Document (#29419)

Author
Sihvonen, A.
Vakkari, P.
Title
Subject knowledge improves interactive query expansion assisted by a thesaurus
Source
Journal of documentation. 60(2004) no.6, S.673-690
Year
2004
Abstract
This study explores how experts and novices in pedagogics expanded queries supported by the ERIC thesaurus, and how this was connected to the search effectiveness in an easy and a difficult search task. The expert group consisted of 15 undergraduates in pedagogy and the novice group of 15 students with no previous studies in this field. Their search logs were recorded and a pre- and post-search interview was conducted. The results show that the number and type of terms selected from the thesaurus for expansion by experts improved search effectiveness, whereas there were no connections between the use of thesaurus and improvement of effectiveness among novices. The effectiveness of expansions varied between the facets of the queries. Thus, a vital condition for benefiting from a thesaurus in query expansion to improve search results is sufficient familiarity with the search topic. The results suggest also that it is not in the first place the number of terms used in expansion, but their type and quality that are crucial for search success.
Footnote
Vgl. auch unter: http://www.emeraldinsight.com/10.1108/00220410410568151
Theme
Konzeption und Anwendung des Prinzips Thesaurus
Semantisches Umfeld in Indexierung u. Retrieval

Similar documents (author)

  1. Vakkari, P.: Information seeking in context : a challenging metatheory (1997) 5.24
    5.2368803 = sum of:
      5.2368803 = weight(author_txt:vakkari in 2303) [ClassicSimilarity], result of:
        5.2368803 = fieldWeight in 2303, product of:
          1.0 = tf(freq=1.0), with freq of:
            1.0 = termFreq=1.0
          8.379008 = idf(docFreq=26, maxDocs=43254)
          0.625 = fieldNorm(doc=2303)
    
  2. Vakkari, P.: Task complexity, information types, search strategies and relevance : integrating studies on information retrieval and seeking (1999) 5.24
    5.2368803 = sum of:
      5.2368803 = weight(author_txt:vakkari in 2300) [ClassicSimilarity], result of:
        5.2368803 = fieldWeight in 2300, product of:
          1.0 = tf(freq=1.0), with freq of:
            1.0 = termFreq=1.0
          8.379008 = idf(docFreq=26, maxDocs=43254)
          0.625 = fieldNorm(doc=2300)
    
  3. Vakkari, P.: Task-based information searching (2002) 5.24
    5.2368803 = sum of:
      5.2368803 = weight(author_txt:vakkari in 289) [ClassicSimilarity], result of:
        5.2368803 = fieldWeight in 289, product of:
          1.0 = tf(freq=1.0), with freq of:
            1.0 = termFreq=1.0
          8.379008 = idf(docFreq=26, maxDocs=43254)
          0.625 = fieldNorm(doc=289)
    
  4. Vakkari, P.: ¬A theory of the task-based information retrieval process : a summary and generalisation of a longitudinal study (2001) 5.24
    5.2368803 = sum of:
      5.2368803 = weight(author_txt:vakkari in 494) [ClassicSimilarity], result of:
        5.2368803 = fieldWeight in 494, product of:
          1.0 = tf(freq=1.0), with freq of:
            1.0 = termFreq=1.0
          8.379008 = idf(docFreq=26, maxDocs=43254)
          0.625 = fieldNorm(doc=494)
    
  5. Vakkari, P.: Perceived influence of the use of electronic information resources on scholarly work and publication productivity (2008) 5.24
    5.2368803 = sum of:
      5.2368803 = weight(author_txt:vakkari in 3381) [ClassicSimilarity], result of:
        5.2368803 = fieldWeight in 3381, product of:
          1.0 = tf(freq=1.0), with freq of:
            1.0 = termFreq=1.0
          8.379008 = idf(docFreq=26, maxDocs=43254)
          0.625 = fieldNorm(doc=3381)
    

Similar documents (content)

  1. Efthimiadis, E.N.: Interactive query expansion : a user-based evaluation in a relevance feedback environment (2000) 0.35
    0.35069078 = sum of:
