Document (#7952)

Author
Robertson, S.E.
Title
OKAPI at TREC
Imprint
London : British Library
Year
1994
Pages
19 S
Series
BLRD report; 6134
Abstract
Paper presented at the Text Retrieval Conference (TREC), Washington, DC, Nov 1992. Describes the OKAPI experimental text information retrieval system in terms of its design principles: the use of simple, robust and easy to use techniques which use best match searching and avoid Boolean logic
Object
OKAPI

Similar documents (author)

  1. Robertson, M.A.: Windows 3.0 for the online searcher (1991) 4.57
    4.574651 = sum of:
      4.574651 = weight(author_txt:robertson in 591) [ClassicSimilarity], result of:
        4.574651 = fieldWeight in 591, product of:
          1.0 = tf(freq=1.0), with freq of:
            1.0 = termFreq=1.0
          7.319441 = idf(docFreq=79, maxDocs=44421)
          0.625 = fieldNorm(doc=591)
    
  2. Robertson, S.E.: Some recent theories and models in information retrieval (1980) 4.57
    4.574651 = sum of:
      4.574651 = weight(author_txt:robertson in 1325) [ClassicSimilarity], result of:
        4.574651 = fieldWeight in 1325, product of:
          1.0 = tf(freq=1.0), with freq of:
            1.0 = termFreq=1.0
          7.319441 = idf(docFreq=79, maxDocs=44421)
          0.625 = fieldNorm(doc=1325)
    
  3. Robertson, S.E.: Theories and models in information retrieval (1977) 4.57
    4.574651 = sum of:
      4.574651 = weight(author_txt:robertson in 1843) [ClassicSimilarity], result of:
        4.574651 = fieldWeight in 1843, product of:
          1.0 = tf(freq=1.0), with freq of:
            1.0 = termFreq=1.0
          7.319441 = idf(docFreq=79, maxDocs=44421)
          0.625 = fieldNorm(doc=1843)
    
  4. Robertson, S.E.: On term selection for query expansion (1990) 4.57
    4.574651 = sum of:
      4.574651 = weight(author_txt:robertson in 2649) [ClassicSimilarity], result of:
        4.574651 = fieldWeight in 2649, product of:
          1.0 = tf(freq=1.0), with freq of:
            1.0 = termFreq=1.0
          7.319441 = idf(docFreq=79, maxDocs=44421)
          0.625 = fieldNorm(doc=2649)
    
  5. Robertson, S.E.: On relevance weight estimation and query expansion (1986) 4.57
    4.574651 = sum of:
      4.574651 = weight(author_txt:robertson in 3874) [ClassicSimilarity], result of:
        4.574651 = fieldWeight in 3874, product of:
          1.0 = tf(freq=1.0), with freq of:
            1.0 = termFreq=1.0
          7.319441 = idf(docFreq=79, maxDocs=44421)
          0.625 = fieldNorm(doc=3874)
    

Similar documents (content)

