Document (#23332)

Author

Aigrain, P.
Longueville, V.

Title

¬A model for the evaluation of expansion techniques in information retrieval systems

Source

Journal of the American Society for Information Science. 45(1994) no.4, S.225-234

Year

1994

Abstract

We describe an evaluation model for expansion systems in information retrieval, that is, systems expanding a user selection of documents in order to provide the user with a larger set of documents sharing the same or related chracteristics. Our model leads to a test protocal and practical estimates of the efficieny of an expansion system provided that it is possible for a sample of users to exhaustively scan the content of a subset of the database in order to decide which documents would have been selected by an 'ideal' expansion system. This condition is met only by databases whose unit contents can be quickly apprehended, such as still image databases or synthetic bibliographical references. We compare our model with other types of possible indicators, and discuss the precision to which our measure can be estimated, using data from experimentation with an image database system developed by our research team

Theme

Retrievalalgorithmen

Similar documents (content)

1. Efthimiadis, E.N.: Interactive query expansion : a user-based evaluation in a relevance feedback environment (2000) 0.31

   0.30677104 = sum of:
     0.30677104 = product of:
       0.85214174 = sum of:
         0.027320035 = weight(abstract_txt:retrieval in 5701) [ClassicSimilarity], result of:
           0.027320035 = score(doc=5701,freq=3.0), product of:
             0.08299661 = queryWeight, product of:
               3.4751394 = idf(docFreq=3720, maxDocs=44218)
               0.023882957 = queryNorm
             0.3291705 = fieldWeight in 5701, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               3.4751394 = idf(docFreq=3720, maxDocs=44218)
               0.0546875 = fieldNorm(doc=5701)
         0.026565412 = weight(abstract_txt:user in 5701) [ClassicSimilarity], result of:
           0.026565412 = score(doc=5701,freq=2.0), product of:
             0.09324974 = queryWeight, product of:
               1.0599701 = boost
               3.6835442 = idf(docFreq=3020, maxDocs=44218)
               0.023882957 = queryNorm
             0.28488457 = fieldWeight in 5701, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               3.6835442 = idf(docFreq=3020, maxDocs=44218)
               0.0546875 = fieldNorm(doc=5701)
         0.008805951 = weight(abstract_txt:with in 5701) [ClassicSimilarity], result of:
           0.008805951 = score(doc=5701,freq=1.0), product of:
             0.06441611 = queryWeight, product of:
               1.0789783 = boost
               2.4997334 = idf(docFreq=9868, maxDocs=44218)
               0.023882957 = queryNorm
             0.13670418 = fieldWeight in 5701, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               2.4997334 = idf(docFreq=9868, maxDocs=44218)
               0.0546875 = fieldNorm(doc=5701)
         0.029465048 = weight(abstract_txt:database in 5701) [ClassicSimilarity], result of:
           0.029465048 = score(doc=5701,freq=1.0), product of:
