Document (#36539)

Author
Lewandowski, D.
Title
¬The retrieval effectiveness of search engines on navigational queries
Source
Aslib proceedings. 63(2011) no.4, S.354-363
Year
2011
Abstract
Purpose - The purpose of this paper is to test major web search engines on their performance on navigational queries, i.e. searches for homepages. Design/methodology/approach - In total, 100 user queries are posed to six search engines (Google, Yahoo!, MSN, Ask, Seekport, and Exalead). Users described the desired pages, and the results position of these was recorded. Measured success and mean reciprocal rank are calculated. Findings - The performance of the major search engines Google, Yahoo!, and MSN was found to be the best, with around 90 per cent of queries answered correctly. Ask and Exalead performed worse but received good scores as well. Research limitations/implications - All queries were in German, and the German-language interfaces of the search engines were used. Therefore, the results are only valid for German queries. Practical implications - When designing a search engine to compete with the major search engines, care should be taken on the performance on navigational queries. Users can be influenced easily in their quality ratings of search engines based on this performance. Originality/value - This study systematically compares the major search engines on navigational queries and compares the findings with studies on the retrieval effectiveness of the engines on informational queries.
Theme
Suchmaschinen

Similar documents (author)

  1. Lewandowski, D.: Informationsarmut : sowohl ein quantitatives als auch ein qualitatives Problem (1999) 4.81
    4.8134003 = sum of:
      4.8134003 = weight(author_txt:lewandowski in 4647) [ClassicSimilarity], result of:
        4.8134003 = fieldWeight in 4647, product of:
          1.0 = tf(freq=1.0), with freq of:
            1.0 = termFreq=1.0
          7.7014403 = idf(docFreq=51, maxDocs=42306)
          0.625 = fieldNorm(doc=4647)
    
  2. Lewandowski, D.: Wie können sich Bibliotheken gegenüber Wissenschaftssuchmaschinen positionieren? (2007) 4.81
    4.8134003 = sum of:
      4.8134003 = weight(author_txt:lewandowski in 113) [ClassicSimilarity], result of:
        4.8134003 = fieldWeight in 113, product of:
          1.0 = tf(freq=1.0), with freq of:
            1.0 = termFreq=1.0
          7.7014403 = idf(docFreq=51, maxDocs=42306)
          0.625 = fieldNorm(doc=113)
    
  3. Lewandowski, D.: "Find what I mean not what I say" : Neuere Ansätze zur Qualifizierung von Suchmaschinen-Ergebnissen (2001) 4.81
    4.8134003 = sum of:
      4.8134003 = weight(author_txt:lewandowski in 933) [ClassicSimilarity], result of:
        4.8134003 = fieldWeight in 933, product of:
          1.0 = tf(freq=1.0), with freq of:
            1.0 = termFreq=1.0
          7.7014403 = idf(docFreq=51, maxDocs=42306)
          0.625 = fieldNorm(doc=933)
    
  4. Lewandowski, D.: Alles nur noch Google? : Entwicklungen im Bereich der WWW-Suchmaschinen (2002) 4.81
    4.8134003 = sum of:
      4.8134003 = weight(author_txt:lewandowski in 1998) [ClassicSimilarity], result of:
        4.8134003 = fieldWeight in 1998, product of:
          1.0 = tf(freq=1.0), with freq of:
            1.0 = termFreq=1.0
          7.7014403 = idf(docFreq=51, maxDocs=42306)
          0.625 = fieldNorm(doc=1998)
    
  5. Lewandowski, D.: Aktualität als erfolgskritischer Faktor bei Suchmaschinen (2006) 4.81
    4.8134003 = sum of:
      4.8134003 = weight(author_txt:lewandowski in 2817) [ClassicSimilarity], result of:
        4.8134003 = fieldWeight in 2817, product of:
          1.0 = tf(freq=1.0), with freq of:
            1.0 = termFreq=1.0
          7.7014403 = idf(docFreq=51, maxDocs=42306)
          0.625 = fieldNorm(doc=2817)
    

Similar documents (content)

  1. Lewandowski, D.: Evaluating the retrieval effectiveness of web search engines using a representative query sample (2015) 0.77
    0.77477247 = sum of:
      0.77477247 = product of:
        1.6141093 = sum of:
          0.011619929 = weight(abstract_txt:this in 4158) [ClassicSimilarity], result of:
            0.011619929 = score(doc=4158,freq=3.0), product of:
              0.034986828 = queryWeight, product of:
                2.4544165 = idf(docFreq=9879, maxDocs=42306)
                0.014254642 = queryNorm
              0.33212298 = fieldWeight in 4158, product of:
                1.7320508 = tf(freq=3.0), with freq of:
                  3.0 = termFreq=3.0
                2.4544165 = idf(docFreq=9879, maxDocs=42306)