  1. Robertson, S.E.: OKAPI at TREC-1 (1994) 0.41
    0.40762094 = sum of:
      0.40762094 = product of:
        1.4557891 = sum of:
          0.021986973 = weight(abstract_txt:system in 7952) [ClassicSimilarity], result of:
            0.021986973 = score(doc=7952,freq=1.0), product of:
              0.052151646 = queryWeight, product of:
                3.372775 = idf(docFreq=4140, maxDocs=44421)
                0.015462534 = queryNorm
              0.42159688 = fieldWeight in 7952, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                3.372775 = idf(docFreq=4140, maxDocs=44421)
                0.125 = fieldNorm(doc=7952)
          0.03214214 = weight(abstract_txt:describes in 7952) [ClassicSimilarity], result of:
            0.03214214 = score(doc=7952,freq=1.0), product of:
              0.067174986 = queryWeight, product of:
                1.1349318 = boost
                3.82787 = idf(docFreq=2626, maxDocs=44421)
                0.015462534 = queryNorm
              0.47848374 = fieldWeight in 7952, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                3.82787 = idf(docFreq=2626, maxDocs=44421)
                0.125 = fieldNorm(doc=7952)
          0.09008762 = weight(abstract_txt:experimental in 7952) [ClassicSimilarity], result of:
            0.09008762 = score(doc=7952,freq=1.0), product of:
              0.13353686 = queryWeight, product of:
                1.6001716 = boost
                5.397019 = idf(docFreq=546, maxDocs=44421)
                0.015462534 = queryNorm
              0.67462736 = fieldWeight in 7952, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.397019 = idf(docFreq=546, maxDocs=44421)
                0.125 = fieldNorm(doc=7952)
          0.048157066 = weight(abstract_txt:retrieval in 7952) [ClassicSimilarity], result of:
            0.048157066 = score(doc=7952,freq=1.0), product of:
              0.11081735 = queryWeight, product of:
                2.0615072 = boost
                3.4765 = idf(docFreq=3732, maxDocs=44421)
                0.015462534 = 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)
          0.07562437 = weight(abstract_txt:text in 7952) [ClassicSimilarity], result of:
            0.07562437 = score(doc=7952,freq=1.0), product of:
              0.14971854 = queryWeight, product of:
                2.3961763 = boost
                4.040882 = idf(docFreq=2122, maxDocs=44421)
                0.015462534 = queryNorm
              0.50511026 = fieldWeight in 7952, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                4.040882 = idf(docFreq=2122, maxDocs=44421)
                0.125 = fieldNorm(doc=7952)
          0.5981987 = weight(abstract_txt:trec in 7952) [ClassicSimilarity], result of:
            0.5981987 = score(doc=7952,freq=3.0), product of:
              0.4121206 = queryWeight, product of:
                3.9755127 = boost
                6.704255 = idf(docFreq=147, maxDocs=44421)
                0.015462534 = 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)
          0.5895923 = weight(abstract_txt:okapi in 7952) [ClassicSimilarity], result of:
            0.5895923 = score(doc=7952,freq=1.0), product of:
              0.58866596 = queryWeight, product of:
                4.7513328 = boost
                8.0125885 = idf(docFreq=39, maxDocs=44421)
                0.015462534 = 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)
        0.28 = coord(7/25)
    
  2. TREC: experiment and evaluation in information retrieval (2005) 0.32
    0.3232169 = sum of:
      0.3232169 = product of:
        0.89782465 = sum of:
          0.01607107 = weight(abstract_txt:describes in 761) [ClassicSimilarity], result of:
            0.01607107 = score(doc=761,freq=1.0), product of:
              0.067174986 = queryWeight, product of:
                1.1349318 = boost
                3.82787 = idf(docFreq=2626, maxDocs=44421)
                0.015462534 = queryNorm
              0.23924187 = fieldWeight in 761, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                3.82787 = idf(docFreq=2626, maxDocs=44421)
                0.0625 = fieldNorm(doc=761)
          0.0266733 = weight(abstract_txt:techniques in 761) [ClassicSimilarity], result of:
            0.0266733 = score(doc=761,freq=1.0), product of:
              0.094166316 = queryWeight, product of:
                1.3437355 = boost
                4.5321174 = idf(docFreq=1298, maxDocs=44421)
                0.015462534 = queryNorm
              0.28325734 = fieldWeight in 761, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                4.5321174 = idf(docFreq=1298, maxDocs=44421)
                0.0625 = fieldNorm(doc=761)
          0.036179963 = weight(abstract_txt:best in 761) [ClassicSimilarity], result of:
            0.036179963 = score(doc=761,freq=1.0), product of:
              0.115386896 = queryWeight, product of:
                1.4874563 = boost
                5.0168557 = idf(docFreq=799, maxDocs=44421)
                0.015462534 = queryNorm
              0.31355348 = fieldWeight in 761, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.0168557 = idf(docFreq=799, maxDocs=44421)
                0.0625 = fieldNorm(doc=761)
          0.04504381 = weight(abstract_txt:experimental in 761) [ClassicSimilarity], result of:
            0.04504381 = score(doc=761,freq=1.0), product of:
              0.13353686 = queryWeight, product of:
                1.6001716 = boost
                5.397019 = idf(docFreq=546, maxDocs=44421)
                0.015462534 = queryNorm
              0.33731368 = fieldWeight in 761, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.397019 = idf(docFreq=546, maxDocs=44421)
                0.0625 = fieldNorm(doc=761)
          0.0493485 = weight(abstract_txt:conference in 761) [ClassicSimilarity], result of:
            0.0493485 = score(doc=761,freq=1.0), product of:
              0.14191459 = queryWeight, product of:
                1.6496032 = boost
                5.5637407 = idf(docFreq=462, maxDocs=44421)
                0.015462534 = 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)
          0.077045925 = weight(abstract_txt:1992 in 761) [ClassicSimilarity], result of:
            0.077045925 = score(doc=761,freq=1.0), product of:
              0.1909901 = queryWeight, product of:
                1.9136893 = boost
                6.4544435 = idf(docFreq=189, maxDocs=44421)
                0.015462534 = queryNorm
              0.40340272 = fieldWeight in 761, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                6.4544435 = idf(docFreq=189, maxDocs=44421)
                0.0625 = fieldNorm(doc=761)
          0.08341048 = weight(abstract_txt:retrieval in 761) [ClassicSimilarity], result of:
            0.08341048 = score(doc=761,freq=12.0), product of:
              0.11081735 = queryWeight, product of:
                2.0615072 = boost
                3.4765 = idf(docFreq=3732, maxDocs=44421)
                0.015462534 = 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)
          0.07562437 = weight(abstract_txt:text in 761) [ClassicSimilarity], result of:
            0.07562437 = score(doc=761,freq=4.0), product of:
              0.14971854 = queryWeight, product of:
                2.3961763 = boost
                4.040882 = idf(docFreq=2122, maxDocs=44421)
                0.015462534 = queryNorm
              0.50511026 = fieldWeight in 761, product of:
                2.0 = tf(freq=4.0), with freq of:
                  4.0 = termFreq=4.0
                4.040882 = idf(docFreq=2122, maxDocs=44421)
                0.0625 = fieldNorm(doc=761)
          0.48842722 = weight(abstract_txt:trec in 761) [ClassicSimilarity], result of:
            0.48842722 = score(doc=761,freq=8.0), product of:
              0.4121206 = queryWeight, product of:
                3.9755127 = boost
                6.704255 = idf(docFreq=147, maxDocs=44421)
                0.015462534 = 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)
        0.36 = coord(9/25)
    
