Document (#29547)

Author

Oppenheim, C.
Morris, A.
McKnight, C.

Title

¬The evaluation of WWW search engines

Source

Journal of documentation. 56(2000) no.2, S.190-211

Year

2000

Abstract

The literature of the evaluation of Internet search engines is reviewed. Although there have been many studies, there has been little consistency in the way such studies have been carried out. This problem is exacerbated by the fact that recall is virtually impossible to calculate in the fast changing Internet environment, and therefore the traditional Cranfield type of evaluation is not usually possible. A variety of alternative evaluation methods has been suggested to overcome this difficulty. The authors recommend that a standardised set of tools is developed for the evaluation of web search engines so that, in future, comparisons can be made between search engines more effectively, and that variations in performance of any given search engine over time can be tracked. The paper itself does not provide such a standard set of tools, but it investigates the issues and makes preliminary recommendations of the types of tools needed

Content

Vgl. auch: http://www.emeraldinsight.com/

Theme

Suchmaschinen
Literaturübersicht
Retrievalstudien

Similar documents (author)

1. Ahmed, S.M.Z.; McKnight, C.; Oppenheim, C.: ¬A study of users' performance and satisfaction with the Web of Science IR interface : making sense of it all (2005) 2.66

   2.6557858 = sum of:
     2.6557858 = product of:
       3.9836786 = sum of:
         1.6373963 = weight(author_txt:oppenheim in 5656) [ClassicSimilarity], result of:
           1.6373963 = score(doc=5656,freq=1.0), product of:
             0.534108 = queryWeight, product of:
               1.0295757 = boost
               8.175107 = idf(docFreq=33, maxDocs=44421)
               0.063456684 = queryNorm
             3.0656652 = fieldWeight in 5656, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               8.175107 = idf(docFreq=33, maxDocs=44421)
               0.375 = fieldNorm(doc=5656)
         2.3462822 = weight(author_txt:mcknight in 5656) [ClassicSimilarity], result of:
           2.3462822 = score(doc=5656,freq=1.0), product of:
             0.6788598 = queryWeight, product of:
               1.1607369 = boost
               9.216561 = idf(docFreq=11, maxDocs=44421)
               0.063456684 = queryNorm
             3.4562106 = fieldWeight in 5656, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               9.216561 = idf(docFreq=11, maxDocs=44421)
               0.375 = fieldNorm(doc=5656)
       0.6666667 = coord(2/3)
   

2. Summers, R.; Oppenheim, C.; Meadows, J.; McKnight, C.; Kinnell, M.: Information science in 2010 : a Loughborough University view (1999) 2.21

   2.2131548 = sum of:
     2.2131548 = product of:
       3.319732 = sum of:
         1.3644968 = weight(author_txt:oppenheim in 5343) [ClassicSimilarity], result of:
           1.3644968 = score(doc=5343,freq=1.0), product of:
             0.534108 = queryWeight, product of:
               1.0295757 = boost
               8.175107 = idf(docFreq=33, maxDocs=44421)
               0.063456684 = queryNorm
             2.5547209 = fieldWeight in 5343, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               8.175107 = idf(docFreq=33, maxDocs=44421)
               0.3125 = fieldNorm(doc=5343)
         1.9552351 = weight(author_txt:mcknight in 5343) [ClassicSimilarity], result of:
           1.9552351 = score(doc=5343,freq=1.0), product of:
             0.6788598 = queryWeight, product of:
               1.1607369 = boost
               9.216561 = idf(docFreq=11, maxDocs=44421)
               0.063456684 = queryNorm
             2.8801754 = fieldWeight in 5343, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               9.216561 = idf(docFreq=11, maxDocs=44421)
               0.3125 = fieldNorm(doc=5343)
       0.6666667 = coord(2/3)
   

