Document (#36108)

Author

Leydesdorff, L.
Opthof, T.

Title

Scopus's source normalized impact per paper (SNIP) versus a journal impact factor based on fractional counting of citations

Source

Journal of the American Society for Information Science and Technology. 61(2010) no.11, S.2365-2369

Year

2010

Series

Brief Communication

Abstract

Impact factors (and similar measures such as the Scimago Journal Rankings) suffer from two problems: (a) citation behavior varies among fields of science and, therefore, leads to systematic differences, and (b) there are no statistics to inform us whether differences are significant. The recently introduced "source normalized impact per paper" indicator of Scopus tries to remedy the first of these two problems, but a number of normalization decisions are involved, which makes it impossible to test for significance. Using fractional counting of citations-based on the assumption that impact is proportionate to the number of references in the citing documents-citations can be contextualized at the paper level and aggregated impacts of sets can be tested for their significance. It can be shown that the weighted impact of Annals of Mathematics (0.247) is not so much lower than that of Molecular Cell (0.386) despite a five-f old difference between their impact factors (2.793 and 13.156, respectively).

Theme

Informetrie

Object

Scopus

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.; Bornmann, L.: How fractional counting of citations affects the impact factor : normalization in terms of differences in citation potentials among fields of science (2011) 0.46

   0.46044332 = sum of:
     0.46044332 = product of:
       1.1511083 = sum of:
         0.07090183 = weight(abstract_txt:normalization in 186) [ClassicSimilarity], result of:
           0.07090183 = score(doc=186,freq=1.0), product of:
             0.14945199 = queryWeight, product of:
               1.0556262 = boost
               7.590594 = idf(docFreq=60, maxDocs=44421)
               0.018651586 = queryNorm
             0.4744121 = fieldWeight in 186, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.590594 = idf(docFreq=60, maxDocs=44421)
               0.0625 = fieldNorm(doc=186)
         0.088574864 = weight(abstract_txt:suffer in 186) [ClassicSimilarity], result of:
           0.088574864 = score(doc=186,freq=1.0), product of:
             0.17335527 = queryWeight, product of:
               1.1369146 = boost
               8.175107 = idf(docFreq=33, maxDocs=44421)
               0.018651586 = queryNorm
             0.5109442 = fieldWeight in 186, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               8.175107 = idf(docFreq=33, maxDocs=44421)
               0.0625 = fieldNorm(doc=186)
         0.022935025 = weight(abstract_txt:number in 186) [ClassicSimilarity], result of:
           0.022935025 = score(doc=186,freq=1.0), product of:
             0.088730484 = queryWeight, product of:
               1.150299 = boost
               4.1356745 = idf(docFreq=1930, maxDocs=44421)
               0.018651586 = queryNorm
             0.25847965 = fieldWeight in 186, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.1356745 = idf(docFreq=1930, maxDocs=44421)
               0.0625 = fieldNorm(doc=186)
         0.039418213 = weight(abstract_txt:factors in 186) [ClassicSimilarity], result of:
           0.039418213 = score(doc=186,freq=1.0), product of:
             0.12731259 = queryWeight, product of:
               1.3778754 = boost
               4.9538813 = idf(docFreq=851, maxDocs=44421)
               0.018651586 = queryNorm
             0.30961758 = fieldWeight in 186, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.9538813 = idf(docFreq=851, maxDocs=44421)
               0.0625 = fieldNorm(doc=186)
         0.08814181 = weight(abstract_txt:differences in 186) [ClassicSimilarity], result of:
           0.08814181 = score(doc=186,freq=5.0), product of:
             0.12731259 = queryWeight, product of:
               1.3778754 = boost
               4.9538813 = idf(docFreq=851, maxDocs=44421)
               0.018651586 = queryNorm
             0.69232595 = fieldWeight in 186, product of:
               2.236068 = tf(freq=5.0), with freq of:
                 5.0 = termFreq=5.0
               4.9538813 = idf(docFreq=851, maxDocs=44421)
               0.0625 = fieldNorm(doc=186)
         0.11508458 = weight(abstract_txt:significance in 186) [ClassicSimilarity], result of:
           0.11508458 = score(doc=186,freq=2.0), product of:
             0.2064151 = queryWeight, product of:
               1.7544663 = boost
               6.30784 = idf(docFreq=219, maxDocs=44421)
               0.018651586 = queryNorm
             0.5575395 = fieldWeight in 186, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               6.30784 = idf(docFreq=219, maxDocs=44421)
               0.0625 = fieldNorm(doc=186)
         0.13580203 = weight(abstract_txt:normalized in 186) [ClassicSimilarity], result of:
           0.13580203 = score(doc=186,freq=1.0), product of:
             0.29040954 = queryWeight, product of:
               2.0810368 = boost
               7.48196 = idf(docFreq=67, maxDocs=44421)
               0.018651586 = queryNorm
             0.4676225 = fieldWeight in 186, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.48196 = idf(docFreq=67, maxDocs=44421)
               0.0625 = fieldNorm(doc=186)
         0.20185359 = weight(abstract_txt:counting in 186) [ClassicSimilarity], result of:
           0.20185359 = score(doc=186,freq=2.0), product of:
             0.30020717 = queryWeight, product of:
               2.1158497 = boost
               7.607123 = idf(docFreq=59, maxDocs=44421)
               0.018651586 = queryNorm
             0.672381 = fieldWeight in 186, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               7.607123 = idf(docFreq=59, maxDocs=44421)
               0.0625 = fieldNorm(doc=186)
         0.27987286 = weight(abstract_txt:fractional in 186) [ClassicSimilarity], result of:
           0.27987286 = score(doc=186,freq=2.0), product of:
             0.37328216 = queryWeight, product of:
               2.359353 = boost
               8.482592 = idf(docFreq=24, maxDocs=44421)
               0.018651586 = queryNorm
             0.74976224 = fieldWeight in 186, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               8.482592 = idf(docFreq=24, maxDocs=44421)
               0.0625 = fieldNorm(doc=186)
         0.10852349 = weight(abstract_txt:impact in 186) [ClassicSimilarity], result of:
           0.10852349 = score(doc=186,freq=1.0), product of:
             0.37970403 = queryWeight, product of:
               4.4517517 = boost
               4.572972 = idf(docFreq=1246, maxDocs=44421)
               0.018651586 = queryNorm
             0.28581074 = fieldWeight in 186, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.572972 = idf(docFreq=1246, maxDocs=44421)
               0.0625 = fieldNorm(doc=186)
       0.4 = coord(10/25)
   