      0.35069078 = product of:
        0.974141 = sum of:
          0.0062744943 = weight(abstract_txt:this in 702) [ClassicSimilarity], result of:
            0.0062744943 = score(doc=702,freq=1.0), product of:
              0.04718719 = queryWeight, product of:
                1.0182002 = boost
                2.4314568 = idf(docFreq=10335, maxDocs=43254)
                0.019060066 = queryNorm
              0.13297029 = fieldWeight in 702, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                2.4314568 = idf(docFreq=10335, maxDocs=43254)
                0.0546875 = fieldNorm(doc=702)
          0.032504816 = weight(abstract_txt:were in 702) [ClassicSimilarity], result of:
            0.032504816 = score(doc=702,freq=5.0), product of:
              0.07217436 = queryWeight, product of:
                1.0281748 = boost
                3.6829145 = idf(docFreq=2956, maxDocs=43254)
                0.019060066 = queryNorm
              0.4503651 = fieldWeight in 702, product of:
                2.236068 = tf(freq=5.0), with freq of:
                  5.0 = termFreq=5.0
                3.6829145 = idf(docFreq=2956, maxDocs=43254)
                0.0546875 = fieldNorm(doc=702)
          0.067365386 = weight(abstract_txt:terms in 702) [ClassicSimilarity], result of:
            0.067365386 = score(doc=702,freq=12.0), product of:
              0.08762714 = queryWeight, product of:
                1.1329083 = boost
                4.058069 = idf(docFreq=2031, maxDocs=43254)
                0.019060066 = queryNorm
              0.768773 = fieldWeight in 702, product of:
                3.4641016 = tf(freq=12.0), with freq of:
                  12.0 = termFreq=12.0
                4.058069 = idf(docFreq=2031, maxDocs=43254)
                0.0546875 = fieldNorm(doc=702)
          0.12765431 = weight(abstract_txt:query in 702) [ClassicSimilarity], result of:
            0.12765431 = score(doc=702,freq=17.0), product of:
              0.11947633 = queryWeight, product of:
                1.3228676 = boost
                4.738502 = idf(docFreq=1028, maxDocs=43254)
                0.019060066 = queryNorm
              1.0684485 = fieldWeight in 702, product of:
                4.1231055 = tf(freq=17.0), with freq of:
                  17.0 = termFreq=17.0
                4.738502 = idf(docFreq=1028, maxDocs=43254)
                0.0546875 = fieldNorm(doc=702)
          0.036519162 = weight(abstract_txt:type in 702) [ClassicSimilarity], result of:
            0.036519162 = score(doc=702,freq=1.0), product of:
              0.13337928 = queryWeight, product of:
                1.3977183 = boost
                5.0066166 = idf(docFreq=786, maxDocs=43254)
                0.019060066 = queryNorm
              0.27379936 = fieldWeight in 702, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.0066166 = idf(docFreq=786, maxDocs=43254)
                0.0546875 = fieldNorm(doc=702)
          0.032434445 = weight(abstract_txt:results in 702) [ClassicSimilarity], result of:
            0.032434445 = score(doc=702,freq=3.0), product of:
              0.09781426 = queryWeight, product of:
                1.4659601 = boost
                3.5007057 = idf(docFreq=3547, maxDocs=43254)
                0.019060066 = queryNorm
              0.3315922 = fieldWeight in 702, product of:
                1.7320508 = tf(freq=3.0), with freq of:
                  3.0 = termFreq=3.0
                3.5007057 = idf(docFreq=3547, maxDocs=43254)
                0.0546875 = fieldNorm(doc=702)
          0.10970576 = weight(abstract_txt:effectiveness in 702) [ClassicSimilarity], result of:
            0.10970576 = score(doc=702,freq=2.0), product of:
              0.27769035 = queryWeight, product of:
                2.8521402 = boost
                5.1081724 = idf(docFreq=710, maxDocs=43254)
                0.019060066 = queryNorm
