Document (#29397)

Author
Kettunen, K.
Kunttu, T.
Järvelin, K.
Title
To stem or lemmatize a highly inflectional language in a probabilistic IR environment?
Source
Journal of documentation. 61(2005) no.4, S.476-496
Year
2005
Abstract
Purpose - To show that stem generation compares well with lemmatization as a morphological tool for a highly inflectional language for IR purposes in a best-match retrieval system. Design/methodology/approach - Effects of three different morphological methods - lemmatization, stemming and stem production - for Finnish are compared in a probabilistic IR environment (INQUERY). Evaluation is done using a four-point relevance scale which is partitioned differently in different test settings. Findings - Results show that stem production, a lighter method than morphological lemmatization, compares well with lemmatization in a best-match IR environment. Differences in performance between stem production and lemmatization are small and they are not statistically significant in most of the tested settings. It is also shown that hitherto a rather neglected method of morphological processing for Finnish, stemming, performs reasonably well although the stemmer used - a Porter stemmer implementation - is far from optimal for a morphologically complex language like Finnish. In another series of tests, the effects of compound splitting and derivational expansion of queries are tested. Practical implications - Usefulness of morphological lemmatization and stem generation for IR purposes can be estimated with many factors. On the average P-R level they seem to behave very close to each other in a probabilistic IR system. Thus, the choice of the used method with highly inflectional languages needs to be estimated along other dimensions too. Originality/value - Results are achieved using Finnish as an example of a highly inflectional language. The results are of interest for anyone who is interested in processing of morphological variation of a highly inflected language for IR purposes.
Footnote
Vgl. auch unter: http://www.emeraldinsight.com/10.1108/00220410510607480
Theme
Computerlinguistik

Similar documents (author)

  1. Järvelin, K.: ¬An analysis of two approaches in information retrieval : from frameworks to study designs (2007) 5.00
    5.0043335 = sum of:
      5.0043335 = weight(author_txt:järvelin in 2327) [ClassicSimilarity], result of:
        5.0043335 = fieldWeight in 2327, product of:
          1.0 = tf(freq=1.0), with freq of:
            1.0 = termFreq=1.0
          8.006933 = idf(docFreq=37, maxDocs=41962)
          0.625 = fieldNorm(doc=2327)
    
  2. Järvelin, K.: Evaluation (2011) 5.00
    5.0043335 = sum of:
      5.0043335 = weight(author_txt:järvelin in 2549) [ClassicSimilarity], result of:
        5.0043335 = fieldWeight in 2549, product of:
          1.0 = tf(freq=1.0), with freq of:
            1.0 = termFreq=1.0
          8.006933 = idf(docFreq=37, maxDocs=41962)
          0.625 = fieldNorm(doc=2549)
    
  3. Järvelin, K.; Vakkari, P.: ¬The evolution of library and information science 1965-1985 : a content analysis of journal titles (1993) 4.00
    4.0034666 = sum of:
      4.0034666 = weight(author_txt:järvelin in 4649) [ClassicSimilarity], result of:
        4.0034666 = fieldWeight in 4649, product of:
          1.0 = tf(freq=1.0), with freq of:
            1.0 = termFreq=1.0
          8.006933 = idf(docFreq=37, maxDocs=41962)
          0.5 = fieldNorm(doc=4649)
    
  4. Kristensen, J.; Järvelin, K.: ¬The effectiveness of a searching thesaurus in free-text searching in a full-text database (1990) 4.00
    4.0034666 = sum of:
      4.0034666 = weight(author_txt:järvelin in 2112) [ClassicSimilarity], result of:
        4.0034666 = fieldWeight in 2112, product of:
          1.0 = tf(freq=1.0), with freq of:
            1.0 = termFreq=1.0
          8.006933 = idf(docFreq=37, maxDocs=41962)
          0.5 = fieldNorm(doc=2112)
    
