Document (#11285)

Author
Robertson, S.E.
Walker, S.
Beaulieu, M.
Title
Laboratory experiments with Okapi : participation in the TREC programme
Source
Journal of documentation. 53(1997) no.1, S.20-34
Year
1997
Abstract
Briefly reviews the history of laboratory testing of information retrieval systems, focusing on the idea of a general purpose test collection of documents, queries and relevance judgements. Gives an overview of the methods used in TREC (Text Retrieval Conference) which is concerned with an ideal test collection, and discusses the Okapi team's participation in TREC. Also discusses some of the issues surrounding the difficult problem of interactive evaluation in TREC. The reconciliation of the requirements of the laboratory context with the concerns of interactive retrieval has a long way to go
Content
Vgl. auch unter: http://www.emeraldinsight.com/10.1108/EUM0000000007188.
Footnote
Contribution to a thematic issue on Okapi and information retrieval research
Theme
Retrievalstudien
Object
Okapi

Similar documents (author)

  1. Robertson, S.E.; Walker, S.; Beaulieu, M.: Experimentation as a way of life : Okapi at TREC (2000) 4.97
    4.9708977 = sum of:
      4.9708977 = sum of:
        1.4444145 = weight(author_txt:robertson in 6098) [ClassicSimilarity], result of:
          1.4444145 = score(doc=6098,freq=1.0), product of:
            0.52623856 = queryWeight, product of:
              7.319441 = idf(docFreq=79, maxDocs=44421)
              0.07189601 = queryNorm
            2.7447903 = fieldWeight in 6098, product of:
              1.0 = tf(freq=1.0), with freq of:
                1.0 = termFreq=1.0
              7.319441 = idf(docFreq=79, maxDocs=44421)
              0.375 = fieldNorm(doc=6098)
        1.6660296 = weight(author_txt:walker in 6098) [ClassicSimilarity], result of:
          1.6660296 = score(doc=6098,freq=1.0), product of:
            0.5787752 = queryWeight, product of:
              1.0487298 = boost
              7.676116 = idf(docFreq=55, maxDocs=44421)
              0.07189601 = queryNorm
            2.8785434 = fieldWeight in 6098, product of:
              1.0 = tf(freq=1.0), with freq of:
                1.0 = termFreq=1.0
              7.676116 = idf(docFreq=55, maxDocs=44421)
              0.375 = fieldNorm(doc=6098)
        1.8604537 = weight(author_txt:beaulieu in 6098) [ClassicSimilarity], result of:
          1.8604537 = score(doc=6098,freq=1.0), product of:
            0.62297034 = queryWeight, product of:
              1.0880337 = boost
              7.963798 = idf(docFreq=41, maxDocs=44421)
              0.07189601 = queryNorm
            2.9864242 = fieldWeight in 6098, product of:
              1.0 = tf(freq=1.0), with freq of:
                1.0 = termFreq=1.0
              7.963798 = idf(docFreq=41, maxDocs=44421)
              0.375 = fieldNorm(doc=6098)
    
  2. Robertson, S.E.; Walker, S.; Hancock-Beaulieu, M.M.: Large test collection experiments of an operational, interactive system : OKAPI at TREC (1995) 4.97
    4.9708977 = sum of:
      4.9708977 = sum of:
        1.4444145 = weight(author_txt:robertson in 33) [ClassicSimilarity], result of:
          1.4444145 = score(doc=33,freq=1.0), product of:
            0.52623856 = queryWeight, product of:
              7.319441 = idf(docFreq=79, maxDocs=44421)
              0.07189601 = queryNorm
            2.7447903 = fieldWeight in 33, product of:
              1.0 = tf(freq=1.0), with freq of:
                1.0 = termFreq=1.0
              7.319441 = idf(docFreq=79, maxDocs=44421)
              0.375 = fieldNorm(doc=33)
        1.6660296 = weight(author_txt:walker in 33) [ClassicSimilarity], result of:
          1.6660296 = score(doc=33,freq=1.0), product of:
            0.5787752 = queryWeight, product of:
              1.0487298 = boost
              7.676116 = idf(docFreq=55, maxDocs=44421)
              0.07189601 = queryNorm
            2.8785434 = fieldWeight in 33, product of:
              1.0 = tf(freq=1.0), with freq of:
                1.0 = termFreq=1.0
              7.676116 = idf(docFreq=55, maxDocs=44421)
              0.375 = fieldNorm(doc=33)
        1.8604537 = weight(author_txt:beaulieu in 33) [ClassicSimilarity], result of:
          1.8604537 = score(doc=33,freq=1.0), product of:
            0.62297034 = queryWeight, product of:
              1.0880337 = boost
              7.963798 = idf(docFreq=41, maxDocs=44421)
              0.07189601 = queryNorm
            2.9864242 = fieldWeight in 33, product of:
              1.0 = tf(freq=1.0), with freq of:
                1.0 = termFreq=1.0
              7.963798 = idf(docFreq=41, maxDocs=44421)
              0.375 = fieldNorm(doc=33)
    