                0.078125 = fieldNorm(doc=4158)
          0.021700565 = weight(abstract_txt:were in 4158) [ClassicSimilarity], result of:
            0.021700565 = score(doc=4158,freq=2.0), product of:
              0.053057842 = queryWeight, product of:
                1.0054879 = boost
                3.7018294 = idf(docFreq=2837, maxDocs=42306)
                0.014254642 = queryNorm
              0.40899825 = fieldWeight in 4158, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                3.7018294 = idf(docFreq=2837, maxDocs=42306)
                0.078125 = fieldNorm(doc=4158)
          0.007318215 = weight(abstract_txt:with in 4158) [ClassicSimilarity], result of:
            0.007318215 = score(doc=4158,freq=1.0), product of:
              0.037074853 = queryWeight, product of:
                1.0294077 = boost
                2.5265954 = idf(docFreq=9191, maxDocs=42306)
                0.014254642 = queryNorm
              0.19739026 = fieldWeight in 4158, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                2.5265954 = idf(docFreq=9191, maxDocs=42306)
                0.078125 = fieldNorm(doc=4158)
          0.04060745 = weight(abstract_txt:effectiveness in 4158) [ClassicSimilarity], result of:
            0.04060745 = score(doc=4158,freq=1.0), product of:
              0.10151169 = queryWeight, product of:
                1.3907853 = boost
                5.12035 = idf(docFreq=686, maxDocs=42306)
                0.014254642 = queryNorm
              0.40002733 = fieldWeight in 4158, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.12035 = idf(docFreq=686, maxDocs=42306)
                0.078125 = fieldNorm(doc=4158)
          0.06767939 = weight(abstract_txt:google in 4158) [ClassicSimilarity], result of:
            0.06767939 = score(doc=4158,freq=2.0), product of:
              0.11325913 = queryWeight, product of:
                1.4690572 = boost
                5.4085174 = idf(docFreq=514, maxDocs=42306)
                0.014254642 = queryNorm
              0.5975624 = fieldWeight in 4158, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                5.4085174 = idf(docFreq=514, maxDocs=42306)
                0.078125 = fieldNorm(doc=4158)
          0.105267644 = weight(abstract_txt:performance in 4158) [ClassicSimilarity], result of:
            0.105267644 = score(doc=4158,freq=3.0), product of:
              0.16734461 = queryWeight, product of:
                2.525358 = boost
                4.6487103 = idf(docFreq=1100, maxDocs=42306)
                0.014254642 = queryNorm
              0.6290471 = fieldWeight in 4158, product of:
                1.7320508 = tf(freq=3.0), with freq of:
                  3.0 = termFreq=3.0
                4.6487103 = idf(docFreq=1100, maxDocs=42306)
                0.078125 = fieldNorm(doc=4158)
          0.061644822 = weight(abstract_txt:major in 4158) [ClassicSimilarity], result of:
            0.061644822 = score(doc=4158,freq=1.0), product of:
              0.16893514 = queryWeight, product of:
                2.5373306 = boost
                4.6707497 = idf(docFreq=1076, maxDocs=42306)
                0.014254642 = queryNorm
              0.36490232 = fieldWeight in 4158, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                4.6707497 = idf(docFreq=1076, maxDocs=42306)
                0.078125 = fieldNorm(doc=4158)
          0.11223767 = weight(abstract_txt:german in 4158) [ClassicSimilarity], result of:
            0.11223767 = score(doc=4158,freq=1.0), product of:
              0.22885923 = queryWeight, product of:
                2.557596 = boost
                6.2774057 = idf(docFreq=215, maxDocs=42306)
                0.014254642 = queryNorm
              0.4904223 = fieldWeight in 4158, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                6.2774057 = idf(docFreq=215, maxDocs=42306)
                0.078125 = fieldNorm(doc=4158)
          0.40911907 = weight(abstract_txt:navigational in 4158) [ClassicSimilarity], result of:
            0.40911907 = score(doc=4158,freq=3.0), product of:
              0.41366455 = queryWeight, product of:
                3.9704638 = boost
                7.308879 = idf(docFreq=76, maxDocs=42306)
                0.014254642 = queryNorm
              0.98901165 = fieldWeight in 4158, product of:
                1.7320508 = tf(freq=3.0), with freq of:
                  3.0 = termFreq=3.0
                7.308879 = idf(docFreq=76, maxDocs=42306)
                0.078125 = fieldNorm(doc=4158)
          0.13300218 = weight(abstract_txt:search in 4158) [ClassicSimilarity], result of:
            0.13300218 = score(doc=4158,freq=4.0), product of:
              0.23284608 = queryWeight, product of:
                4.468305 = boost
                3.6556938 = idf(docFreq=2971, maxDocs=42306)
                0.014254642 = queryNorm
              0.57120216 = fieldWeight in 4158, product of:
                2.0 = tf(freq=4.0), with freq of:
                  4.0 = termFreq=4.0
                3.6556938 = idf(docFreq=2971, maxDocs=42306)
                0.078125 = fieldNorm(doc=4158)
          0.44085538 = weight(abstract_txt:queries in 4158) [ClassicSimilarity], result of:
            0.44085538 = score(doc=4158,freq=6.0), product of:
              0.4521995 = queryWeight, product of:
                6.226921 = boost
                5.094486 = idf(docFreq=704, maxDocs=42306)
                0.014254642 = queryNorm
              0.9749135 = fieldWeight in 4158, product of:
                2.4494898 = tf(freq=6.0), with freq of:
                  6.0 = termFreq=6.0
                5.094486 = idf(docFreq=704, maxDocs=42306)
                0.078125 = fieldNorm(doc=4158)
          0.20305704 = weight(abstract_txt:engines in 4158) [ClassicSimilarity], result of:
            0.20305704 = score(doc=4158,freq=1.0), product of:
              0.4900741 = queryWeight, product of:
                6.4824505 = boost
                5.303545 = idf(docFreq=571, maxDocs=42306)
                0.014254642 = queryNorm
              0.41433945 = fieldWeight in 4158, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.303545 = idf(docFreq=571, maxDocs=42306)
                0.078125 = fieldNorm(doc=4158)
        0.48 = coord(12/25)
    
  2. Spink, A.; Jansen, B.J.; Blakely, C.; Koshman, S.: ¬A study of results overlap and uniqueness among major Web search engines (2006) 0.65
    0.6545658 = sum of:
      0.6545658 = product of:
        1.3636788 = sum of:
          0.006641343 = weight(abstract_txt:this in 2994) [ClassicSimilarity], result of:
            0.006641343 = score(doc=2994,freq=2.0), product of:
              0.034986828 = queryWeight, product of:
                2.4544165 = idf(docFreq=9879, maxDocs=42306)
                0.014254642 = queryNorm
              0.18982409 = fieldWeight in 2994, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                2.4544165 = idf(docFreq=9879, maxDocs=42306)
                0.0546875 = fieldNorm(doc=2994)
          0.0151903955 = weight(abstract_txt:were in 2994) [ClassicSimilarity], result of:
            0.0151903955 = score(doc=2994,freq=2.0), product of:
              0.053057842 = queryWeight, product of:
                1.0054879 = boost
                3.7018294 = idf(docFreq=2837, maxDocs=42306)
                0.014254642 = queryNorm
              0.28629878 = fieldWeight in 2994, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                3.7018294 = idf(docFreq=2837, maxDocs=42306)
                0.0546875 = fieldNorm(doc=2994)
          0.00512275 = weight(abstract_txt:with in 2994) [ClassicSimilarity], result of:
            0.00512275 = score(doc=2994,freq=1.0), product of:
              0.037074853 = queryWeight, product of:
                1.0294077 = boost
                2.5265954 = idf(docFreq=9191, maxDocs=42306)
                0.014254642 = queryNorm
              0.13817318 = fieldWeight in 2994, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                2.5265954 = idf(docFreq=9191, maxDocs=42306)
                0.0546875 = fieldNorm(doc=2994)
          0.016384067 = weight(abstract_txt:findings in 2994) [ClassicSimilarity], result of:
            0.016384067 = score(doc=2994,freq=1.0), product of:
              0.07030637 = queryWeight, product of:
                1.1574425 = boost
                4.261269 = idf(docFreq=1621, maxDocs=42306)
                0.014254642 = queryNorm
              0.23303816 = fieldWeight in 2994, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                4.261269 = idf(docFreq=1621, maxDocs=42306)
                0.0546875 = fieldNorm(doc=2994)
          0.033499595 = weight(abstract_txt:google in 2994) [ClassicSimilarity], result of:
            0.033499595 = score(doc=2994,freq=1.0), product of:
              0.11325913 = queryWeight, product of:
                1.4690572 = boost
                5.4085174 = idf(docFreq=514, maxDocs=42306)
                0.014254642 = queryNorm
              0.2957783 = fieldWeight in 2994, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.4085174 = idf(docFreq=514, maxDocs=42306)