3. McKnight, C.: Hypertext and navigation : a problem or a solution? (1993) 1.30

   1.3034902 = sum of:
     1.3034902 = product of:
       3.9104702 = sum of:
         3.9104702 = weight(author_txt:mcknight in 5087) [ClassicSimilarity], result of:
           3.9104702 = score(doc=5087,freq=1.0), product of:
             0.6788598 = queryWeight, product of:
               1.1607369 = boost
               9.216561 = idf(docFreq=11, maxDocs=44421)
               0.063456684 = queryNorm
             5.7603507 = fieldWeight in 5087, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               9.216561 = idf(docFreq=11, maxDocs=44421)
               0.625 = fieldNorm(doc=5087)
       0.33333334 = coord(1/3)
   

4. McKnight, C.: Project CHIRO : Collaborative Hypertext in Research Organisations, final report (1994) 1.30

   1.3034902 = sum of:
     1.3034902 = product of:
       3.9104702 = sum of:
         3.9104702 = weight(author_txt:mcknight in 1125) [ClassicSimilarity], result of:
           3.9104702 = score(doc=1125,freq=1.0), product of:
             0.6788598 = queryWeight, product of:
               1.1607369 = boost
               9.216561 = idf(docFreq=11, maxDocs=44421)
               0.063456684 = queryNorm
             5.7603507 = fieldWeight in 1125, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               9.216561 = idf(docFreq=11, maxDocs=44421)
               0.625 = fieldNorm(doc=1125)
       0.33333334 = coord(1/3)
   

5. McKnight, C.: ¬The personal construction of information space (2000) 1.30

   1.3034902 = sum of:
     1.3034902 = product of:
       3.9104702 = sum of:
         3.9104702 = weight(author_txt:mcknight in 491) [ClassicSimilarity], result of:
           3.9104702 = score(doc=491,freq=1.0), product of:
             0.6788598 = queryWeight, product of:
               1.1607369 = boost
               9.216561 = idf(docFreq=11, maxDocs=44421)
               0.063456684 = queryNorm
             5.7603507 = fieldWeight in 491, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               9.216561 = idf(docFreq=11, maxDocs=44421)
               0.625 = fieldNorm(doc=491)
       0.33333334 = coord(1/3)
   

Similar documents (content)

1. Borlund, P.; Ruthven, I.: Introduction to the special issue on evaluating interactive information retrieval systems (2008) 0.35