  3. Robertson, S.E.; Walker, S.; Beaulieu, M.M.; Gatford, M.; Payne, A.: Okapi at TREC-4 (1996) 4.14
    4.142415 = sum of:
      4.142415 = sum of:
        1.2036788 = weight(author_txt:robertson in 615) [ClassicSimilarity], result of:
          1.2036788 = score(doc=615,freq=1.0), product of:
            0.52623856 = queryWeight, product of:
              7.319441 = idf(docFreq=79, maxDocs=44421)
              0.07189601 = queryNorm
            2.2873254 = fieldWeight in 615, product of:
              1.0 = tf(freq=1.0), with freq of:
                1.0 = termFreq=1.0
              7.319441 = idf(docFreq=79, maxDocs=44421)
              0.3125 = fieldNorm(doc=615)
        1.3883581 = weight(author_txt:walker in 615) [ClassicSimilarity], result of:
          1.3883581 = score(doc=615,freq=1.0), product of:
            0.5787752 = queryWeight, product of:
              1.0487298 = boost
              7.676116 = idf(docFreq=55, maxDocs=44421)
              0.07189601 = queryNorm
            2.3987863 = fieldWeight in 615, product of:
              1.0 = tf(freq=1.0), with freq of:
                1.0 = termFreq=1.0
              7.676116 = idf(docFreq=55, maxDocs=44421)
              0.3125 = fieldNorm(doc=615)
        1.5503781 = weight(author_txt:beaulieu in 615) [ClassicSimilarity], result of:
          1.5503781 = score(doc=615,freq=1.0), product of:
            0.62297034 = queryWeight, product of:
              1.0880337 = boost
              7.963798 = idf(docFreq=41, maxDocs=44421)
              0.07189601 = queryNorm
            2.4886868 = fieldWeight in 615, product of:
              1.0 = tf(freq=1.0), with freq of:
                1.0 = termFreq=1.0
              7.963798 = idf(docFreq=41, maxDocs=44421)
              0.3125 = fieldNorm(doc=615)
    
  4. Jones, S.; Gatford, M.; Robertson, S.; Hancock-Beaulieu, M.; Secker, J.; Walker, S.: Interactive thesaurus navigation : intelligence rules OK? (1995) 3.31
    3.313932 = sum of:
      3.313932 = sum of:
        0.962943 = weight(author_txt:robertson in 248) [ClassicSimilarity], result of:
          0.962943 = score(doc=248,freq=1.0), product of:
            0.52623856 = queryWeight, product of:
              7.319441 = idf(docFreq=79, maxDocs=44421)
              0.07189601 = queryNorm
            1.8298602 = fieldWeight in 248, product of:
              1.0 = tf(freq=1.0), with freq of:
                1.0 = termFreq=1.0
              7.319441 = idf(docFreq=79, maxDocs=44421)
              0.25 = fieldNorm(doc=248)
        1.1106864 = weight(author_txt:walker in 248) [ClassicSimilarity], result of:
          1.1106864 = score(doc=248,freq=1.0), product of:
            0.5787752 = queryWeight, product of:
              1.0487298 = boost
              7.676116 = idf(docFreq=55, maxDocs=44421)
              0.07189601 = queryNorm
            1.919029 = fieldWeight in 248, product of:
              1.0 = tf(freq=1.0), with freq of:
                1.0 = termFreq=1.0
              7.676116 = idf(docFreq=55, maxDocs=44421)
              0.25 = fieldNorm(doc=248)
        1.2403024 = weight(author_txt:beaulieu in 248) [ClassicSimilarity], result of:
          1.2403024 = score(doc=248,freq=1.0), product of:
            0.62297034 = queryWeight, product of:
              1.0880337 = boost
              7.963798 = idf(docFreq=41, maxDocs=44421)
              0.07189601 = queryNorm
            1.9909495 = fieldWeight in 248, product of:
              1.0 = tf(freq=1.0), with freq of:
                1.0 = termFreq=1.0
              7.963798 = idf(docFreq=41, maxDocs=44421)
              0.25 = fieldNorm(doc=248)
    