                0.0546875 = fieldNorm(doc=2994)
          0.0422073 = weight(abstract_txt:compares in 2994) [ClassicSimilarity], result of:
            0.0422073 = score(doc=2994,freq=1.0), product of:
              0.13212103 = queryWeight, product of:
                1.5866753 = boost
                5.841543 = idf(docFreq=333, maxDocs=42306)
                0.014254642 = queryNorm
              0.31945938 = fieldWeight in 2994, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.841543 = idf(docFreq=333, maxDocs=42306)
                0.0546875 = fieldNorm(doc=2994)
          0.06095296 = weight(abstract_txt:yahoo in 2994) [ClassicSimilarity], result of:
            0.06095296 = score(doc=2994,freq=1.0), product of:
              0.16880168 = queryWeight, product of:
                1.7934549 = boost
                6.602828 = idf(docFreq=155, maxDocs=42306)
                0.014254642 = queryNorm
              0.36109215 = fieldWeight in 2994, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                6.602828 = idf(docFreq=155, maxDocs=42306)
                0.0546875 = fieldNorm(doc=2994)
          0.042543408 = weight(abstract_txt:performance in 2994) [ClassicSimilarity], result of:
            0.042543408 = score(doc=2994,freq=1.0), product of:
              0.16734461 = queryWeight, product of:
                2.525358 = boost
                4.6487103 = idf(docFreq=1100, maxDocs=42306)
                0.014254642 = queryNorm
              0.25422633 = fieldWeight in 2994, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                4.6487103 = idf(docFreq=1100, maxDocs=42306)
                0.0546875 = fieldNorm(doc=2994)
          0.06102526 = weight(abstract_txt:major in 2994) [ClassicSimilarity], result of:
            0.06102526 = score(doc=2994,freq=2.0), product of:
              0.16893514 = queryWeight, product of:
                2.5373306 = boost
                4.6707497 = idf(docFreq=1076, maxDocs=42306)
                0.014254642 = queryNorm
              0.36123484 = fieldWeight in 2994, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                4.6707497 = idf(docFreq=1076, maxDocs=42306)
                0.0546875 = fieldNorm(doc=2994)
          0.1919337 = weight(abstract_txt:search in 2994) [ClassicSimilarity], result of:
            0.1919337 = score(doc=2994,freq=17.0), product of:
              0.23284608 = queryWeight, product of:
                4.468305 = boost
                3.6556938 = idf(docFreq=2971, maxDocs=42306)
                0.014254642 = queryNorm
              0.8242943 = fieldWeight in 2994, product of:
                4.1231055 = tf(freq=17.0), with freq of:
                  17.0 = termFreq=17.0
                3.6556938 = idf(docFreq=2971, maxDocs=42306)
                0.0546875 = fieldNorm(doc=2994)
          0.35633913 = weight(abstract_txt:queries in 2994) [ClassicSimilarity], result of:
            0.35633913 = score(doc=2994,freq=8.0), product of:
              0.4521995 = queryWeight, product of:
                6.226921 = boost
                5.094486 = idf(docFreq=704, maxDocs=42306)
                0.014254642 = queryNorm
              0.7880131 = fieldWeight in 2994, product of:
                2.828427 = tf(freq=8.0), with freq of:
                  8.0 = termFreq=8.0
                5.094486 = idf(docFreq=704, maxDocs=42306)
                0.0546875 = fieldNorm(doc=2994)
          0.5318389 = weight(abstract_txt:engines in 2994) [ClassicSimilarity], result of:
            0.5318389 = score(doc=2994,freq=14.0), product of:
              0.4900741 = queryWeight, product of:
                6.4824505 = boost
                5.303545 = idf(docFreq=571, maxDocs=42306)
                0.014254642 = queryNorm
              1.0852214 = fieldWeight in 2994, product of:
                3.7416575 = tf(freq=14.0), with freq of:
                  14.0 = termFreq=14.0
                5.303545 = idf(docFreq=571, maxDocs=42306)
                0.0546875 = fieldNorm(doc=2994)
        0.48 = coord(12/25)
    
  3. Lewandowski, D.: ¬The retrieval effectiveness of web search engines : considering results descriptions (2008) 0.46
    0.45550388 = sum of:
      0.45550388 = product of:
        1.0352361 = sum of:
          0.0120010115 = weight(abstract_txt:this in 165) [ClassicSimilarity], result of:
            0.0120010115 = score(doc=165,freq=5.0), product of:
              0.034986828 = queryWeight, product of:
                2.4544165 = idf(docFreq=9879, maxDocs=42306)
                0.014254642 = queryNorm