2. Zitt, M.; Small, H.: Modifying the journal impact factor by fractional citation weighting : the audience factor (2008) 0.37

   0.36739227 = sum of:
     0.36739227 = product of:
       1.1481009 = sum of:
         0.12533791 = weight(abstract_txt:normalization in 3363) [ClassicSimilarity], result of:
           0.12533791 = score(doc=3363,freq=2.0), product of:
             0.14945199 = queryWeight, product of:
               1.0556262 = boost
               7.590594 = idf(docFreq=60, maxDocs=44421)
               0.018651586 = queryNorm
             0.83865 = fieldWeight in 3363, 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=3363)
         0.040543776 = weight(abstract_txt:number in 3363) [ClassicSimilarity], result of:
           0.040543776 = score(doc=3363,freq=2.0), product of:
             0.088730484 = queryWeight, product of:
               1.150299 = boost
               4.1356745 = idf(docFreq=1930, maxDocs=44421)
               0.018651586 = queryNorm
             0.45693177 = fieldWeight in 3363, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               4.1356745 = idf(docFreq=1930, maxDocs=44421)
               0.078125 = fieldNorm(doc=3363)
         0.06968221 = weight(abstract_txt:factors in 3363) [ClassicSimilarity], result of:
           0.06968221 = score(doc=3363,freq=2.0), product of:
             0.12731259 = queryWeight, product of:
               1.3778754 = boost
               4.9538813 = idf(docFreq=851, maxDocs=44421)
               0.018651586 = queryNorm
             0.5473317 = fieldWeight in 3363, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               4.9538813 = idf(docFreq=851, maxDocs=44421)
               0.078125 = fieldNorm(doc=3363)
         0.12330287 = weight(abstract_txt:journal in 3363) [ClassicSimilarity], result of:
           0.12330287 = score(doc=3363,freq=5.0), product of:
             0.13723308 = queryWeight, product of:
               1.4305522 = boost
               5.14327 = idf(docFreq=704, maxDocs=44421)
               0.018651586 = queryNorm
             0.89849234 = fieldWeight in 3363, product of:
               2.236068 = tf(freq=5.0), with freq of:
                 5.0 = termFreq=5.0
               5.14327 = idf(docFreq=704, maxDocs=44421)
               0.078125 = fieldNorm(doc=3363)
         0.17841506 = weight(abstract_txt:counting in 3363) [ClassicSimilarity], result of:
           0.17841506 = score(doc=3363,freq=1.0), product of:
             0.30020717 = queryWeight, product of:
               2.1158497 = boost
               7.607123 = idf(docFreq=59, maxDocs=44421)
               0.018651586 = queryNorm
             0.59430647 = fieldWeight in 3363, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.607123 = idf(docFreq=59, maxDocs=44421)
               0.078125 = fieldNorm(doc=3363)
         0.09213528 = weight(abstract_txt:citations in 3363) [ClassicSimilarity], result of:
           0.09213528 = score(doc=3363,freq=1.0), product of:
             0.22119795 = queryWeight, product of:
               2.2243876 = boost
               5.331567 = idf(docFreq=583, maxDocs=44421)
               0.018651586 = queryNorm
             0.41652864 = fieldWeight in 3363, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.331567 = idf(docFreq=583, maxDocs=44421)
               0.078125 = fieldNorm(doc=3363)
         0.247375 = weight(abstract_txt:fractional in 3363) [ClassicSimilarity], result of:
           0.247375 = score(doc=3363,freq=1.0), product of:
             0.37328216 = queryWeight, product of:
               2.359353 = boost
               8.482592 = idf(docFreq=24, maxDocs=44421)
               0.018651586 = queryNorm
             0.66270244 = fieldWeight in 3363, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               8.482592 = idf(docFreq=24, maxDocs=44421)
               0.078125 = fieldNorm(doc=3363)
         0.27130872 = weight(abstract_txt:impact in 3363) [ClassicSimilarity], result of:
           0.27130872 = score(doc=3363,freq=4.0), product of:
             0.37970403 = queryWeight, product of:
               4.4517517 = boost
               4.572972 = idf(docFreq=1246, maxDocs=44421)
               0.018651586 = queryNorm