             0.1258881 = queryWeight, product of:
               1.2315787 = boost
               4.2799077 = idf(docFreq=1663, maxDocs=44218)
               0.023882957 = queryNorm
             0.23405746 = fieldWeight in 5701, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.2799077 = idf(docFreq=1663, maxDocs=44218)
               0.0546875 = fieldNorm(doc=5701)
         0.033931393 = weight(abstract_txt:evaluation in 5701) [ClassicSimilarity], result of:
           0.033931393 = score(doc=5701,freq=1.0), product of:
             0.13830812 = queryWeight, product of:
               1.2909032 = boost
               4.4860687 = idf(docFreq=1353, maxDocs=44218)
               0.023882957 = queryNorm
             0.24533188 = fieldWeight in 5701, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.4860687 = idf(docFreq=1353, maxDocs=44218)
               0.0546875 = fieldNorm(doc=5701)
         0.021621065 = weight(abstract_txt:system in 5701) [ClassicSimilarity], result of:
           0.021621065 = score(doc=5701,freq=1.0), product of:
             0.1172362 = queryWeight, product of:
               1.4556143 = boost
               3.3723085 = idf(docFreq=4123, maxDocs=44218)
               0.023882957 = queryNorm
             0.18442312 = fieldWeight in 5701, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.3723085 = idf(docFreq=4123, maxDocs=44218)
               0.0546875 = fieldNorm(doc=5701)
         0.031665824 = weight(abstract_txt:systems in 5701) [ClassicSimilarity], result of:
           0.031665824 = score(doc=5701,freq=2.0), product of:
             0.12000358 = queryWeight, product of:
               1.4726942 = boost
               3.4118783 = idf(docFreq=3963, maxDocs=44218)
               0.023882957 = queryNorm
             0.263874 = fieldWeight in 5701, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               3.4118783 = idf(docFreq=3963, maxDocs=44218)
               0.0546875 = fieldNorm(doc=5701)
         0.055810213 = weight(abstract_txt:documents in 5701) [ClassicSimilarity], result of:
           0.055810213 = score(doc=5701,freq=2.0), product of:
             0.17509596 = queryWeight, product of:
               1.7789081 = boost
               4.1213026 = idf(docFreq=1949, maxDocs=44218)
               0.023882957 = queryNorm
             0.31874073 = fieldWeight in 5701, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               4.1213026 = idf(docFreq=1949, maxDocs=44218)
               0.0546875 = fieldNorm(doc=5701)
         0.6169568 = weight(abstract_txt:expansion in 5701) [ClassicSimilarity], result of:
           0.6169568 = score(doc=5701,freq=13.0), product of:
             0.51244265 = queryWeight, product of:
               3.5140462 = boost
               6.1059003 = idf(docFreq=267, maxDocs=44218)
               0.023882957 = queryNorm
             1.2039528 = fieldWeight in 5701, product of:
               3.6055512 = tf(freq=13.0), with freq of:
                 13.0 = termFreq=13.0
               6.1059003 = idf(docFreq=267, maxDocs=44218)
               0.0546875 = fieldNorm(doc=5701)
       0.36 = coord(9/25)
   