  5. Beaulieu, M.M.; Gatford, M.; Huang, X.; Robertson, S.E.; Walker, S.; Williams, P.: Okapi an TREC-5 (1997) 3.31
    3.313932 = sum of:
      3.313932 = sum of:
        0.962943 = weight(author_txt:robertson in 4097) [ClassicSimilarity], result of:
          0.962943 = score(doc=4097,freq=1.0), product of:
            0.52623856 = queryWeight, product of:
              7.319441 = idf(docFreq=79, maxDocs=44421)
              0.07189601 = queryNorm
            1.8298602 = fieldWeight in 4097, product of:
              1.0 = tf(freq=1.0), with freq of:
                1.0 = termFreq=1.0
              7.319441 = idf(docFreq=79, maxDocs=44421)
              0.25 = fieldNorm(doc=4097)
        1.1106864 = weight(author_txt:walker in 4097) [ClassicSimilarity], result of:
          1.1106864 = score(doc=4097,freq=1.0), product of:
            0.5787752 = queryWeight, product of:
              1.0487298 = boost
              7.676116 = idf(docFreq=55, maxDocs=44421)
              0.07189601 = queryNorm
            1.919029 = fieldWeight in 4097, product of:
              1.0 = tf(freq=1.0), with freq of:
                1.0 = termFreq=1.0
              7.676116 = idf(docFreq=55, maxDocs=44421)
              0.25 = fieldNorm(doc=4097)
        1.2403024 = weight(author_txt:beaulieu in 4097) [ClassicSimilarity], result of:
          1.2403024 = score(doc=4097,freq=1.0), product of:
            0.62297034 = queryWeight, product of:
              1.0880337 = boost
              7.963798 = idf(docFreq=41, maxDocs=44421)
              0.07189601 = queryNorm
            1.9909495 = fieldWeight in 4097, product of:
              1.0 = tf(freq=1.0), with freq of:
                1.0 = termFreq=1.0
              7.963798 = idf(docFreq=41, maxDocs=44421)
              0.25 = fieldNorm(doc=4097)
    

Similar documents (content)