              0.39506507 = fieldWeight in 702, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                5.1081724 = idf(docFreq=710, maxDocs=43254)
                0.0546875 = fieldNorm(doc=702)
          0.4814432 = weight(abstract_txt:expansion in 702) [ClassicSimilarity], result of:
            0.4814432 = score(doc=702,freq=13.0), product of:
              0.3988413 = queryWeight, product of:
                3.4181452 = boost
                6.1218853 = idf(docFreq=257, maxDocs=43254)
                0.019060066 = queryNorm
              1.2071047 = fieldWeight in 702, product of:
                3.6055512 = tf(freq=13.0), with freq of:
                  13.0 = termFreq=13.0
                6.1218853 = idf(docFreq=257, maxDocs=43254)
                0.0546875 = fieldNorm(doc=702)
          0.080239385 = weight(abstract_txt:search in 702) [ClassicSimilarity], result of:
            0.080239385 = score(doc=702,freq=2.0), product of:
              0.28401607 = queryWeight, product of:
                4.079218 = boost
                3.6529322 = idf(docFreq=3046, maxDocs=43254)
                0.019060066 = queryNorm
              0.28251705 = fieldWeight in 702, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                3.6529322 = idf(docFreq=3046, maxDocs=43254)
                0.0546875 = fieldNorm(doc=702)
        0.36 = coord(9/25)
    
  2. Aula, A.; Nordhausen, K.: Modeling successful performance in Web searching (2006) 0.35
    0.34969774 = sum of:
      0.34969774 = product of:
        0.7947676 = sum of:
          0.061138358 = weight(abstract_txt:novice in 1118) [ClassicSimilarity], result of:
            0.061138358 = score(doc=1118,freq=1.0), product of:
              0.13654603 = queryWeight, product of:
                7.1639853 = idf(docFreq=90, maxDocs=43254)
                0.019060066 = queryNorm
              0.44774908 = fieldWeight in 1118, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                7.1639853 = idf(docFreq=90, maxDocs=43254)
                0.0625 = fieldNorm(doc=1118)
          0.007170851 = weight(abstract_txt:this in 1118) [ClassicSimilarity], result of:
            0.007170851 = score(doc=1118,freq=1.0), product of:
              0.04718719 = queryWeight, product of:
                1.0182002 = boost
                2.4314568 = idf(docFreq=10335, maxDocs=43254)
                0.019060066 = queryNorm
              0.15196605 = fieldWeight in 1118, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                2.4314568 = idf(docFreq=10335, maxDocs=43254)
                0.0625 = fieldNorm(doc=1118)
          0.023494683 = weight(abstract_txt:were in 1118) [ClassicSimilarity], result of:
            0.023494683 = score(doc=1118,freq=2.0), product of:
              0.07217436 = queryWeight, product of:
                1.0281748 = boost
                3.6829145 = idf(docFreq=2956, maxDocs=43254)
                0.019060066 = queryNorm
              0.3255267 = fieldWeight in 1118, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                3.6829145 = idf(docFreq=2956, maxDocs=43254)
                0.0625 = fieldNorm(doc=1118)
          0.022224814 = weight(abstract_txt:terms in 1118) [ClassicSimilarity], result of:
            0.022224814 = score(doc=1118,freq=1.0), product of:
              0.08762714 = queryWeight, product of:
                1.1329083 = boost
                4.058069 = idf(docFreq=2031, maxDocs=43254)
                0.019060066 = queryNorm
              0.25362933 = fieldWeight in 1118, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                4.058069 = idf(docFreq=2031, maxDocs=43254)
                0.0625 = fieldNorm(doc=1118)
          0.023355672 = weight(abstract_txt:number in 1118) [ClassicSimilarity], result of:
            0.023355672 = score(doc=1118,freq=1.0), product of:
              0.09057496 = queryWeight, product of:
                1.1518065 = boost