   0.34728497 = sum of:
     0.34728497 = product of:
       0.7235104 = sum of:
         0.02571429 = weight(abstract_txt:have in 3019) [ClassicSimilarity], result of:
           0.02571429 = score(doc=3019,freq=6.0), product of:
             0.069998816 = queryWeight, product of:
               1.0084941 = boost
               3.199388 = idf(docFreq=4924, maxDocs=44421)
               0.021694537 = queryNorm
             0.3673532 = fieldWeight in 3019, product of:
               2.4494898 = tf(freq=6.0), with freq of:
                 6.0 = termFreq=6.0
               3.199388 = idf(docFreq=4924, maxDocs=44421)
               0.046875 = fieldNorm(doc=3019)
         0.04548575 = weight(abstract_txt:difficulty in 3019) [ClassicSimilarity], result of:
           0.04548575 = score(doc=3019,freq=1.0), product of:
             0.14766073 = queryWeight, product of:
               1.0357276 = boost
               6.571569 = idf(docFreq=168, maxDocs=44421)
               0.021694537 = queryNorm
             0.3080423 = fieldWeight in 3019, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.571569 = idf(docFreq=168, maxDocs=44421)
               0.046875 = fieldNorm(doc=3019)
         0.01814998 = weight(abstract_txt:such in 3019) [ClassicSimilarity], result of:
           0.01814998 = score(doc=3019,freq=2.0), product of:
             0.08003235 = queryWeight, product of:
               1.0783527 = boost
               3.42101 = idf(docFreq=3945, maxDocs=44421)
               0.021694537 = queryNorm
             0.22678305 = fieldWeight in 3019, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               3.42101 = idf(docFreq=3945, maxDocs=44421)
               0.046875 = fieldNorm(doc=3019)
         0.016617104 = weight(abstract_txt:internet in 3019) [ClassicSimilarity], result of:
           0.016617104 = score(doc=3019,freq=1.0), product of:
             0.095073976 = queryWeight, product of:
               1.1753274 = boost
               3.7286568 = idf(docFreq=2900, maxDocs=44421)
               0.021694537 = queryNorm
             0.17478079 = fieldWeight in 3019, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.7286568 = idf(docFreq=2900, maxDocs=44421)
               0.046875 = fieldNorm(doc=3019)
         0.089531265 = weight(abstract_txt:cranfield in 3019) [ClassicSimilarity], result of:
           0.089531265 = score(doc=3019,freq=1.0), product of:
             0.2319163 = queryWeight, product of:
               1.2980119 = boost
               8.235732 = idf(docFreq=31, maxDocs=44421)
               0.021694537 = queryNorm
             0.38604993 = fieldWeight in 3019, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               8.235732 = idf(docFreq=31, maxDocs=44421)
               0.046875 = fieldNorm(doc=3019)
         0.024712596 = weight(abstract_txt:studies in 3019) [ClassicSimilarity], result of:
           0.024712596 = score(doc=3019,freq=1.0), product of:
             0.12387121 = queryWeight, product of:
               1.3415697 = boost
               4.25605 = idf(docFreq=1711, maxDocs=44421)
               0.021694537 = queryNorm
             0.19950235 = fieldWeight in 3019, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.25605 = idf(docFreq=1711, maxDocs=44421)
               0.046875 = fieldNorm(doc=3019)