             0.71452683 = fieldWeight in 3363, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               4.572972 = idf(docFreq=1246, maxDocs=44421)
               0.078125 = fieldNorm(doc=3363)
       0.32 = coord(8/25)
   

3. Leydesdorff, L.; Zhou, P.; Bornmann, L.: How can journal impact factors be normalized across fields of science? : An assessment in terms of percentile ranks and fractional counts (2013) 0.28

   0.28350687 = sum of:
     0.28350687 = product of:
       1.0125245 = sum of:
         0.07090183 = weight(abstract_txt:normalization in 1532) [ClassicSimilarity], result of:
           0.07090183 = score(doc=1532,freq=1.0), product of:
             0.14945199 = queryWeight, product of:
               1.0556262 = boost
               7.590594 = idf(docFreq=60, maxDocs=44421)
               0.018651586 = queryNorm
             0.4744121 = fieldWeight in 1532, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.590594 = idf(docFreq=60, maxDocs=44421)
               0.0625 = fieldNorm(doc=1532)
         0.022935025 = weight(abstract_txt:number in 1532) [ClassicSimilarity], result of:
           0.022935025 = score(doc=1532,freq=1.0), product of:
             0.088730484 = queryWeight, product of:
               1.150299 = boost
               4.1356745 = idf(docFreq=1930, maxDocs=44421)
               0.018651586 = queryNorm
             0.25847965 = fieldWeight in 1532, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.1356745 = idf(docFreq=1930, maxDocs=44421)
               0.0625 = fieldNorm(doc=1532)
         0.039418213 = weight(abstract_txt:differences in 1532) [ClassicSimilarity], result of:
           0.039418213 = score(doc=1532,freq=1.0), product of:
             0.12731259 = queryWeight, product of:
               1.3778754 = boost
               4.9538813 = idf(docFreq=851, maxDocs=44421)
               0.018651586 = queryNorm
             0.30961758 = fieldWeight in 1532, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.9538813 = idf(docFreq=851, maxDocs=44421)
               0.0625 = fieldNorm(doc=1532)
         0.13580203 = weight(abstract_txt:normalized in 1532) [ClassicSimilarity], result of:
           0.13580203 = score(doc=1532,freq=1.0), product of:
             0.29040954 = queryWeight, product of:
               2.0810368 = boost
               7.48196 = idf(docFreq=67, maxDocs=44421)
               0.018651586 = queryNorm
             0.4676225 = fieldWeight in 1532, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.48196 = idf(docFreq=67, maxDocs=44421)
               0.0625 = fieldNorm(doc=1532)
         0.24721916 = weight(abstract_txt:counting in 1532) [ClassicSimilarity], result of:
           0.24721916 = score(doc=1532,freq=3.0), product of:
             0.30020717 = queryWeight, product of:
               2.1158497 = boost
               7.607123 = idf(docFreq=59, maxDocs=44421)
               0.018651586 = queryNorm
             0.8234952 = fieldWeight in 1532, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               7.607123 = idf(docFreq=59, maxDocs=44421)
               0.0625 = fieldNorm(doc=1532)
         0.34277287 = weight(abstract_txt:fractional in 1532) [ClassicSimilarity], result of:
           0.34277287 = score(doc=1532,freq=3.0), product of:
             0.37328216 = queryWeight, product of:
               2.359353 = boost
               8.482592 = idf(docFreq=24, maxDocs=44421)
               0.018651586 = queryNorm
             0.9182675 = fieldWeight in 1532, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               8.482592 = idf(docFreq=24, maxDocs=44421)
               0.0625 = fieldNorm(doc=1532)
         0.15347539 = weight(abstract_txt:impact in 1532) [ClassicSimilarity], result of:
           0.15347539 = score(doc=1532,freq=2.0), product of:
             0.37970403 = queryWeight, product of:
               4.4517517 = boost
               4.572972 = idf(docFreq=1246, maxDocs=44421)
               0.018651586 = queryNorm
             0.40419742 = fieldWeight in 1532, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               4.572972 = idf(docFreq=1246, maxDocs=44421)
               0.0625 = fieldNorm(doc=1532)
       0.28 = coord(7/25)
   