  5. Pirkola, A.; Järvelin, K.: Employing the resolution power of search keys (2001) 4.00
    4.0034666 = sum of:
      4.0034666 = weight(author_txt:järvelin in 403) [ClassicSimilarity], result of:
        4.0034666 = fieldWeight in 403, product of:
          1.0 = tf(freq=1.0), with freq of:
            1.0 = termFreq=1.0
          8.006933 = idf(docFreq=37, maxDocs=41962)
          0.5 = fieldNorm(doc=403)
    

Similar documents (content)

  1. Fautsch, C.; Savoy, J.: Algorithmic stemmers or morphological analysis? : an evaluation (2009) 0.32
    0.32316995 = sum of:
      0.32316995 = product of:
        1.3465415 = sum of:
          0.08508162 = weight(abstract_txt:morphologically in 116) [ClassicSimilarity], result of:
            0.08508162 = score(doc=116,freq=1.0), product of:
              0.11657594 = queryWeight, product of:
                9.341934 = idf(docFreq=9, maxDocs=41962)
                0.01247878 = queryNorm
              0.7298386 = fieldWeight in 116, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                9.341934 = idf(docFreq=9, maxDocs=41962)
                0.078125 = fieldNorm(doc=116)
          0.12155109 = weight(abstract_txt:stemming in 116) [ClassicSimilarity], result of:
            0.12155109 = score(doc=116,freq=2.0), product of:
              0.14787371 = queryWeight, product of:
                1.5927808 = boost
                7.439827 = idf(docFreq=66, maxDocs=41962)
                0.01247878 = queryNorm
              0.8219925 = fieldWeight in 116, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                7.439827 = idf(docFreq=66, maxDocs=41962)
                0.078125 = fieldNorm(doc=116)
          0.16039346 = weight(abstract_txt:stemmer in 116) [ClassicSimilarity], result of:
            0.16039346 = score(doc=116,freq=1.0), product of:
              0.22414008 = queryWeight, product of:
                1.9609671 = boost
                9.159613 = idf(docFreq=11, maxDocs=41962)
                0.01247878 = queryNorm
              0.71559477 = fieldWeight in 116, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                9.159613 = idf(docFreq=11, maxDocs=41962)
                0.078125 = fieldNorm(doc=116)
          0.054727454 = weight(abstract_txt:language in 116) [ClassicSimilarity], result of:
            0.054727454 = score(doc=116,freq=2.0), product of:
              0.11789677 = queryWeight, product of:
                2.2487 = boost
                4.2014413 = idf(docFreq=1707, maxDocs=41962)
                0.01247878 = queryNorm
              0.46419805 = fieldWeight in 116, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                4.2014413 = idf(docFreq=1707, maxDocs=41962)
                0.078125 = fieldNorm(doc=116)
          0.5740494 = weight(abstract_txt:morphological in 116) [ClassicSimilarity], result of:
            0.5740494 = score(doc=116,freq=3.0), product of:
              0.52443856 = queryWeight, product of:
                5.1953936 = boost
                8.089171 = idf(docFreq=34, maxDocs=41962)
                0.01247878 = queryNorm
              1.094598 = fieldWeight in 116, product of:
                1.7320508 = tf(freq=3.0), with freq of:
                  3.0 = termFreq=3.0
                8.089171 = idf(docFreq=34, maxDocs=41962)
                0.078125 = fieldNorm(doc=116)
          0.35073853 = weight(abstract_txt:stem in 116) [ClassicSimilarity], result of:
            0.35073853 = score(doc=116,freq=1.0), product of:
              0.54461694 = queryWeight, product of:
                5.2943997 = boost
                8.243322 = idf(docFreq=29, maxDocs=41962)
                0.01247878 = queryNorm
              0.6440096 = fieldWeight in 116, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                8.243322 = idf(docFreq=29, maxDocs=41962)
                0.078125 = fieldNorm(doc=116)
        0.24 = coord(6/25)
    