         0.014687452 = weight(abstract_txt:that in 3019) [ClassicSimilarity], result of:
           0.014687452 = score(doc=3019,freq=3.0), product of:
             0.07649364 = queryWeight, product of:
               1.4909247 = boost
               2.3649352 = idf(docFreq=11344, maxDocs=44421)
               0.021694537 = queryNorm
             0.1920088 = fieldWeight in 3019, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               2.3649352 = idf(docFreq=11344, maxDocs=44421)
               0.046875 = fieldNorm(doc=3019)
         0.05986945 = weight(abstract_txt:tools in 3019) [ClassicSimilarity], result of:
           0.05986945 = score(doc=3019,freq=2.0), product of:
             0.20300905 = queryWeight, product of:
               2.103446 = boost
               4.448705 = idf(docFreq=1411, maxDocs=44421)
               0.021694537 = queryNorm
             0.29491025 = fieldWeight in 3019, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               4.448705 = idf(docFreq=1411, maxDocs=44421)
               0.046875 = fieldNorm(doc=3019)
         0.030272758 = weight(abstract_txt:been in 3019) [ClassicSimilarity], result of:
           0.030272758 = score(doc=3019,freq=1.0), product of:
             0.17867732 = queryWeight, product of:
               2.2786508 = boost
               3.614442 = idf(docFreq=3251, maxDocs=44421)
               0.021694537 = queryNorm
             0.16942698 = fieldWeight in 3019, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.614442 = idf(docFreq=3251, maxDocs=44421)
               0.046875 = fieldNorm(doc=3019)
         0.087466545 = weight(abstract_txt:search in 3019) [ClassicSimilarity], result of:
           0.087466545 = score(doc=3019,freq=5.0), product of:
             0.22833689 = queryWeight, product of:
               2.8799574 = boost
               3.654598 = idf(docFreq=3123, maxDocs=44421)
               0.021694537 = queryNorm
             0.3830592 = fieldWeight in 3019, product of:
               2.236068 = tf(freq=5.0), with freq of:
                 5.0 = termFreq=5.0
               3.654598 = idf(docFreq=3123, maxDocs=44421)
               0.046875 = fieldNorm(doc=3019)
         0.09488746 = weight(abstract_txt:engines in 3019) [ClassicSimilarity], result of:
           0.09488746 = score(doc=3019,freq=1.0), product of:
             0.3826843 = queryWeight, product of:
               3.3347507 = boost
               5.2896495 = idf(docFreq=608, maxDocs=44421)
               0.021694537 = queryNorm
             0.24795231 = fieldWeight in 3019, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.2896495 = idf(docFreq=608, maxDocs=44421)
               0.046875 = fieldNorm(doc=3019)
         0.21611574 = weight(abstract_txt:evaluation in 3019) [ClassicSimilarity], result of:
           0.21611574 = score(doc=3019,freq=9.0), product of:
             0.34306905 = queryWeight, product of:
               3.5301147 = boost
               4.479632 = idf(docFreq=1368, maxDocs=44421)
               0.021694537 = queryNorm
             0.62994826 = fieldWeight in 3019, product of:
               3.0 = tf(freq=9.0), with freq of:
                 9.0 = termFreq=9.0
               4.479632 = idf(docFreq=1368, maxDocs=44421)
               0.046875 = fieldNorm(doc=3019)
       0.48 = coord(12/25)
   