4. Leydesdorff, L.; Radicchi, F.; Bornmann, L.; Castellano, C.; Nooy, W. de: Field-normalized impact factors (IFs) : a comparison of rescaling and fractionally counted IFs (2013) 0.27

   0.27089113 = sum of:
     0.27089113 = product of:
       1.128713 = sum of:
         0.12533791 = weight(abstract_txt:normalization in 2108) [ClassicSimilarity], result of:
           0.12533791 = score(doc=2108,freq=2.0), product of:
             0.14945199 = queryWeight, product of:
               1.0556262 = boost
               7.590594 = idf(docFreq=60, maxDocs=44421)
               0.018651586 = queryNorm
             0.83865 = fieldWeight in 2108, 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=2108)
         0.049272764 = weight(abstract_txt:factors in 2108) [ClassicSimilarity], result of:
           0.049272764 = score(doc=2108,freq=1.0), product of:
             0.12731259 = queryWeight, product of:
               1.3778754 = boost
               4.9538813 = idf(docFreq=851, maxDocs=44421)
               0.018651586 = queryNorm
             0.38702196 = fieldWeight in 2108, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.9538813 = idf(docFreq=851, maxDocs=44421)
               0.078125 = fieldNorm(doc=2108)
         0.30902395 = weight(abstract_txt:counting in 2108) [ClassicSimilarity], result of:
           0.30902395 = score(doc=2108,freq=3.0), product of:
             0.30020717 = queryWeight, product of:
               2.1158497 = boost
               7.607123 = idf(docFreq=59, maxDocs=44421)
               0.018651586 = queryNorm
             1.029369 = fieldWeight in 2108, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               7.607123 = idf(docFreq=59, maxDocs=44421)
               0.078125 = fieldNorm(doc=2108)
         0.15958299 = weight(abstract_txt:citations in 2108) [ClassicSimilarity], result of:
           0.15958299 = score(doc=2108,freq=3.0), product of:
             0.22119795 = queryWeight, product of:
               2.2243876 = boost
               5.331567 = idf(docFreq=583, maxDocs=44421)
               0.018651586 = queryNorm
             0.7214488 = fieldWeight in 2108, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               5.331567 = idf(docFreq=583, maxDocs=44421)
               0.078125 = fieldNorm(doc=2108)
         0.3498411 = weight(abstract_txt:fractional in 2108) [ClassicSimilarity], result of:
           0.3498411 = score(doc=2108,freq=2.0), product of:
             0.37328216 = queryWeight, product of:
               2.359353 = boost
               8.482592 = idf(docFreq=24, maxDocs=44421)
               0.018651586 = queryNorm
             0.9372028 = fieldWeight in 2108, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               8.482592 = idf(docFreq=24, maxDocs=44421)
               0.078125 = fieldNorm(doc=2108)
         0.13565436 = weight(abstract_txt:impact in 2108) [ClassicSimilarity], result of:
           0.13565436 = score(doc=2108,freq=1.0), product of:
             0.37970403 = queryWeight, product of:
               4.4517517 = boost
               4.572972 = idf(docFreq=1246, maxDocs=44421)
               0.018651586 = queryNorm
             0.35726342 = fieldWeight in 2108, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.572972 = idf(docFreq=1246, maxDocs=44421)
               0.078125 = fieldNorm(doc=2108)
       0.24 = coord(6/25)
   