  1. Beaulieu, M.; Robertson, S.; Rasmussen, E.: Evaluating interactive systems in TREC (1996) 0.42
    0.41521645 = sum of:
      0.41521645 = product of:
        1.4829159 = sum of:
          0.049126387 = weight(abstract_txt:experiments in 3066) [ClassicSimilarity], result of:
            0.049126387 = score(doc=3066,freq=2.0), product of:
              0.08350477 = queryWeight, product of:
                5.324741 = idf(docFreq=587, maxDocs=44421)
                0.01568241 = queryNorm
              0.5883063 = fieldWeight in 3066, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                5.324741 = idf(docFreq=587, maxDocs=44421)
                0.078125 = fieldNorm(doc=3066)
          0.056186747 = weight(abstract_txt:testing in 3066) [ClassicSimilarity], result of:
            0.056186747 = score(doc=3066,freq=1.0), product of:
              0.11506256 = queryWeight, product of:
                1.1738466 = boost
                6.250429 = idf(docFreq=232, maxDocs=44421)
                0.01568241 = queryNorm
              0.48831478 = fieldWeight in 3066, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                6.250429 = idf(docFreq=232, maxDocs=44421)
                0.078125 = fieldNorm(doc=3066)
          0.05023576 = weight(abstract_txt:retrieval in 3066) [ClassicSimilarity], result of:
            0.05023576 = score(doc=3066,freq=3.0), product of:
              0.10678742 = queryWeight, product of:
                1.958687 = boost
                3.4765 = idf(docFreq=3732, maxDocs=44421)
                0.01568241 = queryNorm
              0.4704277 = fieldWeight in 3066, product of:
                1.7320508 = tf(freq=3.0), with freq of:
                  3.0 = termFreq=3.0
                3.4765 = idf(docFreq=3732, maxDocs=44421)
                0.078125 = fieldNorm(doc=3066)
          0.13679881 = weight(abstract_txt:interactive in 3066) [ClassicSimilarity], result of:
            0.13679881 = score(doc=3066,freq=3.0), product of:
              0.1819153 = queryWeight, product of:
                2.0873437 = boost
                5.557282 = idf(docFreq=465, maxDocs=44421)
                0.01568241 = queryNorm
              0.7519918 = fieldWeight in 3066, product of:
                1.7320508 = tf(freq=3.0), with freq of:
                  3.0 = termFreq=3.0
                5.557282 = idf(docFreq=465, maxDocs=44421)
                0.078125 = fieldNorm(doc=3066)
          0.23672977 = weight(abstract_txt:okapi in 3066) [ClassicSimilarity], result of:
            0.23672977 = score(doc=3066,freq=1.0), product of:
              0.37817255 = queryWeight, product of:
                3.0095694 = boost
                8.0125885 = idf(docFreq=39, maxDocs=44421)
                0.01568241 = queryNorm
              0.6259835 = fieldWeight in 3066, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                8.0125885 = idf(docFreq=39, maxDocs=44421)
                0.078125 = fieldNorm(doc=3066)
          0.33368236 = weight(abstract_txt:laboratory in 3066) [ClassicSimilarity], result of:
            0.33368236 = score(doc=3066,freq=2.0), product of:
              0.43194723 = queryWeight, product of:
                3.9393115 = boost
                6.9919376 = idf(docFreq=110, maxDocs=44421)
                0.01568241 = queryNorm
              0.77250725 = fieldWeight in 3066, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                6.9919376 = idf(docFreq=110, maxDocs=44421)
                0.078125 = fieldNorm(doc=3066)
          0.620156 = weight(abstract_txt:trec in 3066) [ClassicSimilarity], result of:
            0.620156 = score(doc=3066,freq=5.0), product of:
              0.5295115 = queryWeight, product of:
                5.0363054 = boost
                6.704255 = idf(docFreq=147, maxDocs=44421)
                0.01568241 = queryNorm
              1.1711851 = fieldWeight in 3066, product of:
                2.236068 = tf(freq=5.0), with freq of:
                  5.0 = termFreq=5.0
                6.704255 = idf(docFreq=147, maxDocs=44421)
                0.078125 = fieldNorm(doc=3066)
        0.28 = coord(7/25)
    