  2. Kraaij, W.; Pohlmann, R.: Evaluation of a Dutch stemming algorithm (1995) 0.27
    0.27349794 = sum of:
      0.27349794 = product of:
        0.9767784 = sum of:
          0.08508162 = weight(abstract_txt:morphologically in 5867) [ClassicSimilarity], result of:
            0.08508162 = score(doc=5867,freq=1.0), product of:
              0.11657594 = queryWeight, product of:
                9.341934 = idf(docFreq=9, maxDocs=41962)
                0.01247878 = queryNorm
              0.7298386 = fieldWeight in 5867, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                9.341934 = idf(docFreq=9, maxDocs=41962)
                0.078125 = fieldNorm(doc=5867)
          0.03775563 = weight(abstract_txt:effects in 5867) [ClassicSimilarity], result of:
            0.03775563 = score(doc=5867,freq=1.0), product of:
              0.08545082 = queryWeight, product of:
                1.2107896 = boost
                5.655558 = idf(docFreq=398, maxDocs=41962)
                0.01247878 = queryNorm
              0.44184047 = fieldWeight in 5867, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.655558 = idf(docFreq=398, maxDocs=41962)
                0.078125 = fieldNorm(doc=5867)
          0.041577123 = weight(abstract_txt:method in 5867) [ClassicSimilarity], result of:
            0.041577123 = score(doc=5867,freq=2.0), product of:
              0.08279138 = queryWeight, product of:
                1.4596499 = boost
                4.545318 = idf(docFreq=1210, maxDocs=41962)
                0.01247878 = queryNorm
              0.5021914 = fieldWeight in 5867, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                4.545318 = idf(docFreq=1210, maxDocs=41962)
                0.078125 = fieldNorm(doc=5867)
          0.14886905 = weight(abstract_txt:stemming in 5867) [ClassicSimilarity], result of:
            0.14886905 = score(doc=5867,freq=3.0), product of:
              0.14787371 = queryWeight, product of:
                1.5927808 = boost
                7.439827 = idf(docFreq=66, maxDocs=41962)
                0.01247878 = queryNorm
              1.006731 = fieldWeight in 5867, product of:
                1.7320508 = tf(freq=3.0), with freq of:
                  3.0 = termFreq=3.0
                7.439827 = idf(docFreq=66, maxDocs=41962)
                0.078125 = fieldNorm(doc=5867)
          0.2268306 = weight(abstract_txt:stemmer in 5867) [ClassicSimilarity], result of:
            0.2268306 = score(doc=5867,freq=2.0), product of:
              0.22414008 = queryWeight, product of:
                1.9609671 = boost
                9.159613 = idf(docFreq=11, maxDocs=41962)
                0.01247878 = queryNorm
              1.0120038 = fieldWeight in 5867, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                9.159613 = idf(docFreq=11, maxDocs=41962)
                0.078125 = fieldNorm(doc=5867)
          0.08592579 = weight(abstract_txt:highly in 5867) [ClassicSimilarity], result of:
            0.08592579 = score(doc=5867,freq=1.0), product of:
              0.20065846 = queryWeight, product of:
                2.9336565 = boost
                5.481205 = idf(docFreq=474, maxDocs=41962)
                0.01247878 = queryNorm
              0.42821914 = fieldWeight in 5867, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.481205 = idf(docFreq=474, maxDocs=41962)
                0.078125 = fieldNorm(doc=5867)
          0.35073853 = weight(abstract_txt:stem in 5867) [ClassicSimilarity], result of:
            0.35073853 = score(doc=5867,freq=1.0), product of:
              0.54461694 = queryWeight, product of:
                5.2943997 = boost
                8.243322 = idf(docFreq=29, maxDocs=41962)
                0.01247878 = queryNorm
              0.6440096 = fieldWeight in 5867, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                8.243322 = idf(docFreq=29, maxDocs=41962)
                0.078125 = fieldNorm(doc=5867)
        0.28 = coord(7/25)
    
