilarity], result of:
           2.797062 = score(doc=256,freq=1.0), product of:
             0.78798807 = queryWeight, product of:
               1.1313021 = boost
               9.465666 = idf(docFreq=8, maxDocs=42740)
               0.0735851 = queryNorm
             3.5496247 = fieldWeight in 256, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               9.465666 = idf(docFreq=8, maxDocs=42740)
               0.375 = fieldNorm(doc=256)
       0.5 = coord(1/2)
   

4. Sahib, N.G.; Tombros, A.; Stockman, T.: ¬A comparative analysis of the information-seeking behavior of visually impaired and sighted searchers (2012) 1.40

   1.398531 = sum of:
     1.398531 = product of:
       2.797062 = sum of:
         2.797062 = weight(author_txt:tombros in 1990) [ClassicSimilarity], result of:
           2.797062 = score(doc=1990,freq=1.0), product of:
             0.78798807 = queryWeight, product of:
               1.1313021 = boost
               9.465666 = idf(docFreq=8, maxDocs=42740)
               0.0735851 = queryNorm
             3.5496247 = fieldWeight in 1990, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               9.465666 = idf(docFreq=8, maxDocs=42740)
               0.375 = fieldNorm(doc=1990)
       0.5 = coord(1/2)
   

5. Sahib, N.G.; Tombros, A.; Stockman, T.: Investigating the behavior of visually impaired users for multi-session search tasks (2014) 1.40

   1.398531 = sum of:
     1.398531 = product of:
       2.797062 = sum of:
         2.797062 = weight(author_txt:tombros in 3182) [ClassicSimilarity], result of:
           2.797062 = score(doc=3182,freq=1.0), product of:
             0.78798807 = queryWeight, product of:
               1.1313021 = boost
               9.465666 = idf(docFreq=8, maxDocs=42740)
               0.0735851 = queryNorm
             3.5496247 = fieldWeight in 3182, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               9.465666 = idf(docFreq=8, maxDocs=42740)
               0.375 = fieldNorm(doc=3182)
       0.5 = coord(1/2)
   

Similar documents (content)

1. Kirriemuir, J.W.; Willet, P.: Identification of duplicate and near-duplicate full-text records in database search-outputs using hierarchic cluster analysis (1995) 0.50

   0.5043276 = sum of:
     0.5043276 = product of:
       2.101365 = sum of:
         0.015095448 = weight(abstract_txt:results in 2498) [ClassicSimilarity], result of:
           0.015095448 = score(doc=2498,freq=1.0), product of:
             0.04591019 = queryWeight, product of:
               1.243291 = boost
               3.5072412 = idf(docFreq=3482, maxDocs=42740)
               0.010528602 = queryNorm
             0.32880387 = fieldWeight in 2498, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.5072412 = idf(docFreq=3482, maxDocs=42740)
               0.09375 = fieldNorm(doc=2498)
         0.016829796 = weight(abstract_txt:been in 2498) [ClassicSimilarity], result of:
           0.016829796 = score(doc=2498,freq=1.0), product of:
             0.04936256 = queryWeight, product of:
               1.2891904 = boost
               3.6367204 = idf(docFreq=3059, maxDocs=42740)
               0.010528602 = queryNorm
             0.34094253 = fieldWeight in 2498, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.6367204 = idf(docFreq=3059, maxDocs=42740)
               0.09375 = fieldNorm(doc=2498)
         0.029507766 = weight(abstract_txt:search in 2498) [ClassicSimilarity], result of:
           0.029507766 = score(doc=2498,freq=3.0), product of:
             0.04976556 = queryWeight, product of:
               1.2944422 = boost
               3.6515355 = idf(docFreq=3014, maxDocs=42740)
               0.010528602 = queryNorm
             0.59293544 = fieldWeight in 2498, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               3.6515355 = idf(docFreq=3014, maxDocs=42740)
               0.09375 = fieldNorm(doc=2498)
         0.019219404 = weight(abstract_txt:that in 2498) [ClassicSimilarity], result of:
           0.019219404 = score(doc=2498,freq=4.0), product of:
             0.042805053 = queryWeight, product of:
               1.6977774 = boost
               2.3946586 = idf(docFreq=10595, maxDocs=42740)
               0.010528602 = queryNorm
             0.44899848 = fieldWeight in 2498, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               2.3946586 = idf(docFreq=10595, maxDocs=42740)
               0.09375 = fieldNorm(doc=2498)
         1.437214 = weight(title_txt:hierarchic in 2498) [ClassicSimilarity], result of:
           1.437214 = score(doc=2498,freq=1.0), product of:
             0.6855696 = queryWeight, product of:
               6.7945232 = boost
               9.583449 = idf(docFreq=7, maxDocs=42740)
               0.010528602 = queryNorm
             2.0963795 = fieldWeight in 2498, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               9.583449 = idf(docFreq=7, maxDocs=42740)
               0.21875 = fieldNorm(doc=2498)
         0.5834988 = weight(abstract_txt:clustering in 2498) [ClassicSimilarity], result of:
           0.5834988 = score(doc=2498,freq=3.0), product of:
             0.5776764 = queryWeight, product of:
               8.820446 = boost
               6.220473 = idf(docFreq=230, maxDocs=42740)
               0.010528602 = queryNorm
             1.0100789 = fieldWeight in 2498, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               6.220473 = idf(docFreq=230, maxDocs=42740)
               0.09375 = fieldNorm(doc=2498)
       0.24 = coord(6/25)
   