2. Harter, S.P.; Hert, C.A.: Evaluation of information retrieval systems : approaches, issues, and methods (1997) 0.33

   0.32774487 = sum of:
     0.32774487 = product of:
       0.91040236 = sum of:
         0.017496359 = weight(abstract_txt:have in 3264) [ClassicSimilarity], result of:
           0.017496359 = score(doc=3264,freq=1.0), product of:
             0.069998816 = queryWeight, product of:
               1.0084941 = boost
               3.199388 = idf(docFreq=4924, maxDocs=44421)
               0.021694537 = queryNorm
             0.2499522 = fieldWeight in 3264, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.199388 = idf(docFreq=4924, maxDocs=44421)
               0.078125 = fieldNorm(doc=3264)
         0.04796945 = weight(abstract_txt:internet in 3264) [ClassicSimilarity], result of:
           0.04796945 = score(doc=3264,freq=3.0), product of:
             0.095073976 = queryWeight, product of:
               1.1753274 = boost
               3.7286568 = idf(docFreq=2900, maxDocs=44421)
               0.021694537 = queryNorm
             0.50454867 = fieldWeight in 3264, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               3.7286568 = idf(docFreq=2900, maxDocs=44421)
               0.078125 = fieldNorm(doc=3264)
         0.11254868 = weight(abstract_txt:impossible in 3264) [ClassicSimilarity], result of:
           0.11254868 = score(doc=3264,freq=1.0), product of:
             0.1921657 = queryWeight, product of:
               1.1815469 = boost
               7.496775 = idf(docFreq=66, maxDocs=44421)
               0.021694537 = queryNorm
             0.58568555 = fieldWeight in 3264, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.496775 = idf(docFreq=66, maxDocs=44421)
               0.078125 = fieldNorm(doc=3264)
         0.33366334 = weight(abstract_txt:cranfield in 3264) [ClassicSimilarity], result of:
           0.33366334 = score(doc=3264,freq=5.0), product of:
             0.2319163 = queryWeight, product of:
               1.2980119 = boost
               8.235732 = idf(docFreq=31, maxDocs=44421)
               0.021694537 = queryNorm
             1.4387232 = fieldWeight in 3264, product of:
               2.236068 = tf(freq=5.0), with freq of:
                 5.0 = termFreq=5.0
               8.235732 = idf(docFreq=31, maxDocs=44421)
               0.078125 = fieldNorm(doc=3264)
         0.041187663 = weight(abstract_txt:studies in 3264) [ClassicSimilarity], result of:
           0.041187663 = score(doc=3264,freq=1.0), product of:
             0.12387121 = queryWeight, product of:
               1.3415697 = boost
               4.25605 = idf(docFreq=1711, maxDocs=44421)
               0.021694537 = queryNorm
             0.3325039 = fieldWeight in 3264, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.25605 = idf(docFreq=1711, maxDocs=44421)
               0.078125 = fieldNorm(doc=3264)
         0.014133008 = weight(abstract_txt:that in 3264) [ClassicSimilarity], result of:
           0.014133008 = score(doc=3264,freq=1.0), product of:
             0.07649364 = queryWeight, product of:
               1.4909247 = boost
               2.3649352 = idf(docFreq=11344, maxDocs=44421)
               0.021694537 = queryNorm
             0.18476056 = fieldWeight in 3264, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               2.3649352 = idf(docFreq=11344, maxDocs=44421)
               0.078125 = fieldNorm(doc=3264)
         0.06519371 = weight(abstract_txt:search in 3264) [ClassicSimilarity], result of:
           0.06519371 = score(doc=3264,freq=1.0), product of:
             0.22833689 = queryWeight, product of:
               2.8799574 = boost
               3.654598 = idf(docFreq=3123, maxDocs=44421)
               0.021694537 = queryNorm
             0.28551546 = fieldWeight in 3264, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.654598 = idf(docFreq=3123, maxDocs=44421)
               0.078125 = fieldNorm(doc=3264)
         0.15814577 = weight(abstract_txt:engines in 3264) [ClassicSimilarity], result of:
           0.15814577 = score(doc=3264,freq=1.0), product of:
             0.3826843 = queryWeight, product of:
               3.3347507 = boost
               5.2896495 = idf(docFreq=608, maxDocs=44421)
               0.021694537 = queryNorm
             0.41325387 = fieldWeight in 3264, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.2896495 = idf(docFreq=608, maxDocs=44421)
               0.078125 = fieldNorm(doc=3264)
         0.120064296 = weight(abstract_txt:evaluation in 3264) [ClassicSimilarity], result of:
           0.120064296 = score(doc=3264,freq=1.0), product of:
             0.34306905 = queryWeight, product of:
               3.5301147 = boost
               4.479632 = idf(docFreq=1368, maxDocs=44421)
               0.021694537 = queryNorm
             0.34997123 = fieldWeight in 3264, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.479632 = idf(docFreq=1368, maxDocs=44421)
               0.078125 = fieldNorm(doc=3264)
       0.36 = coord(9/25)
   