2. Hoque, E.; Hoeber, O.; Gong, M.: CIDER: Concept-based image diversification, exploration, and retrieval (2013) 0.21

   0.21149406 = sum of:
     0.21149406 = product of:
       0.58748347 = sum of:
         0.0360531 = weight(abstract_txt:retrieval in 2716) [ClassicSimilarity], result of:
           0.0360531 = score(doc=2716,freq=4.0), product of:
             0.08299661 = queryWeight, product of:
               3.4751394 = idf(docFreq=3720, maxDocs=44218)
               0.023882957 = queryNorm
             0.43439242 = fieldWeight in 2716, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               3.4751394 = idf(docFreq=3720, maxDocs=44218)
               0.0625 = fieldNorm(doc=2716)
         0.021468095 = weight(abstract_txt:user in 2716) [ClassicSimilarity], result of:
           0.021468095 = score(doc=2716,freq=1.0), product of:
             0.09324974 = queryWeight, product of:
               1.0599701 = boost
               3.6835442 = idf(docFreq=3020, maxDocs=44218)
               0.023882957 = queryNorm
             0.23022151 = fieldWeight in 2716, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.6835442 = idf(docFreq=3020, maxDocs=44218)
               0.0625 = fieldNorm(doc=2716)
         0.014232567 = weight(abstract_txt:with in 2716) [ClassicSimilarity], result of:
           0.014232567 = score(doc=2716,freq=2.0), product of:
             0.06441611 = queryWeight, product of:
               1.0789783 = boost
               2.4997334 = idf(docFreq=9868, maxDocs=44218)
               0.023882957 = queryNorm
             0.22094731 = fieldWeight in 2716, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               2.4997334 = idf(docFreq=9868, maxDocs=44218)
               0.0625 = fieldNorm(doc=2716)
         0.037773404 = weight(abstract_txt:order in 2716) [ClassicSimilarity], result of:
           0.037773404 = score(doc=2716,freq=1.0), product of:
             0.13590728 = queryWeight, product of:
               1.27965 = boost
               4.446962 = idf(docFreq=1407, maxDocs=44218)
               0.023882957 = queryNorm
             0.27793512 = fieldWeight in 2716, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.446962 = idf(docFreq=1407, maxDocs=44218)
               0.0625 = fieldNorm(doc=2716)
         0.038778733 = weight(abstract_txt:evaluation in 2716) [ClassicSimilarity], result of:
           0.038778733 = score(doc=2716,freq=1.0), product of:
             0.13830812 = queryWeight, product of:
               1.2909032 = boost
               4.4860687 = idf(docFreq=1353, maxDocs=44218)
               0.023882957 = queryNorm
             0.2803793 = fieldWeight in 2716, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.4860687 = idf(docFreq=1353, maxDocs=44218)
               0.0625 = fieldNorm(doc=2716)
         0.04250299 = weight(abstract_txt:possible in 2716) [ClassicSimilarity], result of:
           0.04250299 = score(doc=2716,freq=1.0), product of:
             0.1470274 = queryWeight, product of:
               1.3309722 = boost
               4.6253138 = idf(docFreq=1177, maxDocs=44218)
               0.023882957 = queryNorm
             0.2890821 = fieldWeight in 2716, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.6253138 = idf(docFreq=1177, maxDocs=44218)
               0.0625 = fieldNorm(doc=2716)
         0.02470979 = weight(abstract_txt:system in 2716) [ClassicSimilarity], result of:
           0.02470979 = score(doc=2716,freq=1.0), product of:
             0.1172362 = queryWeight, product of:
               1.4556143 = boost
               3.3723085 = idf(docFreq=4123, maxDocs=44218)
               0.023882957 = queryNorm
             0.21076928 = fieldWeight in 2716, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.3723085 = idf(docFreq=4123, maxDocs=44218)
               0.0625 = fieldNorm(doc=2716)
         0.17640707 = weight(abstract_txt:image in 2716) [ClassicSimilarity], result of:
           0.17640707 = score(doc=2716,freq=7.0), product of:
             0.19850126 = queryWeight, product of:
               1.5465055 = boost
               5.374322 = idf(docFreq=556, maxDocs=44218)
               0.023882957 = queryNorm
             0.88869494 = fieldWeight in 2716, product of:
               2.6457512 = tf(freq=7.0), with freq of:
                 7.0 = termFreq=7.0
               5.374322 = idf(docFreq=556, maxDocs=44218)
               0.0625 = fieldNorm(doc=2716)
         0.19555773 = weight(abstract_txt:expansion in 2716) [ClassicSimilarity], result of:
           0.19555773 = score(doc=2716,freq=1.0), product of:
             0.51244265 = queryWeight, product of:
               3.5140462 = boost
               6.1059003 = idf(docFreq=267, maxDocs=44218)
               0.023882957 = queryNorm
             0.38161877 = fieldWeight in 2716, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.1059003 = idf(docFreq=267, maxDocs=44218)
               0.0625 = fieldNorm(doc=2716)
       0.36 = coord(9/25)
   

3. Beaulieu, M.; Jones, S.: Interactive searching and interface issues in the Okapi best match probabilistic retrieval system (1998) 0.21