  2. Vakkari, P.; Sormunen, E.: ¬The influence of relevance levels an the effectiveness of interactive information retrieval (2004) 0.24
    0.23993887 = sum of:
      0.23993887 = product of:
        0.74980897 = sum of:
          0.049126387 = weight(abstract_txt:experiments in 3884) [ClassicSimilarity], result of:
            0.049126387 = score(doc=3884,freq=2.0), product of:
              0.08350477 = queryWeight, product of:
                5.324741 = idf(docFreq=587, maxDocs=44421)
                0.01568241 = queryNorm
              0.5883063 = fieldWeight in 3884, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                5.324741 = idf(docFreq=587, maxDocs=44421)
                0.078125 = fieldNorm(doc=3884)
          0.03962826 = weight(abstract_txt:conference in 3884) [ClassicSimilarity], result of:
            0.03962826 = score(doc=3884,freq=1.0), product of:
              0.09116919 = queryWeight, product of:
                1.0448848 = boost
                5.5637407 = idf(docFreq=462, maxDocs=44421)
                0.01568241 = queryNorm
              0.43466723 = fieldWeight in 3884, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.5637407 = idf(docFreq=462, maxDocs=44421)
                0.078125 = fieldNorm(doc=3884)
          0.010735748 = weight(abstract_txt:with in 3884) [ClassicSimilarity], result of:
            0.010735748 = score(doc=3884,freq=1.0), product of:
              0.05505204 = queryWeight, product of:
                1.4063444 = boost
                2.4961398 = idf(docFreq=9949, maxDocs=44421)
                0.01568241 = queryNorm
              0.19501092 = fieldWeight in 3884, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                2.4961398 = idf(docFreq=9949, maxDocs=44421)
                0.078125 = fieldNorm(doc=3884)
          0.046257753 = weight(abstract_txt:collection in 3884) [ClassicSimilarity], result of:
            0.046257753 = score(doc=3884,freq=1.0), product of:
              0.12734379 = queryWeight, product of:
                1.7464181 = boost
                4.649612 = idf(docFreq=1154, maxDocs=44421)
                0.01568241 = queryNorm
              0.36325094 = fieldWeight in 3884, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                4.649612 = idf(docFreq=1154, maxDocs=44421)
                0.078125 = fieldNorm(doc=3884)
          0.059126634 = weight(abstract_txt:test in 3884) [ClassicSimilarity], result of:
            0.059126634 = score(doc=3884,freq=1.0), product of:
              0.14998351 = queryWeight, product of:
                1.8953137 = boost
                5.046027 = idf(docFreq=776, maxDocs=44421)
                0.01568241 = queryNorm
              0.3942209 = fieldWeight in 3884, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.046027 = idf(docFreq=776, maxDocs=44421)
                0.078125 = fieldNorm(doc=3884)
          0.041017327 = weight(abstract_txt:retrieval in 3884) [ClassicSimilarity], result of:
            0.041017327 = score(doc=3884,freq=2.0), product of:
              0.10678742 = queryWeight, product of:
                1.958687 = boost
                3.4765 = idf(docFreq=3732, maxDocs=44421)
                0.01568241 = queryNorm
              0.3841026 = fieldWeight in 3884, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                3.4765 = idf(docFreq=3732, maxDocs=44421)
                0.078125 = fieldNorm(doc=3884)
          0.11169576 = weight(abstract_txt:interactive in 3884) [ClassicSimilarity], result of:
            0.11169576 = score(doc=3884,freq=2.0), product of:
              0.1819153 = queryWeight, product of:
                2.0873437 = boost
                5.557282 = idf(docFreq=465, maxDocs=44421)
                0.01568241 = queryNorm
              0.6139987 = fieldWeight in 3884, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                5.557282 = idf(docFreq=465, maxDocs=44421)
                0.078125 = fieldNorm(doc=3884)
          0.3922211 = weight(abstract_txt:trec in 3884) [ClassicSimilarity], result of:
            0.3922211 = score(doc=3884,freq=2.0), product of:
              0.5295115 = queryWeight, product of:
                5.0363054 = boost
                6.704255 = idf(docFreq=147, maxDocs=44421)
                0.01568241 = queryNorm
              0.7407225 = fieldWeight in 3884, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                6.704255 = idf(docFreq=147, maxDocs=44421)
                0.078125 = fieldNorm(doc=3884)
        0.32 = coord(8/25)
    
