Document (#34351)

Author

Thelwall, M.

Title

Quantitative comparisons of search engine results

Source

Journal of the American Society for Information Science and Technology. 59(2008) no.11, S.1702-1710

Year

2008

Abstract

Search engines are normally used to find information or Web sites, but Webometric investigations use them for quantitative data such as the number of pages matching a query and the international spread of those pages. For this type of application, the accuracy of the hit count estimates and range of URLs in the full results are important. Here, we compare the applications programming interfaces of Google, Yahoo!, and Live Search for 1,587 single word searches. The hit count estimates were broadly consistent but with Yahoo! and Google, reporting 5-6 times more hits than Live Search. Yahoo! tended to return slightly more matching URLs than Google, with Live Search returning significantly fewer. Yahoo!'s result URLs included a significantly wider range of domains and sites than the other two, and there was little consistency between the three engines in the number of different domains. In contrast, the three engines were reasonably consistent in the number of different top-level domains represented in the result URLs, although Yahoo! tended to return the most. In conclusion, quantitative results from the three search engines are mostly consistent but with unexpected types of inconsistency that users should be aware of. Google is recommended for hit count estimates but Yahoo! is recommended for all other Webometric purposes.

Theme

Suchmaschinen
Informetrie

Object

Google
Yahoo

Similar documents (author)

1. Thelwall, M.; Thelwall, S.: ¬A thematic analysis of highly retweeted early COVID-19 tweets : consensus, information, dissent and lockdown life (2020) 4.89

   4.888919 = sum of:
     4.888919 = weight(author_txt:thelwall in 1179) [ClassicSimilarity], result of:
       4.888919 = fieldWeight in 1179, product of:
         1.4142135 = tf(freq=2.0), with freq of:
           2.0 = termFreq=2.0
         6.9139757 = idf(docFreq=119, maxDocs=44421)
         0.5 = fieldNorm(doc=1179)
   

2. Thelwall, M.: Extracting macroscopic information from Web links (2001) 4.32

   4.3212347 = sum of:
     4.3212347 = weight(author_txt:thelwall in 851) [ClassicSimilarity], result of:
       4.3212347 = fieldWeight in 851, product of:
         1.0 = tf(freq=1.0), with freq of:
           1.0 = termFreq=1.0
         6.9139757 = idf(docFreq=119, maxDocs=44421)
         0.625 = fieldNorm(doc=851)
   

3. Thelwall, M.: Conceptualizing documentation on the Web : an evaluation of different heuristic-based models for counting links between university Web sites (2002) 4.32

   4.3212347 = sum of:
     4.3212347 = weight(author_txt:thelwall in 1978) [ClassicSimilarity], result of:
       4.3212347 = fieldWeight in 1978, product of:
         1.0 = tf(freq=1.0), with freq of:
           1.0 = termFreq=1.0
         6.9139757 = idf(docFreq=119, maxDocs=44421)
         0.625 = fieldNorm(doc=1978)
   

4. Thelwall, M.: Text characteristics of English language university Web sites (2005) 4.32

   4.3212347 = sum of:
     4.3212347 = weight(author_txt:thelwall in 4463) [ClassicSimilarity], result of:
       4.3212347 = fieldWeight in 4463, product of:
         1.0 = tf(freq=1.0), with freq of:
           1.0 = termFreq=1.0
         6.9139757 = idf(docFreq=119, maxDocs=44421)
         0.625 = fieldNorm(doc=4463)
   

5. Thelwall, M.: Bibliometrics to webometrics (2009) 4.32

   4.3212347 = sum of:
     4.3212347 = weight(author_txt:thelwall in 5239) [ClassicSimilarity], result of:
       4.3212347 = fieldWeight in 5239, product of:
         1.0 = tf(freq=1.0), with freq of:
           1.0 = termFreq=1.0
         6.9139757 = idf(docFreq=119, maxDocs=44421)
         0.625 = fieldNorm(doc=5239)
   

Similar documents (content)