   0.20789593 = sum of:
     0.20789593 = product of:
       0.64967483 = sum of:
         0.046834346 = weight(abstract_txt:retrieval in 430) [ClassicSimilarity], result of:
           0.046834346 = score(doc=430,freq=3.0), product of:
             0.08299661 = queryWeight, product of:
               3.4751394 = idf(docFreq=3720, maxDocs=44218)
               0.023882957 = queryNorm
             0.5642923 = fieldWeight in 430, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               3.4751394 = idf(docFreq=3720, maxDocs=44218)
               0.09375 = fieldNorm(doc=430)
         0.04554071 = weight(abstract_txt:user in 430) [ClassicSimilarity], result of:
           0.04554071 = score(doc=430,freq=2.0), product of:
             0.09324974 = queryWeight, product of:
               1.0599701 = boost
               3.6835442 = idf(docFreq=3020, maxDocs=44218)
               0.023882957 = queryNorm
             0.48837358 = fieldWeight in 430, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               3.6835442 = idf(docFreq=3020, maxDocs=44218)
               0.09375 = fieldNorm(doc=430)
         0.015095917 = weight(abstract_txt:with in 430) [ClassicSimilarity], result of:
           0.015095917 = score(doc=430,freq=1.0), product of:
             0.06441611 = queryWeight, product of:
               1.0789783 = boost
               2.4997334 = idf(docFreq=9868, maxDocs=44218)
               0.023882957 = queryNorm
             0.23435001 = fieldWeight in 430, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               2.4997334 = idf(docFreq=9868, maxDocs=44218)
               0.09375 = fieldNorm(doc=430)
         0.056660105 = weight(abstract_txt:order in 430) [ClassicSimilarity], result of:
           0.056660105 = score(doc=430,freq=1.0), product of:
             0.13590728 = queryWeight, product of:
               1.27965 = boost
               4.446962 = idf(docFreq=1407, maxDocs=44218)
               0.023882957 = queryNorm
             0.41690266 = fieldWeight in 430, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.446962 = idf(docFreq=1407, maxDocs=44218)
               0.09375 = fieldNorm(doc=430)
         0.058168102 = weight(abstract_txt:evaluation in 430) [ClassicSimilarity], result of:
           0.058168102 = score(doc=430,freq=1.0), product of:
             0.13830812 = queryWeight, product of:
               1.2909032 = boost
               4.4860687 = idf(docFreq=1353, maxDocs=44218)
               0.023882957 = queryNorm
             0.42056894 = fieldWeight in 430, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.4860687 = idf(docFreq=1353, maxDocs=44218)
               0.09375 = fieldNorm(doc=430)
         0.05241738 = weight(abstract_txt:system in 430) [ClassicSimilarity], result of:
           0.05241738 = score(doc=430,freq=2.0), product of:
             0.1172362 = queryWeight, product of:
               1.4556143 = boost
               3.3723085 = idf(docFreq=4123, maxDocs=44218)
               0.023882957 = queryNorm
             0.44710916 = fieldWeight in 430, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               3.3723085 = idf(docFreq=4123, maxDocs=44218)
               0.09375 = fieldNorm(doc=430)
         0.081621684 = weight(abstract_txt:model in 430) [ClassicSimilarity], result of:
           0.081621684 = score(doc=430,freq=1.0), product of:
             0.21840948 = queryWeight, product of:
               2.2941434 = boost
               3.986234 = idf(docFreq=2231, maxDocs=44218)
               0.023882957 = queryNorm
             0.37370944 = fieldWeight in 430, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.986234 = idf(docFreq=2231, maxDocs=44218)
               0.09375 = fieldNorm(doc=430)
         0.2933366 = weight(abstract_txt:expansion in 430) [ClassicSimilarity], result of:
           0.2933366 = score(doc=430,freq=1.0), product of:
             0.51244265 = queryWeight, product of:
               3.5140462 = boost
               6.1059003 = idf(docFreq=267, maxDocs=44218)
               0.023882957 = queryNorm
             0.57242817 = fieldWeight in 430, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.1059003 = idf(docFreq=267, maxDocs=44218)
               0.09375 = fieldNorm(doc=430)
       0.32 = coord(8/25)
   

4. Wu, H.C.; Luk, R.W.P.; Wong, K.F,; Kwok, K.L.: ¬A retrospective study of a hybrid document-context based retrieval model (2007) 0.21