  3. TREC: experiment and evaluation in information retrieval (2005) 0.21
    0.21440043 = sum of:
      0.21440043 = product of:
        0.8933351 = sum of:
          0.031702608 = weight(abstract_txt:conference in 761) [ClassicSimilarity], result of:
            0.031702608 = score(doc=761,freq=1.0), product of:
              0.09116919 = queryWeight, product of:
                1.0448848 = boost
                5.5637407 = idf(docFreq=462, maxDocs=44421)
                0.01568241 = queryNorm
              0.3477338 = fieldWeight in 761, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.5637407 = idf(docFreq=462, maxDocs=44421)
                0.0625 = fieldNorm(doc=761)
          0.008588599 = weight(abstract_txt:with in 761) [ClassicSimilarity], result of:
            0.008588599 = score(doc=761,freq=1.0), product of:
              0.05505204 = queryWeight, product of:
                1.4063444 = boost
                2.4961398 = idf(docFreq=9949, maxDocs=44421)
                0.01568241 = queryNorm
              0.15600874 = fieldWeight in 761, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                2.4961398 = idf(docFreq=9949, maxDocs=44421)
                0.0625 = fieldNorm(doc=761)
          0.08192826 = weight(abstract_txt:test in 761) [ClassicSimilarity], result of:
            0.08192826 = score(doc=761,freq=3.0), product of:
              0.14998351 = queryWeight, product of:
                1.8953137 = boost
                5.046027 = idf(docFreq=776, maxDocs=44421)
                0.01568241 = queryNorm
              0.54624844 = fieldWeight in 761, product of:
                1.7320508 = tf(freq=3.0), with freq of:
                  3.0 = termFreq=3.0
                5.046027 = idf(docFreq=776, maxDocs=44421)
                0.0625 = fieldNorm(doc=761)
          0.08037721 = weight(abstract_txt:retrieval in 761) [ClassicSimilarity], result of:
            0.08037721 = score(doc=761,freq=12.0), product of:
              0.10678742 = queryWeight, product of:
                1.958687 = boost
                3.4765 = idf(docFreq=3732, maxDocs=44421)
                0.01568241 = queryNorm
              0.7526843 = fieldWeight in 761, product of:
                3.4641016 = tf(freq=12.0), with freq of:
                  12.0 = termFreq=12.0
                3.4765 = idf(docFreq=3732, maxDocs=44421)
                0.0625 = fieldNorm(doc=761)
          0.06318466 = weight(abstract_txt:interactive in 761) [ClassicSimilarity], result of:
            0.06318466 = score(doc=761,freq=1.0), product of:
              0.1819153 = queryWeight, product of:
                2.0873437 = boost
                5.557282 = idf(docFreq=465, maxDocs=44421)
                0.01568241 = queryNorm
              0.34733012 = fieldWeight in 761, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.557282 = idf(docFreq=465, maxDocs=44421)
                0.0625 = fieldNorm(doc=761)
          0.62755376 = weight(abstract_txt:trec in 761) [ClassicSimilarity], result of:
            0.62755376 = score(doc=761,freq=8.0), product of:
              0.5295115 = queryWeight, product of:
                5.0363054 = boost
                6.704255 = idf(docFreq=147, maxDocs=44421)
                0.01568241 = queryNorm
              1.185156 = fieldWeight in 761, product of:
                2.828427 = tf(freq=8.0), with freq of:
                  8.0 = termFreq=8.0
                6.704255 = idf(docFreq=147, maxDocs=44421)
                0.0625 = fieldNorm(doc=761)
        0.24 = coord(6/25)
    