1. Thelwall, M.: Extracting accurate and complete results from search engines : case study windows live (2008) 0.52

   0.5167302 = sum of:
     0.5167302 = product of:
       1.6147819 = sum of:
         0.13080175 = weight(abstract_txt:matching in 2338) [ClassicSimilarity], result of:
           0.13080175 = score(doc=2338,freq=5.0), product of:
             0.12392497 = queryWeight, product of:
               1.194924 = boost
               6.0419855 = idf(docFreq=286, maxDocs=44421)
               0.017164804 = queryNorm
             1.0554914 = fieldWeight in 2338, product of:
               2.236068 = tf(freq=5.0), with freq of:
                 5.0 = termFreq=5.0
               6.0419855 = idf(docFreq=286, maxDocs=44421)
               0.078125 = fieldNorm(doc=2338)
         0.09998762 = weight(abstract_txt:return in 2338) [ClassicSimilarity], result of:
           0.09998762 = score(doc=2338,freq=1.0), product of:
             0.17716202 = queryWeight, product of:
               1.4287169 = boost
               7.2241306 = idf(docFreq=87, maxDocs=44421)
               0.017164804 = queryNorm
             0.5643852 = fieldWeight in 2338, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.2241306 = idf(docFreq=87, maxDocs=44421)
               0.078125 = fieldNorm(doc=2338)
         0.11102357 = weight(abstract_txt:engines in 2338) [ClassicSimilarity], result of:
           0.11102357 = score(doc=2338,freq=2.0), product of:
             0.18996923 = queryWeight, product of:
               2.092269 = boost
               5.2896495 = idf(docFreq=608, maxDocs=44421)
               0.017164804 = queryNorm
             0.5844292 = fieldWeight in 2338, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               5.2896495 = idf(docFreq=608, maxDocs=44421)
               0.078125 = fieldNorm(doc=2338)
         0.06726516 = weight(abstract_txt:search in 2338) [ClassicSimilarity], result of:
           0.06726516 = score(doc=2338,freq=3.0), product of:
             0.13601911 = queryWeight, product of:
               2.1683104 = boost
               3.654598 = idf(docFreq=3123, maxDocs=44421)
               0.017164804 = queryNorm
             0.49452728 = fieldWeight in 2338, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               3.654598 = idf(docFreq=3123, maxDocs=44421)
               0.078125 = fieldNorm(doc=2338)
         0.22175153 = weight(abstract_txt:live in 2338) [ClassicSimilarity], result of:
           0.22175153 = score(doc=2338,freq=2.0), product of:
             0.2737398 = queryWeight, product of:
               2.1750813 = boost
               7.33202 = idf(docFreq=78, maxDocs=44421)
               0.017164804 = queryNorm
             0.81008136 = fieldWeight in 2338, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               7.33202 = idf(docFreq=78, maxDocs=44421)
               0.078125 = fieldNorm(doc=2338)
         0.24141057 = weight(abstract_txt:count in 2338) [ClassicSimilarity], result of:
           0.24141057 = score(doc=2338,freq=2.0), product of:
             0.28968838 = queryWeight, product of:
               2.2375464 = boost
               7.5425844 = idf(docFreq=63, maxDocs=44421)
               0.017164804 = queryNorm
             0.8333457 = fieldWeight in 2338, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               7.5425844 = idf(docFreq=63, maxDocs=44421)
               0.078125 = fieldNorm(doc=2338)
         0.25270432 = weight(abstract_txt:estimates in 2338) [ClassicSimilarity], result of:
           0.25270432 = score(doc=2338,freq=2.0), product of:
             0.29865423 = queryWeight, product of:
               2.2719085 = boost
               7.6584163 = idf(docFreq=56, maxDocs=44421)
               0.017164804 = queryNorm
             0.8461434 = fieldWeight in 2338, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               7.6584163 = idf(docFreq=56, maxDocs=44421)
               0.078125 = fieldNorm(doc=2338)
         0.48983735 = weight(abstract_txt:urls in 2338) [ClassicSimilarity], result of:
           0.48983735 = score(doc=2338,freq=6.0), product of:
             0.35432404 = queryWeight, product of:
               2.8574338 = boost
               7.2241306 = idf(docFreq=87, maxDocs=44421)
               0.017164804 = queryNorm
             1.3824558 = fieldWeight in 2338, product of:
               2.4494898 = tf(freq=6.0), with freq of:
                 6.0 = termFreq=6.0
               7.2241306 = idf(docFreq=87, maxDocs=44421)
               0.078125 = fieldNorm(doc=2338)
       0.32 = coord(8/25)
   