2. Burgin, R.: ¬The retrieval effectiveness of 5 clustering algorithms as a function of indexing exhaustivity (1995) 0.26

   0.2608186 = sum of:
     0.2608186 = product of:
       0.8150582 = sum of:
         0.020945774 = weight(abstract_txt:widely in 3434) [ClassicSimilarity], result of:
           0.020945774 = score(doc=3434,freq=1.0), product of:
             0.059400972 = queryWeight, product of:
               5.641867 = idf(docFreq=411, maxDocs=42740)
               0.010528602 = queryNorm
             0.3526167 = fieldWeight in 3434, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.641867 = idf(docFreq=411, maxDocs=42740)
               0.0625 = fieldNorm(doc=3434)
         0.028310757 = weight(abstract_txt:improvements in 3434) [ClassicSimilarity], result of:
           0.028310757 = score(doc=3434,freq=1.0), product of:
             0.07261565 = queryWeight, product of:
               1.1056517 = boost
               6.2379403 = idf(docFreq=226, maxDocs=42740)
               0.010528602 = queryNorm
             0.38987127 = fieldWeight in 3434, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.2379403 = idf(docFreq=226, maxDocs=42740)
               0.0625 = fieldNorm(doc=3434)
         0.011357545 = weight(abstract_txt:search in 3434) [ClassicSimilarity], result of:
           0.011357545 = score(doc=3434,freq=1.0), product of:
             0.04976556 = queryWeight, product of:
               1.2944422 = boost
               3.6515355 = idf(docFreq=3014, maxDocs=42740)
               0.010528602 = queryNorm
             0.22822097 = fieldWeight in 3434, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.6515355 = idf(docFreq=3014, maxDocs=42740)
               0.0625 = fieldNorm(doc=3434)
         0.03169443 = weight(abstract_txt:document in 3434) [ClassicSimilarity], result of:
           0.03169443 = score(doc=3434,freq=3.0), product of:
             0.068394445 = queryWeight, product of:
               1.5174998 = boost
               4.280766 = idf(docFreq=1606, maxDocs=42740)
               0.010528602 = queryNorm
             0.4634065 = fieldWeight in 3434, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               4.280766 = idf(docFreq=1606, maxDocs=42740)
               0.0625 = fieldNorm(doc=3434)
         0.009060114 = weight(abstract_txt:that in 3434) [ClassicSimilarity], result of:
           0.009060114 = score(doc=3434,freq=2.0), product of:
             0.042805053 = queryWeight, product of:
               1.6977774 = boost
               2.3946586 = idf(docFreq=10595, maxDocs=42740)
               0.010528602 = queryNorm
             0.21165991 = fieldWeight in 3434, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               2.3946586 = idf(docFreq=10595, maxDocs=42740)
               0.0625 = fieldNorm(doc=3434)
         0.03850642 = weight(abstract_txt:retrieval in 3434) [ClassicSimilarity], result of:
           0.03850642 = score(doc=3434,freq=7.0), product of:
             0.06720874 = queryWeight, product of:
               1.8423694 = boost
               3.4648013 = idf(docFreq=3633, maxDocs=42740)
               0.010528602 = queryNorm
             0.57293767 = fieldWeight in 3434, product of:
               2.6457512 = tf(freq=7.0), with freq of:
                 7.0 = termFreq=7.0
               3.4648013 = idf(docFreq=3633, maxDocs=42740)
               0.0625 = fieldNorm(doc=3434)
         0.12505521 = weight(abstract_txt:effectiveness in 3434) [ClassicSimilarity], result of:
           0.12505521 = score(doc=3434,freq=4.0), product of:
             0.19549266 = queryWeight, product of:
               3.6282604 = boost
               5.117541 = idf(docFreq=695, maxDocs=42740)
               0.010528602 = queryNorm
             0.6396926 = fieldWeight in 3434, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               5.117541 = idf(docFreq=695, maxDocs=42740)
               0.0625 = fieldNorm(doc=3434)
         0.5501279 = weight(abstract_txt:clustering in 3434) [ClassicSimilarity], result of:
           0.5501279 = score(doc=3434,freq=6.0), product of:
             0.5776764 = queryWeight, product of:
               8.820446 = boost
               6.220473 = idf(docFreq=230, maxDocs=42740)
               0.010528602 = queryNorm
             0.9523116 = fieldWeight in 3434, product of:
               2.4494898 = tf(freq=6.0), with freq of:
                 6.0 = termFreq=6.0
               6.220473 = idf(docFreq=230, maxDocs=42740)
               0.0625 = fieldNorm(doc=3434)
       0.32 = coord(8/25)
   