              0.34301513 = fieldWeight in 165, product of:
                2.236068 = tf(freq=5.0), with freq of:
                  5.0 = termFreq=5.0
                2.4544165 = idf(docFreq=9879, maxDocs=42306)
                0.0625 = fieldNorm(doc=165)
          0.018724646 = weight(abstract_txt:findings in 165) [ClassicSimilarity], result of:
            0.018724646 = score(doc=165,freq=1.0), product of:
              0.07030637 = queryWeight, product of:
                1.1574425 = boost
                4.261269 = idf(docFreq=1621, maxDocs=42306)
                0.014254642 = queryNorm
              0.26632932 = fieldWeight in 165, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                4.261269 = idf(docFreq=1621, maxDocs=42306)
                0.0625 = fieldNorm(doc=165)
          0.031911578 = weight(abstract_txt:purpose in 165) [ClassicSimilarity], result of:
            0.031911578 = score(doc=165,freq=2.0), product of:
              0.07961736 = queryWeight, product of:
                1.2317029 = boost
                4.534668 = idf(docFreq=1233, maxDocs=42306)
                0.014254642 = queryNorm
              0.4008118 = fieldWeight in 165, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                4.534668 = idf(docFreq=1233, maxDocs=42306)
                0.0625 = fieldNorm(doc=165)
          0.03213568 = weight(abstract_txt:implications in 165) [ClassicSimilarity], result of:
            0.03213568 = score(doc=165,freq=2.0), product of:
              0.07998967 = queryWeight, product of:
                1.2345794 = boost
                4.5452585 = idf(docFreq=1220, maxDocs=42306)
                0.014254642 = queryNorm
              0.40174788 = fieldWeight in 165, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                4.5452585 = idf(docFreq=1220, maxDocs=42306)
                0.0625 = fieldNorm(doc=165)
          0.03248596 = weight(abstract_txt:effectiveness in 165) [ClassicSimilarity], result of:
            0.03248596 = score(doc=165,freq=1.0), product of:
              0.10151169 = queryWeight, product of:
                1.3907853 = boost
                5.12035 = idf(docFreq=686, maxDocs=42306)
                0.014254642 = queryNorm
              0.32002187 = fieldWeight in 165, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.12035 = idf(docFreq=686, maxDocs=42306)
                0.0625 = fieldNorm(doc=165)
          0.076570496 = weight(abstract_txt:google in 165) [ClassicSimilarity], result of:
            0.076570496 = score(doc=165,freq=4.0), product of:
              0.11325913 = queryWeight, product of:
                1.4690572 = boost
                5.4085174 = idf(docFreq=514, maxDocs=42306)
                0.014254642 = queryNorm
              0.67606467 = fieldWeight in 165, product of:
                2.0 = tf(freq=4.0), with freq of:
                  4.0 = termFreq=4.0
                5.4085174 = idf(docFreq=514, maxDocs=42306)
                0.0625 = fieldNorm(doc=165)
          0.09851486 = weight(abstract_txt:yahoo in 165) [ClassicSimilarity], result of:
            0.09851486 = score(doc=165,freq=2.0), product of:
              0.16880168 = queryWeight, product of:
                1.7934549 = boost
                6.602828 = idf(docFreq=155, maxDocs=42306)
                0.014254642 = queryNorm
              0.58361304 = fieldWeight in 165, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                6.602828 = idf(docFreq=155, maxDocs=42306)
                0.0625 = fieldNorm(doc=165)
          0.08541757 = weight(abstract_txt:major in 165) [ClassicSimilarity], result of:
            0.08541757 = score(doc=165,freq=3.0), product of:
              0.16893514 = queryWeight, product of:
                2.5373306 = boost
                4.6707497 = idf(docFreq=1076, maxDocs=42306)
                0.014254642 = queryNorm
              0.50562346 = fieldWeight in 165, product of:
                1.7320508 = tf(freq=3.0), with freq of:
                  3.0 = termFreq=3.0
                4.6707497 = idf(docFreq=1076, maxDocs=42306)
                0.0625 = fieldNorm(doc=165)
          0.118960775 = weight(abstract_txt:search in 165) [ClassicSimilarity], result of:
            0.118960775 = score(doc=165,freq=5.0), product of:
              0.23284608 = queryWeight, product of:
                4.468305 = boost
                3.6556938 = idf(docFreq=2971, maxDocs=42306)
                0.014254642 = queryNorm
              0.51089877 = fieldWeight in 165, product of:
                2.236068 = tf(freq=5.0), with freq of:
                  5.0 = termFreq=5.0
                3.6556938 = idf(docFreq=2971, maxDocs=42306)
                0.0625 = fieldNorm(doc=165)
          0.20362236 = weight(abstract_txt:queries in 165) [ClassicSimilarity], result of:
            0.20362236 = score(doc=165,freq=2.0), product of:
              0.4521995 = queryWeight, product of:
                6.226921 = boost
                5.094486 = idf(docFreq=704, maxDocs=42306)
                0.014254642 = queryNorm
              0.4502932 = fieldWeight in 165, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                5.094486 = idf(docFreq=704, maxDocs=42306)
                0.0625 = fieldNorm(doc=165)
          0.32489124 = weight(abstract_txt:engines in 165) [ClassicSimilarity], result of:
            0.32489124 = score(doc=165,freq=4.0), product of:
              0.4900741 = queryWeight, product of:
                6.4824505 = boost
                5.303545 = idf(docFreq=571, maxDocs=42306)
                0.014254642 = queryNorm
              0.6629431 = fieldWeight in 165, product of:
                2.0 = tf(freq=4.0), with freq of:
                  4.0 = termFreq=4.0
                5.303545 = idf(docFreq=571, maxDocs=42306)
                0.0625 = fieldNorm(doc=165)
        0.44 = coord(11/25)
    
  4. Bilal, D.: Ranking, relevance judgment, and precision of information retrieval on children's queries : evaluation of Google, Yahoo!, Bing, Yahoo! Kids, and ask Kids (2012) 0.44
    0.43928644 = sum of:
      0.43928644 = product of:
        1.098216 = sum of:
          0.0046961387 = weight(abstract_txt:this in 2394) [ClassicSimilarity], result of:
            0.0046961387 = score(doc=2394,freq=1.0), product of:
              0.034986828 = queryWeight, product of:
                2.4544165 = idf(docFreq=9879, maxDocs=42306)
                0.014254642 = queryNorm
              0.1342259 = fieldWeight in 2394, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                2.4544165 = idf(docFreq=9879, maxDocs=42306)
                0.0546875 = fieldNorm(doc=2394)
          0.010741231 = weight(abstract_txt:were in 2394) [ClassicSimilarity], result of:
            0.010741231 = score(doc=2394,freq=1.0), product of:
              0.053057842 = queryWeight, product of:
                1.0054879 = boost
                3.7018294 = idf(docFreq=2837, maxDocs=42306)
                0.014254642 = queryNorm
              0.2024438 = fieldWeight in 2394, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                3.7018294 = idf(docFreq=2837, maxDocs=42306)
                0.0546875 = fieldNorm(doc=2394)
          0.008872864 = weight(abstract_txt:with in 2394) [ClassicSimilarity], result of:
            0.008872864 = score(doc=2394,freq=3.0), product of:
              0.037074853 = queryWeight, product of:
                1.0294077 = boost
                2.5265954 = idf(docFreq=9191, maxDocs=42306)
                0.014254642 = queryNorm
              0.23932298 = fieldWeight in 2394, product of:
                1.7320508 = tf(freq=3.0), with freq of:
                  3.0 = termFreq=3.0
                2.5265954 = idf(docFreq=9191, maxDocs=42306)
                0.0546875 = fieldNorm(doc=2394)
          0.016384067 = weight(abstract_txt:findings in 2394) [ClassicSimilarity], result of:
            0.016384067 = score(doc=2394,freq=1.0), product of:
              0.07030637 = queryWeight, product of:
                1.1574425 = boost
                4.261269 = idf(docFreq=1621, maxDocs=42306)
                0.014254642 = queryNorm
              0.23303816 = fieldWeight in 2394, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                4.261269 = idf(docFreq=1621, maxDocs=42306)
                0.0546875 = fieldNorm(doc=2394)
          0.01988294 = weight(abstract_txt:implications in 2394) [ClassicSimilarity], result of:
            0.01988294 = score(doc=2394,freq=1.0), product of:
              0.07998967 = queryWeight, product of:
                1.2345794 = boost
                4.5452585 = idf(docFreq=1220, maxDocs=42306)
                0.014254642 = queryNorm
              0.24856883 = fieldWeight in 2394, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                4.5452585 = idf(docFreq=1220, maxDocs=42306)
                0.0546875 = fieldNorm(doc=2394)
          0.06699919 = weight(abstract_txt:google in 2394) [ClassicSimilarity], result of:
            0.06699919 = score(doc=2394,freq=4.0), product of:
              0.11325913 = queryWeight, product of:
                1.4690572 = boost
                5.4085174 = idf(docFreq=514, maxDocs=42306)
                0.014254642 = queryNorm
              0.5915566 = fieldWeight in 2394, product of:
                2.0 = tf(freq=4.0), with freq of:
                  4.0 = termFreq=4.0
                5.4085174 = idf(docFreq=514, maxDocs=42306)
                0.0546875 = fieldNorm(doc=2394)
          0.17240101 = weight(abstract_txt:yahoo in 2394) [ClassicSimilarity], result of:
            0.17240101 = score(doc=2394,freq=8.0), product of:
              0.16880168 = queryWeight, product of:
                1.7934549 = boost
                6.602828 = idf(docFreq=155, maxDocs=42306)
                0.014254642 = queryNorm
              1.0213228 = fieldWeight in 2394, product of:
                2.828427 = tf(freq=8.0), with freq of:
                  8.0 = termFreq=8.0
                6.602828 = idf(docFreq=155, maxDocs=42306)
                0.0546875 = fieldNorm(doc=2394)
          0.06583272 = weight(abstract_txt:search in 2394) [ClassicSimilarity], result of:
            0.06583272 = score(doc=2394,freq=2.0), product of:
              0.23284608 = queryWeight, product of:
                4.468305 = boost
                3.6556938 = idf(docFreq=2971, maxDocs=42306)
                0.014254642 = queryNorm
              0.28273064 = fieldWeight in 2394, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                3.6556938 = idf(docFreq=2971, maxDocs=42306)
                0.0546875 = fieldNorm(doc=2394)
          0.35633913 = weight(abstract_txt:queries in 2394) [ClassicSimilarity], result of:
            0.35633913 = score(doc=2394,freq=8.0), product of:
              0.4521995 = queryWeight, product of:
                6.226921 = boost
                5.094486 = idf(docFreq=704, maxDocs=42306)
                0.014254642 = queryNorm
              0.7880131 = fieldWeight in 2394, product of:
                2.828427 = tf(freq=8.0), with freq of:
                  8.0 = termFreq=8.0
                5.094486 = idf(docFreq=704, maxDocs=42306)
                0.0546875 = fieldNorm(doc=2394)
          0.37606686 = weight(abstract_txt:engines in 2394) [ClassicSimilarity], result of:
            0.37606686 = score(doc=2394,freq=7.0), product of:
              0.4900741 = queryWeight, product of:
                6.4824505 = boost
                5.303545 = idf(docFreq=571, maxDocs=42306)
                0.014254642 = queryNorm
              0.76736736 = fieldWeight in 2394, product of:
                2.6457512 = tf(freq=7.0), with freq of:
                  7.0 = termFreq=7.0
                5.303545 = idf(docFreq=571, maxDocs=42306)
                0.0546875 = fieldNorm(doc=2394)
        0.4 = coord(10/25)
    
  5. Bar-Ilan, J.; Levene, M.; Mat-Hassan, M.: Methods for evaluating dynamic changes in search engine rankings : a case study (2006) 0.40
    0.4047569 = sum of:
      0.4047569 = product of:
        0.9199021 = sum of:
          0.006641343 = weight(abstract_txt:this in 1742) [ClassicSimilarity], result of:
            0.006641343 = score(doc=1742,freq=2.0), product of:
              0.034986828 = queryWeight, product of:
                2.4544165 = idf(docFreq=9879, maxDocs=42306)
                0.014254642 = queryNorm
              0.18982409 = fieldWeight in 1742, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                2.4544165 = idf(docFreq=9879, maxDocs=42306)
                0.0546875 = fieldNorm(doc=1742)
          0.018604357 = weight(abstract_txt:were in 1742) [ClassicSimilarity], result of:
            0.018604357 = score(doc=1742,freq=3.0), product of:
              0.053057842 = queryWeight, product of:
                1.0054879 = boost
                3.7018294 = idf(docFreq=2837, maxDocs=42306)
                0.014254642 = queryNorm
              0.35064292 = fieldWeight in 1742, product of:
                1.7320508 = tf(freq=3.0), with freq of:
                  3.0 = termFreq=3.0
                3.7018294 = idf(docFreq=2837, maxDocs=42306)
                0.0546875 = fieldNorm(doc=1742)
          0.0072446633 = weight(abstract_txt:with in 1742) [ClassicSimilarity], result of:
            0.0072446633 = score(doc=1742,freq=2.0), product of:
              0.037074853 = queryWeight, product of:
                1.0294077 = boost
                2.5265954 = idf(docFreq=9191, maxDocs=42306)
                0.014254642 = queryNorm
              0.19540639 = fieldWeight in 1742, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                2.5265954 = idf(docFreq=9191, maxDocs=42306)