2. Thelwall, M.; Sud, P.; Wilkinson, D.: Link and co-inlink network diagrams with URL citations or title mentions (2012) 0.44

   0.43968296 = sum of:
     0.43968296 = product of:
       1.0992074 = sum of:
         0.018945945 = weight(abstract_txt:results in 1057) [ClassicSimilarity], result of:
           0.018945945 = score(doc=1057,freq=2.0), product of:
             0.0616185 = queryWeight, product of:
               1.0319581 = boost
               3.4786456 = idf(docFreq=3724, maxDocs=44421)
               0.017164804 = queryNorm
             0.30747172 = fieldWeight in 1057, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               3.4786456 = idf(docFreq=3724, maxDocs=44421)
               0.0625 = fieldNorm(doc=1057)
         0.033489745 = weight(abstract_txt:sites in 1057) [ClassicSimilarity], result of:
           0.033489745 = score(doc=1057,freq=1.0), product of:
             0.099148855 = queryWeight, product of:
               1.0688204 = boost
               5.4043584 = idf(docFreq=542, maxDocs=44421)
               0.017164804 = queryNorm
             0.3377724 = fieldWeight in 1057, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.4043584 = idf(docFreq=542, maxDocs=44421)
               0.0625 = fieldNorm(doc=1057)
         0.081054874 = weight(abstract_txt:matching in 1057) [ClassicSimilarity], result of:
           0.081054874 = score(doc=1057,freq=3.0), product of:
             0.12392497 = queryWeight, product of:
               1.194924 = boost
               6.0419855 = idf(docFreq=286, maxDocs=44421)
               0.017164804 = queryNorm
             0.6540641 = fieldWeight in 1057, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               6.0419855 = idf(docFreq=286, maxDocs=44421)
               0.0625 = fieldNorm(doc=1057)
         0.022511775 = weight(abstract_txt:number in 1057) [ClassicSimilarity], result of:
           0.022511775 = score(doc=1057,freq=1.0), product of:
             0.087093025 = queryWeight, product of:
               1.226869 = boost
               4.1356745 = idf(docFreq=1930, maxDocs=44421)
               0.017164804 = queryNorm
             0.25847965 = fieldWeight in 1057, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.1356745 = idf(docFreq=1930, maxDocs=44421)
               0.0625 = fieldNorm(doc=1057)
         0.027165852 = weight(abstract_txt:three in 1057) [ClassicSimilarity], result of:
           0.027165852 = score(doc=1057,freq=1.0), product of:
             0.09871711 = queryWeight, product of:
               1.306179 = boost
               4.4030223 = idf(docFreq=1477, maxDocs=44421)
               0.017164804 = queryNorm
             0.2751889 = fieldWeight in 1057, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.4030223 = idf(docFreq=1477, maxDocs=44421)