  3. Robertson, S.E.: OKAPI at TREC-3 (1995) 0.31
    0.31407392 = sum of:
      0.31407392 = product of:
        1.1216925 = sum of:
          0.016490228 = weight(abstract_txt:system in 6694) [ClassicSimilarity], result of:
            0.016490228 = score(doc=6694,freq=1.0), product of:
              0.052151646 = queryWeight, product of:
                3.372775 = idf(docFreq=4140, maxDocs=44421)
                0.015462534 = queryNorm
              0.31619766 = fieldWeight in 6694, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                3.372775 = idf(docFreq=4140, maxDocs=44421)
                0.09375 = fieldNorm(doc=6694)
          0.049222752 = weight(abstract_txt:terms in 6694) [ClassicSimilarity], result of:
            0.049222752 = score(doc=6694,freq=3.0), product of:
              0.07496417 = queryWeight, product of:
                1.1989273 = boost
                4.043712 = idf(docFreq=2116, maxDocs=44421)
                0.015462534 = queryNorm
              0.65661705 = fieldWeight in 6694, product of:
                1.7320508 = tf(freq=3.0), with freq of:
                  3.0 = termFreq=3.0
                4.043712 = idf(docFreq=2116, maxDocs=44421)
                0.09375 = fieldNorm(doc=6694)
          0.033846203 = weight(abstract_txt:searching in 6694) [ClassicSimilarity], result of:
            0.033846203 = score(doc=6694,freq=1.0), product of:
              0.084228076 = queryWeight, product of:
                1.2708504 = boost
                4.2862926 = idf(docFreq=1660, maxDocs=44421)
                0.015462534 = queryNorm
              0.4018399 = fieldWeight in 6694, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                4.2862926 = idf(docFreq=1660, maxDocs=44421)
                0.09375 = fieldNorm(doc=6694)
          0.051078282 = weight(abstract_txt:retrieval in 6694) [ClassicSimilarity], result of:
            0.051078282 = score(doc=6694,freq=2.0), product of:
              0.11081735 = queryWeight, product of:
                2.0615072 = boost
                3.4765 = idf(docFreq=3732, maxDocs=44421)
                0.015462534 = 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)
          0.08021176 = weight(abstract_txt:text in 6694) [ClassicSimilarity], result of:
            0.08021176 = score(doc=6694,freq=2.0), product of:
              0.14971854 = queryWeight, product of:
                2.3961763 = boost
                4.040882 = idf(docFreq=2122, maxDocs=44421)
                0.015462534 = queryNorm
              0.5357503 = fieldWeight in 6694, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                4.040882 = idf(docFreq=2122, maxDocs=44421)
                0.09375 = fieldNorm(doc=6694)
          0.44864905 = weight(abstract_txt:trec in 6694) [ClassicSimilarity], result of:
            0.44864905 = score(doc=6694,freq=3.0), product of:
              0.4121206 = queryWeight, product of:
                3.9755127 = boost
                6.704255 = idf(docFreq=147, maxDocs=44421)
                0.015462534 = 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)
          0.4421942 = weight(abstract_txt:okapi in 6694) [ClassicSimilarity], result of:
            0.4421942 = score(doc=6694,freq=1.0), product of:
              0.58866596 = queryWeight, product of:
                4.7513328 = boost
                8.0125885 = idf(docFreq=39, maxDocs=44421)
                0.015462534 = 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)
        0.28 = coord(7/25)
    