   0.20712733 = sum of:
     0.20712733 = product of:
       0.64727294 = sum of:
         0.027320035 = weight(abstract_txt:retrieval in 936) [ClassicSimilarity], result of:
           0.027320035 = score(doc=936,freq=3.0), product of:
             0.08299661 = queryWeight, product of:
               3.4751394 = idf(docFreq=3720, maxDocs=44218)
               0.023882957 = queryNorm
             0.3291705 = fieldWeight in 936, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               3.4751394 = idf(docFreq=3720, maxDocs=44218)
               0.0546875 = fieldNorm(doc=936)
         0.018784584 = weight(abstract_txt:user in 936) [ClassicSimilarity], result of:
           0.018784584 = score(doc=936,freq=1.0), product of:
             0.09324974 = queryWeight, product of:
               1.0599701 = boost
               3.6835442 = idf(docFreq=3020, maxDocs=44218)
               0.023882957 = queryNorm
             0.20144382 = fieldWeight in 936, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.6835442 = idf(docFreq=3020, maxDocs=44218)
               0.0546875 = fieldNorm(doc=936)
         0.015252354 = weight(abstract_txt:with in 936) [ClassicSimilarity], result of:
           0.015252354 = score(doc=936,freq=3.0), product of:
             0.06441611 = queryWeight, product of:
               1.0789783 = boost
               2.4997334 = idf(docFreq=9868, maxDocs=44218)
               0.023882957 = queryNorm
             0.23677856 = fieldWeight in 936, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               2.4997334 = idf(docFreq=9868, maxDocs=44218)
               0.0546875 = fieldNorm(doc=936)
         0.11755543 = weight(abstract_txt:estimated in 936) [ClassicSimilarity], result of:
           0.11755543 = score(doc=936,freq=2.0), product of:
             0.19949028 = queryWeight, product of:
               1.0962654 = boost
               7.61935 = idf(docFreq=58, maxDocs=44218)
               0.023882957 = queryNorm
             0.589279 = fieldWeight in 936, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               7.61935 = idf(docFreq=58, maxDocs=44218)
               0.0546875 = fieldNorm(doc=936)
         0.08605631 = weight(abstract_txt:estimates in 936) [ClassicSimilarity], result of:
           0.08605631 = score(doc=936,freq=1.0), product of:
             0.20415424 = queryWeight, product of:
               1.1090064 = boost
               7.7079034 = idf(docFreq=53, maxDocs=44218)
               0.023882957 = queryNorm
             0.42152596 = fieldWeight in 936, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.7079034 = idf(docFreq=53, maxDocs=44218)
               0.0546875 = fieldNorm(doc=936)
         0.06835327 = weight(abstract_txt:documents in 936) [ClassicSimilarity], result of:
           0.06835327 = score(doc=936,freq=3.0), product of:
             0.17509596 = queryWeight, product of:
               1.7789081 = boost
               4.1213026 = idf(docFreq=1949, maxDocs=44218)
               0.023882957 = queryNorm
             0.39037606 = fieldWeight in 936, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               4.1213026 = idf(docFreq=1949, maxDocs=44218)
               0.0546875 = fieldNorm(doc=936)
         0.14283794 = weight(abstract_txt:model in 936) [ClassicSimilarity], result of:
           0.14283794 = score(doc=936,freq=9.0), product of:
             0.21840948 = queryWeight, product of:
               2.2941434 = boost
               3.986234 = idf(docFreq=2231, maxDocs=44218)
               0.023882957 = queryNorm
             0.6539915 = fieldWeight in 936, product of:
               3.0 = tf(freq=9.0), with freq of:
                 9.0 = termFreq=9.0
               3.986234 = idf(docFreq=2231, maxDocs=44218)
               0.0546875 = fieldNorm(doc=936)
         0.17111301 = weight(abstract_txt:expansion in 936) [ClassicSimilarity], result of:
           0.17111301 = score(doc=936,freq=1.0), product of:
             0.51244265 = queryWeight, product of:
               3.5140462 = boost
               6.1059003 = idf(docFreq=267, maxDocs=44218)
               0.023882957 = queryNorm
             0.33391643 = fieldWeight in 936, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.1059003 = idf(docFreq=267, maxDocs=44218)
               0.0546875 = fieldNorm(doc=936)
       0.32 = coord(8/25)
   