               0.0625 = fieldNorm(doc=1057)
         0.13137725 = weight(abstract_txt:webometric in 1057) [ClassicSimilarity], result of:
           0.13137725 = score(doc=1057,freq=1.0), product of:
             0.24661903 = queryWeight, product of:
               1.6856762 = boost
               8.523414 = idf(docFreq=23, maxDocs=44421)
               0.017164804 = queryNorm
             0.53271335 = fieldWeight in 1057, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               8.523414 = idf(docFreq=23, maxDocs=44421)
               0.0625 = fieldNorm(doc=1057)
         0.13656244 = weight(abstract_txt:count in 1057) [ClassicSimilarity], result of:
           0.13656244 = score(doc=1057,freq=1.0), product of:
             0.28968838 = queryWeight, product of:
               2.2375464 = boost
               7.5425844 = idf(docFreq=63, maxDocs=44421)
               0.017164804 = queryNorm
             0.47141153 = fieldWeight in 1057, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.5425844 = idf(docFreq=63, maxDocs=44421)
               0.0625 = fieldNorm(doc=1057)
         0.14295115 = weight(abstract_txt:estimates in 1057) [ClassicSimilarity], result of:
           0.14295115 = score(doc=1057,freq=1.0), product of:
             0.29865423 = queryWeight, product of:
               2.2719085 = boost
               7.6584163 = idf(docFreq=56, maxDocs=44421)
               0.017164804 = queryNorm
             0.47865102 = fieldWeight in 1057, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.6584163 = idf(docFreq=56, maxDocs=44421)
               0.0625 = fieldNorm(doc=1057)
         0.3199604 = weight(abstract_txt:urls in 1057) [ClassicSimilarity], result of:
           0.3199604 = score(doc=1057,freq=4.0), product of:
             0.35432404 = queryWeight, product of:
               2.8574338 = boost
               7.2241306 = idf(docFreq=87, maxDocs=44421)
               0.017164804 = queryNorm
             0.9030163 = fieldWeight in 1057, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               7.2241306 = idf(docFreq=87, maxDocs=44421)
               0.0625 = fieldNorm(doc=1057)
         0.18518797 = weight(abstract_txt:yahoo in 1057) [ClassicSimilarity], result of:
           0.18518797 = score(doc=1057,freq=1.0), product of:
             0.44715908 = queryWeight, product of:
               3.931448 = boost
               6.6262937 = idf(docFreq=159, maxDocs=44421)
               0.017164804 = queryNorm
             0.41414335 = fieldWeight in 1057, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.6262937 = idf(docFreq=159, maxDocs=44421)
               0.0625 = fieldNorm(doc=1057)
       0.4 = coord(10/25)
   