  3. Snajder, J.; Dalbelo Basic, B.D.; Tadic, M.: Automatic acquisition of inflectional lexica for morphological normalisation (2008) 0.27
    0.27292952 = sum of:
      0.27292952 = product of:
        1.1372063 = sum of:
          0.08508162 = weight(abstract_txt:morphologically in 4911) [ClassicSimilarity], result of:
            0.08508162 = score(doc=4911,freq=1.0), product of:
              0.11657594 = queryWeight, product of:
                9.341934 = idf(docFreq=9, maxDocs=41962)
                0.01247878 = queryNorm
              0.7298386 = fieldWeight in 4911, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                9.341934 = idf(docFreq=9, maxDocs=41962)
                0.078125 = fieldNorm(doc=4911)
          0.013693325 = weight(abstract_txt:results in 4911) [ClassicSimilarity], result of:
            0.013693325 = score(doc=4911,freq=1.0), product of:
              0.04974676 = queryWeight, product of:
                1.1314583 = boost
                3.5233364 = idf(docFreq=3364, maxDocs=41962)
                0.01247878 = queryNorm
              0.27526066 = fieldWeight in 4911, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                3.5233364 = idf(docFreq=3364, maxDocs=41962)
                0.078125 = fieldNorm(doc=4911)
          0.0859496 = weight(abstract_txt:stemming in 4911) [ClassicSimilarity], result of:
            0.0859496 = score(doc=4911,freq=1.0), product of:
              0.14787371 = queryWeight, product of:
                1.5927808 = boost
                7.439827 = idf(docFreq=66, maxDocs=41962)
                0.01247878 = queryNorm
              0.5812365 = fieldWeight in 4911, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                7.439827 = idf(docFreq=66, maxDocs=41962)
                0.078125 = fieldNorm(doc=4911)
          0.054727454 = weight(abstract_txt:language in 4911) [ClassicSimilarity], result of:
            0.054727454 = score(doc=4911,freq=2.0), product of:
              0.11789677 = queryWeight, product of:
                2.2487 = boost
                4.2014413 = idf(docFreq=1707, maxDocs=41962)
                0.01247878 = queryNorm
              0.46419805 = fieldWeight in 4911, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                4.2014413 = idf(docFreq=1707, maxDocs=41962)
                0.078125 = fieldNorm(doc=4911)
          0.08592579 = weight(abstract_txt:highly in 4911) [ClassicSimilarity], result of:
            0.08592579 = score(doc=4911,freq=1.0), product of:
              0.20065846 = queryWeight, product of:
                2.9336565 = boost
                5.481205 = idf(docFreq=474, maxDocs=41962)
                0.01247878 = queryNorm
              0.42821914 = fieldWeight in 4911, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.481205 = idf(docFreq=474, maxDocs=41962)
                0.078125 = fieldNorm(doc=4911)
          0.81182855 = weight(abstract_txt:morphological in 4911) [ClassicSimilarity], result of:
            0.81182855 = score(doc=4911,freq=6.0), product of:
              0.52443856 = queryWeight, product of:
                5.1953936 = boost
                8.089171 = idf(docFreq=34, maxDocs=41962)
                0.01247878 = queryNorm
              1.5479956 = fieldWeight in 4911, product of:
                2.4494898 = tf(freq=6.0), with freq of:
                  6.0 = termFreq=6.0
                8.089171 = idf(docFreq=34, maxDocs=41962)
                0.078125 = fieldNorm(doc=4911)
        0.24 = coord(6/25)
    