                4.1257625 = idf(docFreq=1898, maxDocs=43254)
                0.019060066 = queryNorm
              0.25786015 = fieldWeight in 1118, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                4.1257625 = idf(docFreq=1898, maxDocs=43254)
                0.0625 = fieldNorm(doc=1118)
          0.061286326 = weight(abstract_txt:query in 1118) [ClassicSimilarity], result of:
            0.061286326 = score(doc=1118,freq=3.0), product of:
              0.11947633 = queryWeight, product of:
                1.3228676 = boost
                4.738502 = idf(docFreq=1028, maxDocs=43254)
                0.019060066 = queryNorm
              0.5129579 = fieldWeight in 1118, product of:
                1.7320508 = tf(freq=3.0), with freq of:
                  3.0 = termFreq=3.0
                4.738502 = idf(docFreq=1028, maxDocs=43254)
                0.0625 = fieldNorm(doc=1118)
          0.08785867 = weight(abstract_txt:queries in 1118) [ClassicSimilarity], result of:
            0.08785867 = score(doc=1118,freq=4.0), product of:
              0.13801183 = queryWeight, product of:
                1.4217839 = boost
                5.0928197 = idf(docFreq=721, maxDocs=43254)
                0.019060066 = queryNorm
              0.63660246 = fieldWeight in 1118, product of:
                2.0 = tf(freq=4.0), with freq of:
                  4.0 = termFreq=4.0
                5.0928197 = idf(docFreq=721, maxDocs=43254)
                0.0625 = fieldNorm(doc=1118)
          0.030265845 = weight(abstract_txt:results in 1118) [ClassicSimilarity], result of:
            0.030265845 = score(doc=1118,freq=2.0), product of:
              0.09781426 = queryWeight, product of:
                1.4659601 = boost
                3.5007057 = idf(docFreq=3547, maxDocs=43254)
                0.019060066 = queryNorm
              0.3094216 = fieldWeight in 1118, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                3.5007057 = idf(docFreq=3547, maxDocs=43254)
                0.0625 = fieldNorm(doc=1118)
          0.100803405 = weight(abstract_txt:experts in 1118) [ClassicSimilarity], result of:
            0.100803405 = score(doc=1118,freq=2.0), product of:
              0.19056949 = queryWeight, product of:
                1.6707141 = boost
                5.9844856 = idf(docFreq=295, maxDocs=43254)
                0.019060066 = queryNorm
              0.5289588 = fieldWeight in 1118, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                5.9844856 = idf(docFreq=295, maxDocs=43254)
                0.0625 = fieldNorm(doc=1118)
          0.21833622 = weight(abstract_txt:novices in 1118) [ClassicSimilarity], result of:
            0.21833622 = score(doc=1118,freq=2.0), product of:
              0.31902185 = queryWeight, product of:
                2.1616514 = boost
                7.7430196 = idf(docFreq=50, maxDocs=43254)
                0.019060066 = queryNorm
              0.6843927 = fieldWeight in 1118, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                7.7430196 = idf(docFreq=50, maxDocs=43254)
                0.0625 = fieldNorm(doc=1118)
          0.1588328 = weight(abstract_txt:search in 1118) [ClassicSimilarity], result of:
            0.1588328 = score(doc=1118,freq=6.0), product of:
              0.28401607 = queryWeight, product of:
                4.079218 = boost
                3.6529322 = idf(docFreq=3046, maxDocs=43254)
                0.019060066 = queryNorm
              0.5592388 = fieldWeight in 1118, product of:
                2.4494898 = tf(freq=6.0), with freq of:
                  6.0 = termFreq=6.0
                3.6529322 = idf(docFreq=3046, maxDocs=43254)
                0.0625 = fieldNorm(doc=1118)
        0.44 = coord(11/25)
    
  3. Hsieh-Yee, I.: Effects of search experience and subject knowledge on the search tactics of novice and experienced searchers (1993) 0.35
    0.34708866 = sum of:
      0.34708866 = product of:
        0.8677217 = sum of:
          0.08646269 = weight(abstract_txt:novice in 4406) [ClassicSimilarity], result of:
            0.08646269 = score(doc=4406,freq=2.0), product of:
              0.13654603 = queryWeight, product of:
                7.1639853 = idf(docFreq=90, maxDocs=43254)
                0.019060066 = queryNorm
              0.6332128 = fieldWeight in 4406, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                7.1639853 = idf(docFreq=90, maxDocs=43254)
                0.0625 = fieldNorm(doc=4406)
          0.007170851 = weight(abstract_txt:this in 4406) [ClassicSimilarity], result of:
            0.007170851 = score(doc=4406,freq=1.0), product of:
              0.04718719 = queryWeight, product of:
                1.0182002 = boost
                2.4314568 = idf(docFreq=10335, maxDocs=43254)
                0.019060066 = queryNorm
              0.15196605 = fieldWeight in 4406, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                2.4314568 = idf(docFreq=10335, maxDocs=43254)
                0.0625 = fieldNorm(doc=4406)
          0.03714836 = weight(abstract_txt:were in 4406) [ClassicSimilarity], result of:
            0.03714836 = score(doc=4406,freq=5.0), product of:
              0.07217436 = queryWeight, product of:
                1.0281748 = boost
                3.6829145 = idf(docFreq=2956, maxDocs=43254)
                0.019060066 = queryNorm
              0.514703 = fieldWeight in 4406, product of:
                2.236068 = tf(freq=5.0), with freq of:
                  5.0 = termFreq=5.0
                3.6829145 = idf(docFreq=2956, maxDocs=43254)
                0.0625 = fieldNorm(doc=4406)
          0.07196135 = weight(abstract_txt:eric in 4406) [ClassicSimilarity], result of:
            0.07196135 = score(doc=4406,freq=1.0), product of:
              0.15221919 = queryWeight, product of:
                1.0558329 = boost
                7.563971 = idf(docFreq=60, maxDocs=43254)
                0.019060066 = queryNorm
              0.4727482 = fieldWeight in 4406, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                7.563971 = idf(docFreq=60, maxDocs=43254)
                0.0625 = fieldNorm(doc=4406)
          0.05443945 = weight(abstract_txt:terms in 4406) [ClassicSimilarity], result of:
            0.05443945 = score(doc=4406,freq=6.0), product of:
              0.08762714 = queryWeight, product of:
                1.1329083 = boost
                4.058069 = idf(docFreq=2031, maxDocs=43254)
                0.019060066 = queryNorm
              0.62126243 = fieldWeight in 4406, product of:
                2.4494898 = tf(freq=6.0), with freq of:
                  6.0 = termFreq=6.0
                4.058069 = idf(docFreq=2031, maxDocs=43254)
                0.0625 = fieldNorm(doc=4406)
          0.03884253 = weight(abstract_txt:group in 4406) [ClassicSimilarity], result of:
            0.03884253 = score(doc=4406,freq=1.0), product of:
              0.12714079 = queryWeight, product of:
                1.3646394 = boost
                4.8881283 = idf(docFreq=885, maxDocs=43254)
                0.019060066 = queryNorm
              0.30550802 = fieldWeight in 4406, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                4.8881283 = idf(docFreq=885, maxDocs=43254)
                0.0625 = fieldNorm(doc=4406)
          0.021401184 = weight(abstract_txt:results in 4406) [ClassicSimilarity], result of:
            0.021401184 = score(doc=4406,freq=1.0), product of:
              0.09781426 = queryWeight, product of:
                1.4659601 = boost
                3.5007057 = idf(docFreq=3547, maxDocs=43254)
                0.019060066 = queryNorm
              0.2187941 = fieldWeight in 4406, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                3.5007057 = idf(docFreq=3547, maxDocs=43254)