3. Thelwall, M.; Sud, P.: ¬A comparison of methods for collecting web citation data for academic organizations (2011) 0.41

   0.41286808 = sum of:
     0.41286808 = product of:
       1.1468557 = sum of:
         0.013396808 = weight(abstract_txt:results in 626) [ClassicSimilarity], result of:
           0.013396808 = score(doc=626,freq=1.0), product of:
             0.0616185 = queryWeight, product of:
               1.0319581 = boost
               3.4786456 = idf(docFreq=3724, maxDocs=44421)
               0.017164804 = queryNorm
             0.21741535 = fieldWeight in 626, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.4786456 = idf(docFreq=3724, maxDocs=44421)
               0.0625 = fieldNorm(doc=626)
         0.054331705 = weight(abstract_txt:three in 626) [ClassicSimilarity], result of:
           0.054331705 = score(doc=626,freq=4.0), product of:
             0.09871711 = queryWeight, product of:
               1.306179 = boost
               4.4030223 = idf(docFreq=1477, maxDocs=44421)
               0.017164804 = queryNorm
             0.5503778 = fieldWeight in 626, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               4.4030223 = idf(docFreq=1477, maxDocs=44421)
               0.0625 = fieldNorm(doc=626)
         0.1857955 = weight(abstract_txt:webometric in 626) [ClassicSimilarity], result of:
           0.1857955 = score(doc=626,freq=2.0), product of:
             0.24661903 = queryWeight, product of:
               1.6856762 = boost
               8.523414 = idf(docFreq=23, maxDocs=44421)
               0.017164804 = queryNorm
             0.75337046 = fieldWeight in 626, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               8.523414 = idf(docFreq=23, maxDocs=44421)
               0.0625 = fieldNorm(doc=626)
         0.10422159 = weight(abstract_txt:consistent in 626) [ClassicSimilarity], result of:
           0.10422159 = score(doc=626,freq=2.0), product of:
             0.19201656 = queryWeight, product of:
               1.8216958 = boost
               6.140786 = idf(docFreq=259, maxDocs=44421)
               0.017164804 = queryNorm
             0.54277396 = fieldWeight in 626, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               6.140786 = idf(docFreq=259, maxDocs=44421)
               0.0625 = fieldNorm(doc=626)
         0.062804416 = weight(abstract_txt:engines in 626) [ClassicSimilarity], result of:
           0.062804416 = score(doc=626,freq=1.0), product of:
             0.18996923 = queryWeight, product of:
               2.092269 = boost
               5.2896495 = idf(docFreq=608, maxDocs=44421)
               0.017164804 = queryNorm
             0.3306031 = fieldWeight in 626, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.2896495 = idf(docFreq=608, maxDocs=44421)
               0.0625 = fieldNorm(doc=626)
         0.06947116 = weight(abstract_txt:search in 626) [ClassicSimilarity], result of:
           0.06947116 = score(doc=626,freq=5.0), product of:
             0.13601911 = queryWeight, product of:
               2.1683104 = boost
               3.654598 = idf(docFreq=3123, maxDocs=44421)
               0.017164804 = queryNorm
             0.5107456 = fieldWeight in 626, product of:
               2.236068 = tf(freq=5.0), with freq of:
                 5.0 = termFreq=5.0
               3.654598 = idf(docFreq=3123, maxDocs=44421)
               0.0625 = fieldNorm(doc=626)
         0.19312845 = weight(abstract_txt:count in 626) [ClassicSimilarity], result of:
           0.19312845 = score(doc=626,freq=2.0), product of:
             0.28968838 = queryWeight, product of:
               2.2375464 = boost
               7.5425844 = idf(docFreq=63, maxDocs=44421)
               0.017164804 = queryNorm
             0.6666766 = fieldWeight in 626, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               7.5425844 = idf(docFreq=63, maxDocs=44421)
               0.0625 = fieldNorm(doc=626)
         0.14295115 = weight(abstract_txt:estimates in 626) [ClassicSimilarity], result of:
           0.14295115 = score(doc=626,freq=1.0), product of:
             0.29865423 = queryWeight, product of:
               2.2719085 = boost
               7.6584163 = idf(docFreq=56, maxDocs=44421)
               0.017164804 = queryNorm
             0.47865102 = fieldWeight in 626, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.6584163 = idf(docFreq=56, maxDocs=44421)
               0.0625 = fieldNorm(doc=626)
         0.32075498 = weight(abstract_txt:yahoo in 626) [ClassicSimilarity], result of:
           0.32075498 = score(doc=626,freq=3.0), product of:
             0.44715908 = queryWeight, product of:
               3.931448 = boost
               6.6262937 = idf(docFreq=159, maxDocs=44421)
               0.017164804 = queryNorm
             0.71731734 = fieldWeight in 626, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               6.6262937 = idf(docFreq=159, maxDocs=44421)
               0.0625 = fieldNorm(doc=626)
       0.36 = coord(9/25)
   

4. López-Huertas, M.J.; Barité Roqueta, M.-G.: Knowledge representation and organization of gender studies on the Internet : towards integration (2003) 0.27