  4. Beaulieu, M.; Robertson, S.; Rasmussen, E.: Evaluating interactive systems in TREC (1996) 0.29
    0.29195416 = sum of:
      0.29195416 = product of:
        1.0426934 = sum of:
          0.021545554 = weight(abstract_txt:design in 3066) [ClassicSimilarity], result of:
            0.021545554 = score(doc=3066,freq=1.0), product of:
              0.07038436 = queryWeight, product of:
                1.161727 = boost
                3.9182436 = idf(docFreq=2399, maxDocs=44421)
                0.015462534 = queryNorm
              0.3061128 = fieldWeight in 3066, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                3.9182436 = idf(docFreq=2399, maxDocs=44421)
                0.078125 = fieldNorm(doc=3066)
          0.028205171 = weight(abstract_txt:searching in 3066) [ClassicSimilarity], result of:
            0.028205171 = score(doc=3066,freq=1.0), product of:
              0.084228076 = queryWeight, product of:
                1.2708504 = boost
                4.2862926 = idf(docFreq=1660, maxDocs=44421)
                0.015462534 = queryNorm
              0.3348666 = fieldWeight in 3066, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                4.2862926 = idf(docFreq=1660, maxDocs=44421)
                0.078125 = fieldNorm(doc=3066)
          0.033341624 = weight(abstract_txt:techniques in 3066) [ClassicSimilarity], result of:
            0.033341624 = score(doc=3066,freq=1.0), product of:
              0.094166316 = queryWeight, product of:
                1.3437355 = boost
                4.5321174 = idf(docFreq=1298, maxDocs=44421)
                0.015462534 = queryNorm
              0.35407168 = fieldWeight in 3066, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                4.5321174 = idf(docFreq=1298, maxDocs=44421)
                0.078125 = fieldNorm(doc=3066)
          0.05630476 = weight(abstract_txt:experimental in 3066) [ClassicSimilarity], result of:
            0.05630476 = score(doc=3066,freq=1.0), product of:
              0.13353686 = queryWeight, product of:
                1.6001716 = boost
                5.397019 = idf(docFreq=546, maxDocs=44421)
                0.015462534 = queryNorm
              0.4216421 = fieldWeight in 3066, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.397019 = idf(docFreq=546, maxDocs=44421)
                0.078125 = fieldNorm(doc=3066)
          0.052131552 = weight(abstract_txt:retrieval in 3066) [ClassicSimilarity], result of:
            0.052131552 = score(doc=3066,freq=3.0), product of:
              0.11081735 = queryWeight, product of:
                2.0615072 = boost
                3.4765 = idf(docFreq=3732, maxDocs=44421)
                0.015462534 = 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)
          0.48266953 = weight(abstract_txt:trec in 3066) [ClassicSimilarity], result of:
            0.48266953 = score(doc=3066,freq=5.0), product of:
              0.4121206 = queryWeight, product of:
                3.9755127 = boost
                6.704255 = idf(docFreq=147, maxDocs=44421)
                0.015462534 = 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)
          0.36849517 = weight(abstract_txt:okapi in 3066) [ClassicSimilarity], result of:
            0.36849517 = score(doc=3066,freq=1.0), product of:
              0.58866596 = queryWeight, product of:
                4.7513328 = boost
                8.0125885 = idf(docFreq=39, maxDocs=44421)
                0.015462534 = 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)
        0.28 = coord(7/25)
    