3. Baeza-Yates, R.; Hurtado, C.; Mendoza, M.: Improving search engines by query clustering (2007) 0.22

   0.22332756 = sum of:
     0.22332756 = product of:
       0.9305315 = sum of:
         0.029507766 = weight(abstract_txt:search in 2602) [ClassicSimilarity], result of:
           0.029507766 = score(doc=2602,freq=3.0), product of:
             0.04976556 = queryWeight, product of:
               1.2944422 = boost
               3.6515355 = idf(docFreq=3014, maxDocs=42740)
               0.010528602 = queryNorm
             0.59293544 = fieldWeight in 2602, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               3.6515355 = idf(docFreq=3014, maxDocs=42740)
               0.09375 = fieldNorm(doc=2602)
         0.027448183 = weight(abstract_txt:document in 2602) [ClassicSimilarity], result of:
           0.027448183 = score(doc=2602,freq=1.0), product of:
             0.068394445 = queryWeight, product of:
               1.5174998 = boost
               4.280766 = idf(docFreq=1606, maxDocs=42740)
               0.010528602 = queryNorm
             0.40132183 = fieldWeight in 2602, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.280766 = idf(docFreq=1606, maxDocs=42740)
               0.09375 = fieldNorm(doc=2602)
         0.009609702 = weight(abstract_txt:that in 2602) [ClassicSimilarity], result of:
           0.009609702 = score(doc=2602,freq=1.0), product of:
             0.042805053 = queryWeight, product of:
               1.6977774 = boost
               2.3946586 = idf(docFreq=10595, maxDocs=42740)
               0.010528602 = queryNorm
             0.22449924 = fieldWeight in 2602, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               2.3946586 = idf(docFreq=10595, maxDocs=42740)
               0.09375 = fieldNorm(doc=2602)
         0.096408054 = weight(abstract_txt:query in 2602) [ClassicSimilarity], result of:
           0.096408054 = score(doc=2602,freq=3.0), product of:
             0.12543267 = queryWeight, product of:
               2.5169187 = boost
               4.7333736 = idf(docFreq=1021, maxDocs=42740)
               0.010528602 = queryNorm
             0.76860404 = fieldWeight in 2602, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               4.7333736 = idf(docFreq=1021, maxDocs=42740)
               0.09375 = fieldNorm(doc=2602)
         0.09379141 = weight(abstract_txt:effectiveness in 2602) [ClassicSimilarity], result of:
           0.09379141 = score(doc=2602,freq=1.0), product of:
             0.19549266 = queryWeight, product of:
               3.6282604 = boost
               5.117541 = idf(docFreq=695, maxDocs=42740)
               0.010528602 = queryNorm
             0.47976947 = fieldWeight in 2602, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.117541 = idf(docFreq=695, maxDocs=42740)
               0.09375 = fieldNorm(doc=2602)
         0.6737664 = weight(abstract_txt:clustering in 2602) [ClassicSimilarity], result of:
           0.6737664 = score(doc=2602,freq=4.0), product of:
             0.5776764 = queryWeight, product of:
               8.820446 = boost
               6.220473 = idf(docFreq=230, maxDocs=42740)
               0.010528602 = queryNorm
             1.1663387 = fieldWeight in 2602, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               6.220473 = idf(docFreq=230, maxDocs=42740)
               0.09375 = fieldNorm(doc=2602)
       0.24 = coord(6/25)
   