   0.26852137 = sum of:
     0.26852137 = product of:
       0.83912927 = sum of:
         0.01674601 = weight(abstract_txt:results in 3751) [ClassicSimilarity], result of:
           0.01674601 = score(doc=3751,freq=1.0), product of:
             0.0616185 = queryWeight, product of:
               1.0319581 = boost
               3.4786456 = idf(docFreq=3724, maxDocs=44421)
               0.017164804 = queryNorm
             0.2717692 = fieldWeight in 3751, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.4786456 = idf(docFreq=3724, maxDocs=44421)
               0.078125 = fieldNorm(doc=3751)
         0.033957314 = weight(abstract_txt:three in 3751) [ClassicSimilarity], result of:
           0.033957314 = score(doc=3751,freq=1.0), product of:
             0.09871711 = queryWeight, product of:
               1.306179 = boost
               4.4030223 = idf(docFreq=1477, maxDocs=44421)
               0.017164804 = queryNorm
             0.34398612 = fieldWeight in 3751, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.4030223 = idf(docFreq=1477, maxDocs=44421)
               0.078125 = fieldNorm(doc=3751)
         0.08388529 = weight(abstract_txt:quantitative in 3751) [ClassicSimilarity], result of:
           0.08388529 = score(doc=3751,freq=1.0), product of:
             0.18039621 = queryWeight, product of:
               1.7657135 = boost
               5.9520745 = idf(docFreq=313, maxDocs=44421)
               0.017164804 = queryNorm
             0.46500582 = fieldWeight in 3751, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.9520745 = idf(docFreq=313, maxDocs=44421)
               0.078125 = fieldNorm(doc=3751)
         0.09211973 = weight(abstract_txt:consistent in 3751) [ClassicSimilarity], result of:
           0.09211973 = score(doc=3751,freq=1.0), product of:
             0.19201656 = queryWeight, product of:
               1.8216958 = boost
               6.140786 = idf(docFreq=259, maxDocs=44421)
               0.017164804 = queryNorm
             0.4797489 = fieldWeight in 3751, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.140786 = idf(docFreq=259, maxDocs=44421)
               0.078125 = fieldNorm(doc=3751)
         0.13597554 = weight(abstract_txt:engines in 3751) [ClassicSimilarity], result of:
           0.13597554 = score(doc=3751,freq=3.0), product of:
             0.18996923 = queryWeight, product of:
               2.092269 = boost
               5.2896495 = idf(docFreq=608, maxDocs=44421)
               0.017164804 = queryNorm
             0.7157767 = fieldWeight in 3751, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               5.2896495 = idf(docFreq=608, maxDocs=44421)
               0.078125 = fieldNorm(doc=3751)
         0.081811085 = weight(abstract_txt:google in 3751) [ClassicSimilarity], result of:
           0.081811085 = score(doc=3751,freq=1.0), product of:
             0.19526508 = queryWeight, product of:
               2.121232 = boost
               5.3628736 = idf(docFreq=565, maxDocs=44421)
               0.017164804 = queryNorm
             0.4189745 = fieldWeight in 3751, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.3628736 = idf(docFreq=565, maxDocs=44421)
               0.078125 = fieldNorm(doc=3751)
         0.06726516 = weight(abstract_txt:search in 3751) [ClassicSimilarity], result of:
           0.06726516 = score(doc=3751,freq=3.0), product of:
             0.13601911 = queryWeight, product of:
               2.1683104 = boost
               3.654598 = idf(docFreq=3123, maxDocs=44421)
               0.017164804 = queryNorm
             0.49452728 = fieldWeight in 3751, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               3.654598 = idf(docFreq=3123, maxDocs=44421)
               0.078125 = fieldNorm(doc=3751)
         0.32736915 = weight(abstract_txt:yahoo in 3751) [ClassicSimilarity], result of:
           0.32736915 = score(doc=3751,freq=2.0), product of:
             0.44715908 = queryWeight, product of:
               3.931448 = boost
               6.6262937 = idf(docFreq=159, maxDocs=44421)
               0.017164804 = queryNorm
             0.73210895 = fieldWeight in 3751, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               6.6262937 = idf(docFreq=159, maxDocs=44421)
               0.078125 = fieldNorm(doc=3751)
       0.32 = coord(8/25)
   

5. Spink, A.; Jansen, B.J.; Blakely, C.; Koshman, S.: ¬A study of results overlap and uniqueness among major Web search engines (2006) 0.24