  5. Fieldhouse, M.; Hancock-Beaulieu, M.: ¬The changing face of OKAPI (1994) 0.26
    0.26305556 = sum of:
      0.26305556 = product of:
        0.82204866 = sum of:
          0.013741858 = weight(abstract_txt:system in 1561) [ClassicSimilarity], result of:
            0.013741858 = score(doc=1561,freq=1.0), product of:
              0.052151646 = queryWeight, product of:
                3.372775 = idf(docFreq=4140, maxDocs=44421)
                0.015462534 = queryNorm
              0.26349807 = fieldWeight in 1561, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                3.372775 = idf(docFreq=4140, maxDocs=44421)
                0.078125 = fieldNorm(doc=1561)
          0.020088837 = weight(abstract_txt:describes in 1561) [ClassicSimilarity], result of:
            0.020088837 = score(doc=1561,freq=1.0), product of:
              0.067174986 = queryWeight, product of:
                1.1349318 = boost
                3.82787 = idf(docFreq=2626, maxDocs=44421)
                0.015462534 = queryNorm
              0.29905233 = fieldWeight in 1561, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                3.82787 = idf(docFreq=2626, maxDocs=44421)
                0.078125 = fieldNorm(doc=1561)
          0.030470012 = weight(abstract_txt:design in 1561) [ClassicSimilarity], result of:
            0.030470012 = score(doc=1561,freq=2.0), product of:
              0.07038436 = queryWeight, product of:
                1.161727 = boost
                3.9182436 = idf(docFreq=2399, maxDocs=44421)
                0.015462534 = queryNorm
              0.43290883 = fieldWeight in 1561, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                3.9182436 = idf(docFreq=2399, maxDocs=44421)
                0.078125 = fieldNorm(doc=1561)
          0.045224953 = weight(abstract_txt:best in 1561) [ClassicSimilarity], result of:
            0.045224953 = score(doc=1561,freq=1.0), product of:
              0.115386896 = queryWeight, product of:
                1.4874563 = boost
                5.0168557 = idf(docFreq=799, maxDocs=44421)
                0.015462534 = queryNorm
              0.39194185 = fieldWeight in 1561, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.0168557 = idf(docFreq=799, maxDocs=44421)
                0.078125 = fieldNorm(doc=1561)
          0.05630476 = weight(abstract_txt:experimental in 1561) [ClassicSimilarity], result of:
            0.05630476 = score(doc=1561,freq=1.0), product of:
              0.13353686 = queryWeight, product of:
                1.6001716 = boost
                5.397019 = idf(docFreq=546, maxDocs=44421)
                0.015462534 = queryNorm
              0.4216421 = fieldWeight in 1561, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.397019 = idf(docFreq=546, maxDocs=44421)
                0.078125 = fieldNorm(doc=1561)
          0.09252213 = weight(abstract_txt:match in 1561) [ClassicSimilarity], result of:
            0.09252213 = score(doc=1561,freq=1.0), product of:
              0.18595228 = queryWeight, product of:
                1.8882815 = boost
                6.3687487 = idf(docFreq=206, maxDocs=44421)
                0.015462534 = queryNorm
              0.49755847 = fieldWeight in 1561, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                6.3687487 = idf(docFreq=206, maxDocs=44421)
                0.078125 = fieldNorm(doc=1561)
          0.042565234 = weight(abstract_txt:retrieval in 1561) [ClassicSimilarity], result of:
            0.042565234 = score(doc=1561,freq=2.0), product of:
              0.11081735 = queryWeight, product of:
                2.0615072 = boost
                3.4765 = idf(docFreq=3732, maxDocs=44421)
                0.015462534 = queryNorm
              0.3841026 = fieldWeight in 1561, 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=1561)
          0.52113086 = weight(abstract_txt:okapi in 1561) [ClassicSimilarity], result of:
            0.52113086 = score(doc=1561,freq=2.0), product of:
              0.58866596 = queryWeight, product of:
                4.7513328 = boost
                8.0125885 = idf(docFreq=39, maxDocs=44421)
                0.015462534 = queryNorm
              0.88527435 = fieldWeight in 1561, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                8.0125885 = idf(docFreq=39, maxDocs=44421)
                0.078125 = fieldNorm(doc=1561)
        0.32 = coord(8/25)