5. Huang, M.-H.; Lin, C.-S.; Chen, D.-Z.: Counting methods, country rank changes, and counting inflation in the assessment of national research productivity and impact (2011) 0.24

   0.23913123 = sum of:
     0.23913123 = product of:
       0.99638015 = sum of:
         0.032435022 = weight(abstract_txt:number in 942) [ClassicSimilarity], result of:
           0.032435022 = score(doc=942,freq=2.0), product of:
             0.088730484 = queryWeight, product of:
               1.150299 = boost
               4.1356745 = idf(docFreq=1930, maxDocs=44421)
               0.018651586 = queryNorm
             0.36554542 = fieldWeight in 942, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               4.1356745 = idf(docFreq=1930, maxDocs=44421)
               0.0625 = fieldNorm(doc=942)
         0.0349419 = weight(abstract_txt:paper in 942) [ClassicSimilarity], result of:
           0.0349419 = score(doc=942,freq=3.0), product of:
             0.09324547 = queryWeight, product of:
               1.4442215 = boost
               3.4616103 = idf(docFreq=3788, maxDocs=44421)
               0.018651586 = queryNorm
             0.3747303 = fieldWeight in 942, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               3.4616103 = idf(docFreq=3788, maxDocs=44421)
               0.0625 = fieldNorm(doc=942)
         0.47338867 = weight(abstract_txt:counting in 942) [ClassicSimilarity], result of:
           0.47338867 = score(doc=942,freq=11.0), product of:
             0.30020717 = queryWeight, product of:
               2.1158497 = boost
               7.607123 = idf(docFreq=59, maxDocs=44421)
               0.018651586 = queryNorm
             1.5768733 = fieldWeight in 942, product of:
               3.3166249 = tf(freq=11.0), with freq of:
                 11.0 = termFreq=11.0
               7.607123 = idf(docFreq=59, maxDocs=44421)
               0.0625 = fieldNorm(doc=942)
         0.10423917 = weight(abstract_txt:citations in 942) [ClassicSimilarity], result of:
           0.10423917 = score(doc=942,freq=2.0), product of:
             0.22119795 = queryWeight, product of:
               2.2243876 = boost
               5.331567 = idf(docFreq=583, maxDocs=44421)
               0.018651586 = queryNorm
             0.47124836 = fieldWeight in 942, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               5.331567 = idf(docFreq=583, maxDocs=44421)
               0.0625 = fieldNorm(doc=942)
         0.19790001 = weight(abstract_txt:fractional in 942) [ClassicSimilarity], result of:
           0.19790001 = score(doc=942,freq=1.0), product of:
             0.37328216 = queryWeight, product of:
               2.359353 = boost
               8.482592 = idf(docFreq=24, maxDocs=44421)
               0.018651586 = queryNorm
             0.530162 = fieldWeight in 942, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               8.482592 = idf(docFreq=24, maxDocs=44421)
               0.0625 = fieldNorm(doc=942)
         0.15347539 = weight(abstract_txt:impact in 942) [ClassicSimilarity], result of:
           0.15347539 = score(doc=942,freq=2.0), product of:
             0.37970403 = queryWeight, product of:
               4.4517517 = boost
               4.572972 = idf(docFreq=1246, maxDocs=44421)
               0.018651586 = queryNorm
             0.40419742 = fieldWeight in 942, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               4.572972 = idf(docFreq=1246, maxDocs=44421)
               0.0625 = fieldNorm(doc=942)
       0.24 = coord(6/25)