4. Kishida, K.: High-speed rough clustering for very large document collections (2010) 0.21

   0.20945977 = sum of:
     0.20945977 = product of:
       0.7480706 = sum of:
         0.020945774 = weight(abstract_txt:widely in 464) [ClassicSimilarity], result of:
           0.020945774 = score(doc=464,freq=1.0), product of:
             0.059400972 = queryWeight, product of:
               5.641867 = idf(docFreq=411, maxDocs=42740)
               0.010528602 = queryNorm
             0.3526167 = fieldWeight in 464, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.641867 = idf(docFreq=411, maxDocs=42740)
               0.0625 = fieldNorm(doc=464)
         0.021220636 = weight(abstract_txt:improved in 464) [ClassicSimilarity], result of:
           0.021220636 = score(doc=464,freq=1.0), product of:
             0.059919503 = queryWeight, product of:
               1.0043552 = boost
               5.6664386 = idf(docFreq=401, maxDocs=42740)
               0.010528602 = queryNorm
             0.3541524 = fieldWeight in 464, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.6664386 = idf(docFreq=401, maxDocs=42740)
               0.0625 = fieldNorm(doc=464)
         0.014232125 = weight(abstract_txt:results in 464) [ClassicSimilarity], result of:
           0.014232125 = score(doc=464,freq=2.0), product of:
             0.04591019 = queryWeight, product of:
               1.243291 = boost
               3.5072412 = idf(docFreq=3482, maxDocs=42740)
               0.010528602 = queryNorm
             0.30999926 = fieldWeight in 464, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               3.5072412 = idf(docFreq=3482, maxDocs=42740)
               0.0625 = fieldNorm(doc=464)
         0.025878396 = weight(abstract_txt:document in 464) [ClassicSimilarity], result of:
           0.025878396 = score(doc=464,freq=2.0), product of:
             0.068394445 = queryWeight, product of:
               1.5174998 = boost
               4.280766 = idf(docFreq=1606, maxDocs=42740)
               0.010528602 = queryNorm
             0.37836984 = fieldWeight in 464, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               4.280766 = idf(docFreq=1606, maxDocs=42740)
               0.0625 = fieldNorm(doc=464)
         0.009060114 = weight(abstract_txt:that in 464) [ClassicSimilarity], result of:
           0.009060114 = score(doc=464,freq=2.0), product of:
             0.042805053 = queryWeight, product of:
               1.6977774 = boost
               2.3946586 = idf(docFreq=10595, maxDocs=42740)
               0.010528602 = queryNorm
             0.21165991 = fieldWeight in 464, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               2.3946586 = idf(docFreq=10595, maxDocs=42740)
               0.0625 = fieldNorm(doc=464)
         0.062527604 = weight(abstract_txt:effectiveness in 464) [ClassicSimilarity], result of:
           0.062527604 = score(doc=464,freq=1.0), product of:
             0.19549266 = queryWeight, product of:
               3.6282604 = boost
               5.117541 = idf(docFreq=695, maxDocs=42740)
               0.010528602 = queryNorm
             0.3198463 = fieldWeight in 464, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.117541 = idf(docFreq=695, maxDocs=42740)
               0.0625 = fieldNorm(doc=464)
         0.594206 = weight(abstract_txt:clustering in 464) [ClassicSimilarity], result of:
           0.594206 = score(doc=464,freq=7.0), product of:
             0.5776764 = queryWeight, product of:
               8.820446 = boost
               6.220473 = idf(docFreq=230, maxDocs=42740)
               0.010528602 = queryNorm
             1.0286139 = fieldWeight in 464, product of:
               2.6457512 = tf(freq=7.0), with freq of:
                 7.0 = termFreq=7.0
               6.220473 = idf(docFreq=230, maxDocs=42740)
               0.0625 = fieldNorm(doc=464)
       0.28 = coord(7/25)
   