   0.23992924 = sum of:
     0.23992924 = product of:
       0.6664701 = sum of:
         0.02455124 = weight(abstract_txt:result in 1993) [ClassicSimilarity], result of:
           0.02455124 = score(doc=1993,freq=1.0), product of:
             0.0881164 = queryWeight, product of:
               1.0076026 = boost
               5.0948176 = idf(docFreq=739, maxDocs=44421)
               0.017164804 = queryNorm
             0.27862284 = fieldWeight in 1993, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.0948176 = idf(docFreq=739, maxDocs=44421)
               0.0546875 = fieldNorm(doc=1993)
         0.03516662 = weight(abstract_txt:results in 1993) [ClassicSimilarity], result of:
           0.03516662 = score(doc=1993,freq=9.0), product of:
             0.0616185 = queryWeight, product of:
               1.0319581 = boost
               3.4786456 = idf(docFreq=3724, maxDocs=44421)
               0.017164804 = queryNorm
             0.5707153 = fieldWeight in 1993, product of:
               3.0 = tf(freq=9.0), with freq of:
                 9.0 = termFreq=9.0
               3.4786456 = idf(docFreq=3724, maxDocs=44421)
               0.0546875 = fieldNorm(doc=1993)
         0.016426476 = weight(abstract_txt:than in 1993) [ClassicSimilarity], result of:
           0.016426476 = score(doc=1993,freq=1.0), product of:
             0.07716158 = queryWeight, product of:
               1.1548008 = boost
               3.8927383 = idf(docFreq=2461, maxDocs=44421)
               0.017164804 = queryNorm
             0.21288413 = fieldWeight in 1993, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.8927383 = idf(docFreq=2461, maxDocs=44421)
               0.0546875 = fieldNorm(doc=1993)
         0.019697804 = weight(abstract_txt:number in 1993) [ClassicSimilarity], result of:
           0.019697804 = score(doc=1993,freq=1.0), product of:
             0.087093025 = queryWeight, product of:
               1.226869 = boost
               4.1356745 = idf(docFreq=1930, maxDocs=44421)
               0.017164804 = queryNorm
             0.2261697 = fieldWeight in 1993, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.1356745 = idf(docFreq=1930, maxDocs=44421)
               0.0546875 = fieldNorm(doc=1993)
         0.033616025 = weight(abstract_txt:three in 1993) [ClassicSimilarity], result of:
           0.033616025 = score(doc=1993,freq=2.0), product of:
             0.09871711 = queryWeight, product of:
               1.306179 = boost
               4.4030223 = idf(docFreq=1477, maxDocs=44421)
               0.017164804 = queryNorm
             0.34052888 = fieldWeight in 1993, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               4.4030223 = idf(docFreq=1477, maxDocs=44421)
               0.0546875 = fieldNorm(doc=1993)
         0.20561855 = weight(abstract_txt:engines in 1993) [ClassicSimilarity], result of:
           0.20561855 = score(doc=1993,freq=14.0), product of:
             0.18996923 = queryWeight, product of:
               2.092269 = boost
               5.2896495 = idf(docFreq=608, maxDocs=44421)
               0.017164804 = queryNorm
             1.0823781 = fieldWeight in 1993, product of:
               3.7416575 = tf(freq=14.0), with freq of:
                 14.0 = termFreq=14.0
               5.2896495 = idf(docFreq=608, maxDocs=44421)
               0.0546875 = fieldNorm(doc=1993)
         0.057267763 = weight(abstract_txt:google in 1993) [ClassicSimilarity], result of:
           0.057267763 = score(doc=1993,freq=1.0), product of:
             0.19526508 = queryWeight, product of:
               2.121232 = boost
               5.3628736 = idf(docFreq=565, maxDocs=44421)
               0.017164804 = queryNorm
             0.29328215 = fieldWeight in 1993, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.3628736 = idf(docFreq=565, maxDocs=44421)
               0.0546875 = fieldNorm(doc=1993)
         0.112086184 = weight(abstract_txt:search in 1993) [ClassicSimilarity], result of:
           0.112086184 = score(doc=1993,freq=17.0), product of:
             0.13601911 = queryWeight, product of:
               2.1683104 = boost
               3.654598 = idf(docFreq=3123, maxDocs=44421)
               0.017164804 = queryNorm
             0.8240473 = fieldWeight in 1993, product of:
               4.1231055 = tf(freq=17.0), with freq of:
                 17.0 = termFreq=17.0
               3.654598 = idf(docFreq=3123, maxDocs=44421)
               0.0546875 = fieldNorm(doc=1993)
         0.16203947 = weight(abstract_txt:yahoo in 1993) [ClassicSimilarity], result of:
           0.16203947 = score(doc=1993,freq=1.0), product of:
             0.44715908 = queryWeight, product of:
               3.931448 = boost
               6.6262937 = idf(docFreq=159, maxDocs=44421)
               0.017164804 = queryNorm
             0.36237544 = fieldWeight in 1993, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.6262937 = idf(docFreq=159, maxDocs=44421)
               0.0546875 = fieldNorm(doc=1993)
       0.36 = coord(9/25)