  4. Airio, E.; Kettunen, K.: Does dictionary based bilingual retrieval work in a non-normalized index? (2009) 0.23
    0.22762798 = sum of:
      0.22762798 = product of:
        0.6322999 = sum of:
          0.01095466 = weight(abstract_txt:results in 1225) [ClassicSimilarity], result of:
            0.01095466 = score(doc=1225,freq=1.0), product of:
              0.04974676 = queryWeight, product of:
                1.1314583 = boost
                3.5233364 = idf(docFreq=3364, maxDocs=41962)
                0.01247878 = queryNorm
              0.22020853 = fieldWeight in 1225, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                3.5233364 = idf(docFreq=3364, maxDocs=41962)
                0.0625 = fieldNorm(doc=1225)
          0.03040701 = weight(abstract_txt:generation in 1225) [ClassicSimilarity], result of:
            0.03040701 = score(doc=1225,freq=1.0), product of:
              0.08583233 = queryWeight, product of:
                1.2134894 = boost
                5.668169 = idf(docFreq=393, maxDocs=41962)
                0.01247878 = queryNorm
              0.35426056 = fieldWeight in 1225, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.668169 = idf(docFreq=393, maxDocs=41962)
                0.0625 = fieldNorm(doc=1225)
          0.033664916 = weight(abstract_txt:tested in 1225) [ClassicSimilarity], result of:
            0.033664916 = score(doc=1225,freq=1.0), product of:
              0.09185866 = queryWeight, product of:
                1.2553667 = boost
                5.863776 = idf(docFreq=323, maxDocs=41962)
                0.01247878 = queryNorm
              0.366486 = fieldWeight in 1225, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.863776 = idf(docFreq=323, maxDocs=41962)
                0.0625 = fieldNorm(doc=1225)
          0.015447928 = weight(abstract_txt:well in 1225) [ClassicSimilarity], result of:
            0.015447928 = score(doc=1225,freq=1.0), product of:
              0.062557444 = queryWeight, product of:
                1.2688073 = boost
                3.9510381 = idf(docFreq=2193, maxDocs=41962)
                0.01247878 = queryNorm
              0.24693988 = fieldWeight in 1225, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                3.9510381 = idf(docFreq=2193, maxDocs=41962)
                0.0625 = fieldNorm(doc=1225)
          0.023519572 = weight(abstract_txt:method in 1225) [ClassicSimilarity], result of:
            0.023519572 = score(doc=1225,freq=1.0), product of:
              0.08279138 = queryWeight, product of:
                1.4596499 = boost
                4.545318 = idf(docFreq=1210, maxDocs=41962)
                0.01247878 = queryNorm
              0.28408238 = fieldWeight in 1225, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                4.545318 = idf(docFreq=1210, maxDocs=41962)
                0.0625 = fieldNorm(doc=1225)
          0.06875968 = weight(abstract_txt:stemming in 1225) [ClassicSimilarity], result of:
            0.06875968 = score(doc=1225,freq=1.0), product of:
              0.14787371 = queryWeight, product of:
                1.5927808 = boost
                7.439827 = idf(docFreq=66, maxDocs=41962)
                0.01247878 = queryNorm
              0.4649892 = fieldWeight in 1225, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                7.439827 = idf(docFreq=66, maxDocs=41962)
                0.0625 = fieldNorm(doc=1225)
          0.061917048 = weight(abstract_txt:language in 1225) [ClassicSimilarity], result of:
            0.061917048 = score(doc=1225,freq=4.0), product of:
              0.11789677 = queryWeight, product of:
                2.2487 = boost
                4.2014413 = idf(docFreq=1707, maxDocs=41962)
                0.01247878 = queryNorm
              0.52518016 = fieldWeight in 1225, product of:
                2.0 = tf(freq=4.0), with freq of:
                  4.0 = termFreq=4.0
                4.2014413 = idf(docFreq=1707, maxDocs=41962)
                0.0625 = fieldNorm(doc=1225)
          0.068740636 = weight(abstract_txt:highly in 1225) [ClassicSimilarity], result of:
            0.068740636 = score(doc=1225,freq=1.0), product of:
              0.20065846 = queryWeight, product of:
                2.9336565 = boost
                5.481205 = idf(docFreq=474, maxDocs=41962)
                0.01247878 = queryNorm
              0.3425753 = fieldWeight in 1225, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.481205 = idf(docFreq=474, maxDocs=41962)
                0.0625 = fieldNorm(doc=1225)
          0.3188884 = weight(abstract_txt:finnish in 1225) [ClassicSimilarity], result of:
            0.3188884 = score(doc=1225,freq=4.0), product of:
              0.32640058 = queryWeight, product of:
                3.3465781 = boost
                7.8158784 = idf(docFreq=45, maxDocs=41962)
                0.01247878 = queryNorm
              0.9769848 = fieldWeight in 1225, product of:
                2.0 = tf(freq=4.0), with freq of:
                  4.0 = termFreq=4.0
                7.8158784 = idf(docFreq=45, maxDocs=41962)
                0.0625 = fieldNorm(doc=1225)
        0.36 = coord(9/25)
    