3. Chau, M.; Wong, C.H.; Zhou, Y.; Qin, J.; Chen, H.: Evaluating the use of search engine development tools in IT education (2010) 0.25

   0.25122273 = sum of:
     0.25122273 = product of:
       0.6978409 = sum of:
         0.013997085 = weight(abstract_txt:have in 312) [ClassicSimilarity], result of:
           0.013997085 = score(doc=312,freq=1.0), product of:
             0.069998816 = queryWeight, product of:
               1.0084941 = boost
               3.199388 = idf(docFreq=4924, maxDocs=44421)
               0.021694537 = queryNorm
             0.19996175 = fieldWeight in 312, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.199388 = idf(docFreq=4924, maxDocs=44421)
               0.0625 = fieldNorm(doc=312)
         0.017111966 = weight(abstract_txt:such in 312) [ClassicSimilarity], result of:
           0.017111966 = score(doc=312,freq=1.0), product of:
             0.08003235 = queryWeight, product of:
               1.0783527 = boost
               3.42101 = idf(docFreq=3945, maxDocs=44421)
               0.021694537 = queryNorm
             0.21381313 = fieldWeight in 312, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.42101 = idf(docFreq=3945, maxDocs=44421)
               0.0625 = fieldNorm(doc=312)
         0.038375556 = weight(abstract_txt:internet in 312) [ClassicSimilarity], result of:
           0.038375556 = score(doc=312,freq=3.0), product of:
             0.095073976 = queryWeight, product of:
               1.1753274 = boost
               3.7286568 = idf(docFreq=2900, maxDocs=44421)
               0.021694537 = queryNorm
             0.40363893 = fieldWeight in 312, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               3.7286568 = idf(docFreq=2900, maxDocs=44421)
               0.0625 = fieldNorm(doc=312)
         0.01958327 = weight(abstract_txt:that in 312) [ClassicSimilarity], result of:
           0.01958327 = score(doc=312,freq=3.0), product of:
             0.07649364 = queryWeight, product of:
               1.4909247 = boost
               2.3649352 = idf(docFreq=11344, maxDocs=44421)
               0.021694537 = queryNorm
             0.25601172 = fieldWeight in 312, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               2.3649352 = idf(docFreq=11344, maxDocs=44421)
               0.0625 = fieldNorm(doc=312)
         0.14934066 = weight(abstract_txt:tools in 312) [ClassicSimilarity], result of:
           0.14934066 = score(doc=312,freq=7.0), product of:
             0.20300905 = queryWeight, product of:
               2.103446 = boost
               4.448705 = idf(docFreq=1411, maxDocs=44421)
               0.021694537 = queryNorm
             0.73563546 = fieldWeight in 312, product of:
               2.6457512 = tf(freq=7.0), with freq of:
                 7.0 = termFreq=7.0
               4.448705 = idf(docFreq=1411, maxDocs=44421)
               0.0625 = fieldNorm(doc=312)
         0.040363677 = weight(abstract_txt:been in 312) [ClassicSimilarity], result of:
           0.040363677 = score(doc=312,freq=1.0), product of:
             0.17867732 = queryWeight, product of:
               2.2786508 = boost
               3.614442 = idf(docFreq=3251, maxDocs=44421)
               0.021694537 = queryNorm
             0.22590263 = fieldWeight in 312, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.614442 = idf(docFreq=3251, maxDocs=44421)
               0.0625 = fieldNorm(doc=312)
         0.10430994 = weight(abstract_txt:search in 312) [ClassicSimilarity], result of:
           0.10430994 = score(doc=312,freq=4.0), product of:
             0.22833689 = queryWeight, product of:
               2.8799574 = boost
               3.654598 = idf(docFreq=3123, maxDocs=44421)
               0.021694537 = queryNorm
             0.45682475 = fieldWeight in 312, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               3.654598 = idf(docFreq=3123, maxDocs=44421)
               0.0625 = fieldNorm(doc=312)
         0.1789215 = weight(abstract_txt:engines in 312) [ClassicSimilarity], result of:
           0.1789215 = score(doc=312,freq=2.0), product of:
             0.3826843 = queryWeight, product of:
               3.3347507 = boost
               5.2896495 = idf(docFreq=608, maxDocs=44421)
               0.021694537 = queryNorm
             0.46754336 = fieldWeight in 312, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               5.2896495 = idf(docFreq=608, maxDocs=44421)
               0.0625 = fieldNorm(doc=312)
         0.13583724 = weight(abstract_txt:evaluation in 312) [ClassicSimilarity], result of:
           0.13583724 = score(doc=312,freq=2.0), product of:
             0.34306905 = queryWeight, product of:
               3.5301147 = boost
               4.479632 = idf(docFreq=1368, maxDocs=44421)
               0.021694537 = queryNorm
             0.39594725 = fieldWeight in 312, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               4.479632 = idf(docFreq=1368, maxDocs=44421)
               0.0625 = fieldNorm(doc=312)
       0.36 = coord(9/25)
   