5. Park, G.; Baek, Y.; Lee, H.-K.: Re-ranking algorithm using post-retrieval clustering for content-based image retrieval (2005) 0.20

   0.20242716 = sum of:
     0.20242716 = product of:
       0.72295415 = sum of:
         0.029121334 = weight(abstract_txt:conventional in 3006) [ClassicSimilarity], result of:
           0.029121334 = score(doc=3006,freq=1.0), product of:
             0.07399518 = queryWeight, product of:
               1.1161047 = boost
               6.2969146 = idf(docFreq=213, maxDocs=42740)
               0.010528602 = queryNorm
             0.39355716 = fieldWeight in 3006, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.2969146 = idf(docFreq=213, maxDocs=42740)
               0.0625 = fieldNorm(doc=3006)
         0.020127265 = weight(abstract_txt:results in 3006) [ClassicSimilarity], result of:
           0.020127265 = score(doc=3006,freq=4.0), product of:
             0.04591019 = queryWeight, product of:
               1.243291 = boost
               3.5072412 = idf(docFreq=3482, maxDocs=42740)
               0.010528602 = queryNorm
             0.43840516 = fieldWeight in 3006, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               3.5072412 = idf(docFreq=3482, maxDocs=42740)
               0.0625 = fieldNorm(doc=3006)
         0.009060114 = weight(abstract_txt:that in 3006) [ClassicSimilarity], result of:
           0.009060114 = score(doc=3006,freq=2.0), product of:
             0.042805053 = queryWeight, product of:
               1.6977774 = boost
               2.3946586 = idf(docFreq=10595, maxDocs=42740)
               0.010528602 = queryNorm
             0.21165991 = fieldWeight in 3006, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               2.3946586 = idf(docFreq=10595, maxDocs=42740)
               0.0625 = fieldNorm(doc=3006)
         0.035650015 = weight(abstract_txt:retrieval in 3006) [ClassicSimilarity], result of:
           0.035650015 = score(doc=3006,freq=6.0), product of:
             0.06720874 = queryWeight, product of:
               1.8423694 = boost
               3.4648013 = idf(docFreq=3633, maxDocs=42740)
               0.010528602 = queryNorm
             0.53043723 = fieldWeight in 3006, product of:
               2.4494898 = tf(freq=6.0), with freq of:
                 6.0 = termFreq=6.0
               3.4648013 = idf(docFreq=3633, maxDocs=42740)
               0.0625 = fieldNorm(doc=3006)
         0.06427204 = weight(abstract_txt:query in 3006) [ClassicSimilarity], result of:
           0.06427204 = score(doc=3006,freq=3.0), product of:
             0.12543267 = queryWeight, product of:
               2.5169187 = boost
               4.7333736 = idf(docFreq=1021, maxDocs=42740)
               0.010528602 = queryNorm
             0.5124027 = fieldWeight in 3006, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               4.7333736 = idf(docFreq=1021, maxDocs=42740)
               0.0625 = fieldNorm(doc=3006)
         0.062527604 = weight(abstract_txt:effectiveness in 3006) [ClassicSimilarity], result of:
           0.062527604 = score(doc=3006,freq=1.0), product of:
             0.19549266 = queryWeight, product of:
               3.6282604 = boost
               5.117541 = idf(docFreq=695, maxDocs=42740)
               0.010528602 = queryNorm
             0.3198463 = fieldWeight in 3006, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.117541 = idf(docFreq=695, maxDocs=42740)
               0.0625 = fieldNorm(doc=3006)
         0.5021958 = weight(abstract_txt:clustering in 3006) [ClassicSimilarity], result of:
           0.5021958 = score(doc=3006,freq=5.0), product of:
             0.5776764 = queryWeight, product of:
               8.820446 = boost
               6.220473 = idf(docFreq=230, maxDocs=42740)
               0.010528602 = queryNorm
             0.8693375 = fieldWeight in 3006, product of:
               2.236068 = tf(freq=5.0), with freq of:
                 5.0 = termFreq=5.0
               6.220473 = idf(docFreq=230, maxDocs=42740)
               0.0625 = fieldNorm(doc=3006)
       0.28 = coord(7/25)