  5. Pirkola, A.: Morphological typology of languages for IR (2001) 0.22
    0.22244099 = sum of:
      0.22244099 = product of:
        0.92683744 = sum of:
          0.025332952 = weight(abstract_txt:processing in 477) [ClassicSimilarity], result of:
            0.025332952 = score(doc=477,freq=1.0), product of:
              0.0654916 = queryWeight, product of:
                1.0599939 = boost
                4.951196 = idf(docFreq=806, maxDocs=41962)
                0.01247878 = queryNorm
              0.3868122 = fieldWeight in 477, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                4.951196 = idf(docFreq=806, maxDocs=41962)
                0.078125 = fieldNorm(doc=477)
          0.03775563 = weight(abstract_txt:effects in 477) [ClassicSimilarity], result of:
            0.03775563 = score(doc=477,freq=1.0), product of:
              0.08545082 = queryWeight, product of:
                1.2107896 = boost
                5.655558 = idf(docFreq=398, maxDocs=41962)
                0.01247878 = queryNorm
              0.44184047 = fieldWeight in 477, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.655558 = idf(docFreq=398, maxDocs=41962)
                0.078125 = fieldNorm(doc=477)
          0.0859496 = weight(abstract_txt:stemming in 477) [ClassicSimilarity], result of:
            0.0859496 = score(doc=477,freq=1.0), product of:
              0.14787371 = queryWeight, product of:
                1.5927808 = boost
                7.439827 = idf(docFreq=66, maxDocs=41962)
                0.01247878 = queryNorm
              0.5812365 = fieldWeight in 477, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                7.439827 = idf(docFreq=66, maxDocs=41962)
                0.078125 = fieldNorm(doc=477)
          0.060216602 = weight(abstract_txt:purposes in 477) [ClassicSimilarity], result of:
            0.060216602 = score(doc=477,freq=1.0), product of:
              0.13352717 = queryWeight, product of:
                1.8537066 = boost
                5.772402 = idf(docFreq=354, maxDocs=41962)
                0.01247878 = queryNorm
              0.4509689 = fieldWeight in 477, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.772402 = idf(docFreq=354, maxDocs=41962)
                0.078125 = fieldNorm(doc=477)
          0.054727454 = weight(abstract_txt:language in 477) [ClassicSimilarity], result of:
            0.054727454 = score(doc=477,freq=2.0), product of:
              0.11789677 = queryWeight, product of:
                2.2487 = boost
                4.2014413 = idf(docFreq=1707, maxDocs=41962)
                0.01247878 = queryNorm
              0.46419805 = fieldWeight in 477, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                4.2014413 = idf(docFreq=1707, maxDocs=41962)
                0.078125 = fieldNorm(doc=477)
          0.6628552 = weight(abstract_txt:morphological in 477) [ClassicSimilarity], result of:
            0.6628552 = score(doc=477,freq=4.0), product of:
              0.52443856 = queryWeight, product of:
                5.1953936 = boost
                8.089171 = idf(docFreq=34, maxDocs=41962)
                0.01247878 = queryNorm
              1.2639331 = fieldWeight in 477, product of:
                2.0 = tf(freq=4.0), with freq of:
                  4.0 = termFreq=4.0
                8.089171 = idf(docFreq=34, maxDocs=41962)
                0.078125 = fieldNorm(doc=477)
        0.24 = coord(6/25)