                0.0546875 = fieldNorm(doc=1742)
          0.023170568 = weight(abstract_txt:findings in 1742) [ClassicSimilarity], result of:
            0.023170568 = score(doc=1742,freq=2.0), product of:
              0.07030637 = queryWeight, product of:
                1.1574425 = boost
                4.261269 = idf(docFreq=1621, maxDocs=42306)
                0.014254642 = queryNorm
              0.3295657 = fieldWeight in 1742, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                4.261269 = idf(docFreq=1621, maxDocs=42306)
                0.0546875 = fieldNorm(doc=1742)
          0.01974428 = weight(abstract_txt:purpose in 1742) [ClassicSimilarity], result of:
            0.01974428 = score(doc=1742,freq=1.0), product of:
              0.07961736 = queryWeight, product of:
                1.2317029 = boost
                4.534668 = idf(docFreq=1233, maxDocs=42306)
                0.014254642 = queryNorm
              0.24798965 = fieldWeight in 1742, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                4.534668 = idf(docFreq=1233, maxDocs=42306)
                0.0546875 = fieldNorm(doc=1742)
          0.047375575 = weight(abstract_txt:google in 1742) [ClassicSimilarity], result of:
            0.047375575 = score(doc=1742,freq=2.0), product of:
              0.11325913 = queryWeight, product of:
                1.4690572 = boost
                5.4085174 = idf(docFreq=514, maxDocs=42306)
                0.014254642 = queryNorm
              0.41829365 = fieldWeight in 1742, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                5.4085174 = idf(docFreq=514, maxDocs=42306)
                0.0546875 = fieldNorm(doc=1742)
          0.0422073 = weight(abstract_txt:compares in 1742) [ClassicSimilarity], result of:
            0.0422073 = score(doc=1742,freq=1.0), product of:
              0.13212103 = queryWeight, product of:
                1.5866753 = boost
                5.841543 = idf(docFreq=333, maxDocs=42306)
                0.014254642 = queryNorm
              0.31945938 = fieldWeight in 1742, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.841543 = idf(docFreq=333, maxDocs=42306)
                0.0546875 = fieldNorm(doc=1742)
          0.06102526 = weight(abstract_txt:major in 1742) [ClassicSimilarity], result of:
            0.06102526 = score(doc=1742,freq=2.0), product of:
              0.16893514 = queryWeight, product of:
                2.5373306 = boost
                4.6707497 = idf(docFreq=1076, maxDocs=42306)
                0.014254642 = queryNorm
              0.36123484 = fieldWeight in 1742, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                4.6707497 = idf(docFreq=1076, maxDocs=42306)
                0.0546875 = fieldNorm(doc=1742)
          0.1396523 = weight(abstract_txt:search in 1742) [ClassicSimilarity], result of:
            0.1396523 = score(doc=1742,freq=9.0), product of:
              0.23284608 = queryWeight, product of:
                4.468305 = boost
                3.6556938 = idf(docFreq=2971, maxDocs=42306)
                0.014254642 = queryNorm
              0.59976226 = fieldWeight in 1742, product of:
                3.0 = tf(freq=9.0), with freq of:
                  9.0 = termFreq=9.0
                3.6556938 = idf(docFreq=2971, maxDocs=42306)
                0.0546875 = fieldNorm(doc=1742)
          0.17816956 = weight(abstract_txt:queries in 1742) [ClassicSimilarity], result of:
            0.17816956 = score(doc=1742,freq=2.0), product of:
              0.4521995 = queryWeight, product of:
                6.226921 = boost
                5.094486 = idf(docFreq=704, maxDocs=42306)
                0.014254642 = queryNorm
              0.39400655 = fieldWeight in 1742, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                5.094486 = idf(docFreq=704, maxDocs=42306)
                0.0546875 = fieldNorm(doc=1742)
          0.37606686 = weight(abstract_txt:engines in 1742) [ClassicSimilarity], result of:
            0.37606686 = score(doc=1742,freq=7.0), product of:
              0.4900741 = queryWeight, product of:
                6.4824505 = boost
                5.303545 = idf(docFreq=571, maxDocs=42306)
                0.014254642 = queryNorm
              0.76736736 = fieldWeight in 1742, product of:
                2.6457512 = tf(freq=7.0), with freq of:
                  7.0 = termFreq=7.0
                5.303545 = idf(docFreq=571, maxDocs=42306)
                0.0546875 = fieldNorm(doc=1742)
        0.44 = coord(11/25)