4. Hastings, S.K.: Evaluation of image retrieval systems : role of user feedback (1999) 0.23

   0.23157468 = sum of:
     0.23157468 = product of:
       0.643263 = sum of:
         0.068231896 = weight(abstract_txt:preliminary in 970) [ClassicSimilarity], result of:
           0.068231896 = score(doc=970,freq=1.0), product of:
             0.13764927 = queryWeight, product of:
               6.3448815 = idf(docFreq=211, maxDocs=44421)
               0.021694537 = queryNorm
             0.49569386 = fieldWeight in 970, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.3448815 = idf(docFreq=211, maxDocs=44421)
               0.078125 = fieldNorm(doc=970)
         0.017496359 = weight(abstract_txt:have in 970) [ClassicSimilarity], result of:
           0.017496359 = score(doc=970,freq=1.0), product of:
             0.069998816 = queryWeight, product of:
               1.0084941 = boost
               3.199388 = idf(docFreq=4924, maxDocs=44421)
               0.021694537 = queryNorm
             0.2499522 = fieldWeight in 970, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.199388 = idf(docFreq=4924, maxDocs=44421)
               0.078125 = fieldNorm(doc=970)
         0.085838385 = weight(abstract_txt:comparisons in 970) [ClassicSimilarity], result of:
           0.085838385 = score(doc=970,freq=1.0), product of:
             0.16041192 = queryWeight, product of:
               1.0795217 = boost
               6.849437 = idf(docFreq=127, maxDocs=44421)
               0.021694537 = queryNorm
             0.53511226 = fieldWeight in 970, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.849437 = idf(docFreq=127, maxDocs=44421)
               0.078125 = fieldNorm(doc=970)
         0.03666214 = weight(abstract_txt:there in 970) [ClassicSimilarity], result of:
           0.03666214 = score(doc=970,freq=1.0), product of:
             0.11462275 = queryWeight, product of:
               1.2905161 = boost
               4.094086 = idf(docFreq=2012, maxDocs=44421)
               0.021694537 = queryNorm
             0.31985047 = fieldWeight in 970, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.094086 = idf(docFreq=2012, maxDocs=44421)
               0.078125 = fieldNorm(doc=970)
         0.07133912 = weight(abstract_txt:studies in 970) [ClassicSimilarity], result of:
           0.07133912 = score(doc=970,freq=3.0), product of:
             0.12387121 = queryWeight, product of:
               1.3415697 = boost
               4.25605 = idf(docFreq=1711, maxDocs=44421)
               0.021694537 = queryNorm
             0.57591367 = fieldWeight in 970, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               4.25605 = idf(docFreq=1711, maxDocs=44421)
               0.078125 = fieldNorm(doc=970)
         0.019987093 = weight(abstract_txt:that in 970) [ClassicSimilarity], result of:
           0.019987093 = score(doc=970,freq=2.0), product of:
             0.07649364 = queryWeight, product of:
               1.4909247 = boost
               2.3649352 = idf(docFreq=11344, maxDocs=44421)
               0.021694537 = queryNorm
             0.2612909 = fieldWeight in 970, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               2.3649352 = idf(docFreq=11344, maxDocs=44421)
               0.078125 = fieldNorm(doc=970)
         0.070556834 = weight(abstract_txt:tools in 970) [ClassicSimilarity], result of:
           0.070556834 = score(doc=970,freq=1.0), product of:
             0.20300905 = queryWeight, product of:
               2.103446 = boost
               4.448705 = idf(docFreq=1411, maxDocs=44421)
               0.021694537 = queryNorm
             0.3475551 = fieldWeight in 970, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.448705 = idf(docFreq=1411, maxDocs=44421)
               0.078125 = fieldNorm(doc=970)
         0.06519371 = weight(abstract_txt:search in 970) [ClassicSimilarity], result of:
           0.06519371 = score(doc=970,freq=1.0), product of:
             0.22833689 = queryWeight, product of:
               2.8799574 = boost
               3.654598 = idf(docFreq=3123, maxDocs=44421)
               0.021694537 = queryNorm
             0.28551546 = fieldWeight in 970, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.654598 = idf(docFreq=3123, maxDocs=44421)
               0.078125 = fieldNorm(doc=970)
         0.20795746 = weight(abstract_txt:evaluation in 970) [ClassicSimilarity], result of:
           0.20795746 = score(doc=970,freq=3.0), product of:
             0.34306905 = queryWeight, product of:
               3.5301147 = boost
               4.479632 = idf(docFreq=1368, maxDocs=44421)
               0.021694537 = queryNorm
             0.606168 = fieldWeight in 970, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               4.479632 = idf(docFreq=1368, maxDocs=44421)
               0.078125 = fieldNorm(doc=970)
       0.36 = coord(9/25)
   

5. Jansen, B.J.; Spink, A.: How are we searching the World Wide Web? : A comparison of nine search engine transaction logs (2006) 0.19