                0.0625 = fieldNorm(doc=4406)
          0.15438703 = weight(abstract_txt:novices in 4406) [ClassicSimilarity], result of:
            0.15438703 = score(doc=4406,freq=1.0), product of:
              0.31902185 = queryWeight, product of:
                2.1616514 = boost
                7.7430196 = idf(docFreq=50, maxDocs=43254)
                0.019060066 = queryNorm
              0.48393872 = fieldWeight in 4406, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                7.7430196 = idf(docFreq=50, maxDocs=43254)
                0.0625 = fieldNorm(doc=4406)
          0.16211268 = weight(abstract_txt:thesaurus in 4406) [ClassicSimilarity], result of:
            0.16211268 = score(doc=4406,freq=2.0), product of:
              0.35502687 = queryWeight, product of:
                3.605588 = boost
                5.1660757 = idf(docFreq=670, maxDocs=43254)
                0.019060066 = queryNorm
              0.4566209 = fieldWeight in 4406, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                5.1660757 = idf(docFreq=670, maxDocs=43254)
                0.0625 = fieldNorm(doc=4406)
          0.23379554 = weight(abstract_txt:search in 4406) [ClassicSimilarity], result of:
            0.23379554 = score(doc=4406,freq=13.0), product of:
              0.28401607 = queryWeight, product of:
                4.079218 = boost
                3.6529322 = idf(docFreq=3046, maxDocs=43254)
                0.019060066 = queryNorm
              0.82317716 = fieldWeight in 4406, product of:
                3.6055512 = tf(freq=13.0), with freq of:
                  13.0 = termFreq=13.0
                3.6529322 = idf(docFreq=3046, maxDocs=43254)
                0.0625 = fieldNorm(doc=4406)
        0.4 = coord(10/25)
    
  4. Shiri, A.A.; Revie, C.: Query expansion behavior within a thesaurus-enhanced search environment : a user-centered evaluation (2006) 0.35
    0.34700128 = sum of:
      0.34700128 = product of:
        0.86750317 = sum of:
          0.010141115 = weight(abstract_txt:this in 2057) [ClassicSimilarity], result of:
            0.010141115 = score(doc=2057,freq=2.0), product of:
              0.04718719 = queryWeight, product of:
                1.0182002 = boost
                2.4314568 = idf(docFreq=10335, maxDocs=43254)
                0.019060066 = queryNorm
              0.21491244 = fieldWeight in 2057, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                2.4314568 = idf(docFreq=10335, maxDocs=43254)
                0.0625 = fieldNorm(doc=2057)
          0.0332265 = weight(abstract_txt:were in 2057) [ClassicSimilarity], result of:
            0.0332265 = score(doc=2057,freq=4.0), product of:
              0.07217436 = queryWeight, product of:
                1.0281748 = boost
                3.6829145 = idf(docFreq=2956, maxDocs=43254)
                0.019060066 = queryNorm
              0.4603643 = fieldWeight in 2057, product of:
                2.0 = tf(freq=4.0), with freq of:
                  4.0 = termFreq=4.0
                3.6829145 = idf(docFreq=2956, maxDocs=43254)
                0.0625 = fieldNorm(doc=2057)
          0.05443945 = weight(abstract_txt:terms in 2057) [ClassicSimilarity], result of:
            0.05443945 = score(doc=2057,freq=6.0), product of:
              0.08762714 = queryWeight, product of:
                1.1329083 = boost
                4.058069 = idf(docFreq=2031, maxDocs=43254)
                0.019060066 = queryNorm
              0.62126243 = fieldWeight in 2057, product of:
                2.4494898 = tf(freq=6.0), with freq of:
                  6.0 = termFreq=6.0
                4.058069 = idf(docFreq=2031, maxDocs=43254)
                0.0625 = fieldNorm(doc=2057)
          0.023355672 = weight(abstract_txt:number in 2057) [ClassicSimilarity], result of:
            0.023355672 = score(doc=2057,freq=1.0), product of:
              0.09057496 = queryWeight, product of:
                1.1518065 = boost
                4.1257625 = idf(docFreq=1898, maxDocs=43254)
                0.019060066 = queryNorm
              0.25786015 = fieldWeight in 2057, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                4.1257625 = idf(docFreq=1898, maxDocs=43254)
                0.0625 = fieldNorm(doc=2057)
          0.050040077 = weight(abstract_txt:query in 2057) [ClassicSimilarity], result of:
            0.050040077 = score(doc=2057,freq=2.0), product of:
              0.11947633 = queryWeight, product of:
                1.3228676 = boost
                4.738502 = idf(docFreq=1028, maxDocs=43254)
                0.019060066 = queryNorm
              0.41882837 = fieldWeight in 2057, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                4.738502 = idf(docFreq=1028, maxDocs=43254)
                0.0625 = fieldNorm(doc=2057)
          0.043929335 = weight(abstract_txt:queries in 2057) [ClassicSimilarity], result of:
            0.043929335 = score(doc=2057,freq=1.0), product of:
              0.13801183 = queryWeight, product of:
                1.4217839 = boost
                5.0928197 = idf(docFreq=721, maxDocs=43254)
                0.019060066 = queryNorm
              0.31830123 = fieldWeight in 2057, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.0928197 = idf(docFreq=721, maxDocs=43254)
                0.0625 = fieldNorm(doc=2057)
          0.021401184 = weight(abstract_txt:results in 2057) [ClassicSimilarity], result of:
            0.021401184 = score(doc=2057,freq=1.0), product of:
              0.09781426 = queryWeight, product of:
                1.4659601 = boost
                3.5007057 = idf(docFreq=3547, maxDocs=43254)
                0.019060066 = queryNorm
              0.2187941 = fieldWeight in 2057, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                3.5007057 = idf(docFreq=3547, maxDocs=43254)
                0.0625 = fieldNorm(doc=2057)
          0.21581434 = weight(abstract_txt:expansion in 2057) [ClassicSimilarity], result of:
            0.21581434 = score(doc=2057,freq=2.0), product of:
              0.3988413 = queryWeight, product of:
                3.4181452 = boost
                6.1218853 = idf(docFreq=257, maxDocs=43254)
                0.019060066 = queryNorm
              0.5411033 = fieldWeight in 2057, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                6.1218853 = idf(docFreq=257, maxDocs=43254)
                0.0625 = fieldNorm(doc=2057)
          0.25632268 = weight(abstract_txt:thesaurus in 2057) [ClassicSimilarity], result of:
            0.25632268 = score(doc=2057,freq=5.0), product of:
              0.35502687 = queryWeight, product of:
                3.605588 = boost
                5.1660757 = idf(docFreq=670, maxDocs=43254)
                0.019060066 = queryNorm
              0.72198105 = fieldWeight in 2057, product of:
                2.236068 = tf(freq=5.0), with freq of:
                  5.0 = termFreq=5.0
                5.1660757 = idf(docFreq=670, maxDocs=43254)
                0.0625 = fieldNorm(doc=2057)
          0.1588328 = weight(abstract_txt:search in 2057) [ClassicSimilarity], result of:
            0.1588328 = score(doc=2057,freq=6.0), product of:
              0.28401607 = queryWeight, product of:
                4.079218 = boost
                3.6529322 = idf(docFreq=3046, maxDocs=43254)
                0.019060066 = queryNorm
              0.5592388 = fieldWeight in 2057, product of:
                2.4494898 = tf(freq=6.0), with freq of:
                  6.0 = termFreq=6.0
                3.6529322 = idf(docFreq=3046, maxDocs=43254)
                0.0625 = fieldNorm(doc=2057)
        0.4 = coord(10/25)
    
  5. Srinivasan, P.: Query expansion and MEDLINE (1996) 0.34
    0.33915567 = sum of:
      0.33915567 = product of:
        1.2112702 = sum of:
          0.055003606 = weight(abstract_txt:terms in 453) [ClassicSimilarity], result of:
            0.055003606 = score(doc=453,freq=2.0), product of:
              0.08762714 = queryWeight, product of:
                1.1329083 = boost
                4.058069 = idf(docFreq=2031, maxDocs=43254)
                0.019060066 = queryNorm
              0.62770057 = fieldWeight in 453, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                4.058069 = idf(docFreq=2031, maxDocs=43254)
                0.109375 = fieldNorm(doc=453)
          0.20529956 = weight(abstract_txt:expansions in 453) [ClassicSimilarity], result of:
            0.20529956 = score(doc=453,freq=1.0), product of:
              0.21084818 = queryWeight, product of:
                1.2426401 = boost
                8.902256 = idf(docFreq=15, maxDocs=43254)
                0.019060066 = queryNorm
              0.97368425 = fieldWeight in 453, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                8.902256 = idf(docFreq=15, maxDocs=43254)
                0.109375 = fieldNorm(doc=453)
          0.10725107 = weight(abstract_txt:query in 453) [ClassicSimilarity], result of:
            0.10725107 = score(doc=453,freq=3.0), product of:
              0.11947633 = queryWeight, product of:
                1.3228676 = boost
                4.738502 = idf(docFreq=1028, maxDocs=43254)
                0.019060066 = queryNorm
              0.8976763 = fieldWeight in 453, product of:
                1.7320508 = tf(freq=3.0), with freq of:
                  3.0 = termFreq=3.0
                4.738502 = idf(docFreq=1028, maxDocs=43254)
                0.109375 = fieldNorm(doc=453)
          0.1331537 = weight(abstract_txt:queries in 453) [ClassicSimilarity], result of:
            0.1331537 = score(doc=453,freq=3.0), product of:
              0.13801183 = queryWeight, product of:
                1.4217839 = boost
                5.0928197 = idf(docFreq=721, maxDocs=43254)
                0.019060066 = queryNorm
              0.9647993 = fieldWeight in 453, product of:
                1.7320508 = tf(freq=3.0), with freq of:
                  3.0 = termFreq=3.0
                5.0928197 = idf(docFreq=721, maxDocs=43254)
                0.109375 = fieldNorm(doc=453)
          0.21941152 = weight(abstract_txt:effectiveness in 453) [ClassicSimilarity], result of:
            0.21941152 = score(doc=453,freq=2.0), product of:
              0.27769035 = queryWeight, product of:
                2.8521402 = boost
                5.1081724 = idf(docFreq=710, maxDocs=43254)
                0.019060066 = queryNorm
              0.79013014 = fieldWeight in 453, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                5.1081724 = idf(docFreq=710, maxDocs=43254)
                0.109375 = fieldNorm(doc=453)
          0.3776751 = weight(abstract_txt:expansion in 453) [ClassicSimilarity], result of:
            0.3776751 = score(doc=453,freq=2.0), product of:
              0.3988413 = queryWeight, product of:
                3.4181452 = boost
                6.1218853 = idf(docFreq=257, maxDocs=43254)
                0.019060066 = queryNorm
              0.94693077 = fieldWeight in 453, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                6.1218853 = idf(docFreq=257, maxDocs=43254)
                0.109375 = fieldNorm(doc=453)
          0.11347563 = weight(abstract_txt:search in 453) [ClassicSimilarity], result of:
            0.11347563 = score(doc=453,freq=1.0), product of:
              0.28401607 = queryWeight, product of:
                4.079218 = boost
                3.6529322 = idf(docFreq=3046, maxDocs=43254)
                0.019060066 = queryNorm
              0.39953947 = fieldWeight in 453, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                3.6529322 = idf(docFreq=3046, maxDocs=43254)
                0.109375 = fieldNorm(doc=453)
        0.28 = coord(7/25)