  4. Robertson, S.E.: OKAPI at TREC-3 (1995) 0.21
    0.20924072 = sum of:
      0.20924072 = product of:
        1.0462036 = sum of:
          0.04168512 = weight(abstract_txt:experiments in 6694) [ClassicSimilarity], result of:
            0.04168512 = score(doc=6694,freq=1.0), product of:
              0.08350477 = queryWeight, product of:
                5.324741 = idf(docFreq=587, maxDocs=44421)
                0.01568241 = queryNorm
              0.49919444 = fieldWeight in 6694, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.324741 = idf(docFreq=587, maxDocs=44421)
                0.09375 = fieldNorm(doc=6694)
          0.049220793 = weight(abstract_txt:retrieval in 6694) [ClassicSimilarity], result of:
            0.049220793 = score(doc=6694,freq=2.0), product of:
              0.10678742 = queryWeight, product of:
                1.958687 = boost
                3.4765 = idf(docFreq=3732, maxDocs=44421)
                0.01568241 = queryNorm
              0.46092314 = fieldWeight in 6694, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                3.4765 = idf(docFreq=3732, maxDocs=44421)
                0.09375 = fieldNorm(doc=6694)
          0.094776995 = weight(abstract_txt:interactive in 6694) [ClassicSimilarity], result of:
            0.094776995 = score(doc=6694,freq=1.0), product of:
              0.1819153 = queryWeight, product of:
                2.0873437 = boost
                5.557282 = idf(docFreq=465, maxDocs=44421)
                0.01568241 = queryNorm
              0.5209952 = fieldWeight in 6694, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.557282 = idf(docFreq=465, maxDocs=44421)
                0.09375 = fieldNorm(doc=6694)
          0.2840757 = weight(abstract_txt:okapi in 6694) [ClassicSimilarity], result of:
            0.2840757 = score(doc=6694,freq=1.0), product of:
              0.37817255 = queryWeight, product of:
                3.0095694 = boost
                8.0125885 = idf(docFreq=39, maxDocs=44421)
                0.01568241 = queryNorm
              0.7511802 = fieldWeight in 6694, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                8.0125885 = idf(docFreq=39, maxDocs=44421)
                0.09375 = fieldNorm(doc=6694)
          0.5764449 = weight(abstract_txt:trec in 6694) [ClassicSimilarity], result of:
            0.5764449 = score(doc=6694,freq=3.0), product of:
              0.5295115 = queryWeight, product of:
                5.0363054 = boost
                6.704255 = idf(docFreq=147, maxDocs=44421)
                0.01568241 = queryNorm
              1.0886353 = fieldWeight in 6694, product of:
                1.7320508 = tf(freq=3.0), with freq of:
                  3.0 = termFreq=3.0
                6.704255 = idf(docFreq=147, maxDocs=44421)
                0.09375 = fieldNorm(doc=6694)
        0.2 = coord(5/25)
    
  5. Robertson, S.E.: OKAPI at TREC-1 (1994) 0.20
    0.19989549 = sum of:
      0.19989549 = product of:
        1.2493469 = sum of:
          0.05558016 = weight(abstract_txt:experiments in 7952) [ClassicSimilarity], result of:
            0.05558016 = score(doc=7952,freq=1.0), product of:
              0.08350477 = queryWeight, product of:
                5.324741 = idf(docFreq=587, maxDocs=44421)
                0.01568241 = queryNorm
              0.6655926 = fieldWeight in 7952, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.324741 = idf(docFreq=587, maxDocs=44421)
                0.125 = fieldNorm(doc=7952)
          0.04640581 = weight(abstract_txt:retrieval in 7952) [ClassicSimilarity], result of:
            0.04640581 = score(doc=7952,freq=1.0), product of:
              0.10678742 = queryWeight, product of:
                1.958687 = boost
                3.4765 = idf(docFreq=3732, maxDocs=44421)
                0.01568241 = queryNorm
              0.4345625 = fieldWeight in 7952, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                3.4765 = idf(docFreq=3732, maxDocs=44421)
                0.125 = fieldNorm(doc=7952)
          0.37876764 = weight(abstract_txt:okapi in 7952) [ClassicSimilarity], result of:
            0.37876764 = score(doc=7952,freq=1.0), product of:
              0.37817255 = queryWeight, product of:
                3.0095694 = boost
                8.0125885 = idf(docFreq=39, maxDocs=44421)
                0.01568241 = queryNorm
              1.0015736 = fieldWeight in 7952, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                8.0125885 = idf(docFreq=39, maxDocs=44421)
                0.125 = fieldNorm(doc=7952)
          0.76859325 = weight(abstract_txt:trec in 7952) [ClassicSimilarity], result of:
            0.76859325 = score(doc=7952,freq=3.0), product of:
              0.5295115 = queryWeight, product of:
                5.0363054 = boost
                6.704255 = idf(docFreq=147, maxDocs=44421)
                0.01568241 = queryNorm
              1.4515138 = fieldWeight in 7952, product of:
                1.7320508 = tf(freq=3.0), with freq of:
                  3.0 = termFreq=3.0
                6.704255 = idf(docFreq=147, maxDocs=44421)
                0.125 = fieldNorm(doc=7952)
        0.16 = coord(4/25)