   0.19277963 = sum of:
     0.19277963 = product of:
       0.6884987 = sum of:
         0.013997085 = weight(abstract_txt:have in 1968) [ClassicSimilarity], result of:
           0.013997085 = score(doc=1968,freq=1.0), product of:
             0.069998816 = queryWeight, product of:
               1.0084941 = boost
               3.199388 = idf(docFreq=4924, maxDocs=44421)
               0.021694537 = queryNorm
             0.19996175 = fieldWeight in 1968, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.199388 = idf(docFreq=4924, maxDocs=44421)
               0.0625 = fieldNorm(doc=1968)
         0.029329713 = weight(abstract_txt:there in 1968) [ClassicSimilarity], result of:
           0.029329713 = score(doc=1968,freq=1.0), product of:
             0.11462275 = queryWeight, product of:
               1.2905161 = boost
               4.094086 = idf(docFreq=2012, maxDocs=44421)
               0.021694537 = queryNorm
             0.2558804 = fieldWeight in 1968, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.094086 = idf(docFreq=2012, maxDocs=44421)
               0.0625 = fieldNorm(doc=1968)
         0.04659852 = weight(abstract_txt:studies in 1968) [ClassicSimilarity], result of:
           0.04659852 = score(doc=1968,freq=2.0), product of:
             0.12387121 = queryWeight, product of:
               1.3415697 = boost
               4.25605 = idf(docFreq=1711, maxDocs=44421)
               0.021694537 = queryNorm
             0.37618524 = fieldWeight in 1968, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               4.25605 = idf(docFreq=1711, maxDocs=44421)
               0.0625 = fieldNorm(doc=1968)
         0.011306407 = weight(abstract_txt:that in 1968) [ClassicSimilarity], result of:
           0.011306407 = score(doc=1968,freq=1.0), product of:
             0.07649364 = queryWeight, product of:
               1.4909247 = boost
               2.3649352 = idf(docFreq=11344, maxDocs=44421)
               0.021694537 = queryNorm
             0.14780845 = fieldWeight in 1968, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               2.3649352 = idf(docFreq=11344, maxDocs=44421)
               0.0625 = fieldNorm(doc=1968)
         0.056445464 = weight(abstract_txt:tools in 1968) [ClassicSimilarity], result of:
           0.056445464 = score(doc=1968,freq=1.0), product of:
             0.20300905 = queryWeight, product of:
               2.103446 = boost
               4.448705 = idf(docFreq=1411, maxDocs=44421)
               0.021694537 = queryNorm
             0.27804407 = fieldWeight in 1968, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.448705 = idf(docFreq=1411, maxDocs=44421)
               0.0625 = fieldNorm(doc=1968)
         0.17297848 = weight(abstract_txt:search in 1968) [ClassicSimilarity], result of:
           0.17297848 = score(doc=1968,freq=11.0), product of:
             0.22833689 = queryWeight, product of:
               2.8799574 = boost
               3.654598 = idf(docFreq=3123, maxDocs=44421)
               0.021694537 = queryNorm
             0.75755817 = fieldWeight in 1968, product of:
               3.3166249 = tf(freq=11.0), with freq of:
                 11.0 = termFreq=11.0
               3.654598 = idf(docFreq=3123, maxDocs=44421)
               0.0625 = fieldNorm(doc=1968)
         0.357843 = weight(abstract_txt:engines in 1968) [ClassicSimilarity], result of:
           0.357843 = score(doc=1968,freq=8.0), product of:
             0.3826843 = queryWeight, product of:
               3.3347507 = boost
               5.2896495 = idf(docFreq=608, maxDocs=44421)
               0.021694537 = queryNorm
             0.9350867 = fieldWeight in 1968, product of:
               2.828427 = tf(freq=8.0), with freq of:
                 8.0 = termFreq=8.0
               5.2896495 = idf(docFreq=608, maxDocs=44421)
               0.0625 = fieldNorm(doc=1968)
       0.28 = coord(7/25)