5. Ruthven, T.; Lalmas, M.; Rijsbergen, K.van: Incorporating user research behavior into relevance feedback (2003) 0.21

   0.20522507 = sum of:
     0.20522507 = product of:
       0.64132833 = sum of:
         0.01802655 = weight(abstract_txt:retrieval in 5169) [ClassicSimilarity], result of:
           0.01802655 = score(doc=5169,freq=1.0), product of:
             0.08299661 = queryWeight, product of:
               3.4751394 = idf(docFreq=3720, maxDocs=44218)
               0.023882957 = queryNorm
             0.21719621 = fieldWeight in 5169, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.4751394 = idf(docFreq=3720, maxDocs=44218)
               0.0625 = fieldNorm(doc=5169)
         0.037183832 = weight(abstract_txt:user in 5169) [ClassicSimilarity], result of:
           0.037183832 = score(doc=5169,freq=3.0), product of:
             0.09324974 = queryWeight, product of:
               1.0599701 = boost
               3.6835442 = idf(docFreq=3020, maxDocs=44218)
               0.023882957 = queryNorm
             0.39875534 = fieldWeight in 5169, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               3.6835442 = idf(docFreq=3020, maxDocs=44218)
               0.0625 = fieldNorm(doc=5169)
         0.017431261 = weight(abstract_txt:with in 5169) [ClassicSimilarity], result of:
           0.017431261 = score(doc=5169,freq=3.0), product of:
             0.06441611 = queryWeight, product of:
               1.0789783 = boost
               2.4997334 = idf(docFreq=9868, maxDocs=44218)
               0.023882957 = queryNorm
             0.27060407 = fieldWeight in 5169, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               2.4997334 = idf(docFreq=9868, maxDocs=44218)
               0.0625 = fieldNorm(doc=5169)
         0.038778733 = weight(abstract_txt:evaluation in 5169) [ClassicSimilarity], result of:
           0.038778733 = score(doc=5169,freq=1.0), product of:
             0.13830812 = queryWeight, product of:
               1.2909032 = boost
               4.4860687 = idf(docFreq=1353, maxDocs=44218)
               0.023882957 = queryNorm
             0.2803793 = fieldWeight in 5169, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.4860687 = idf(docFreq=1353, maxDocs=44218)
               0.0625 = fieldNorm(doc=5169)
         0.04941958 = weight(abstract_txt:system in 5169) [ClassicSimilarity], result of:
           0.04941958 = score(doc=5169,freq=4.0), product of:
             0.1172362 = queryWeight, product of:
               1.4556143 = boost
               3.3723085 = idf(docFreq=4123, maxDocs=44218)
               0.023882957 = queryNorm
             0.42153856 = fieldWeight in 5169, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               3.3723085 = idf(docFreq=4123, maxDocs=44218)
               0.0625 = fieldNorm(doc=5169)
         0.025589852 = weight(abstract_txt:systems in 5169) [ClassicSimilarity], result of:
           0.025589852 = score(doc=5169,freq=1.0), product of:
             0.12000358 = queryWeight, product of:
               1.4726942 = boost
               3.4118783 = idf(docFreq=3963, maxDocs=44218)
               0.023882957 = queryNorm
             0.2132424 = fieldWeight in 5169, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.4118783 = idf(docFreq=3963, maxDocs=44218)
               0.0625 = fieldNorm(doc=5169)
         0.0637831 = weight(abstract_txt:documents in 5169) [ClassicSimilarity], result of:
           0.0637831 = score(doc=5169,freq=2.0), product of:
             0.17509596 = queryWeight, product of:
               1.7789081 = boost
               4.1213026 = idf(docFreq=1949, maxDocs=44218)
               0.023882957 = queryNorm
             0.36427513 = fieldWeight in 5169, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               4.1213026 = idf(docFreq=1949, maxDocs=44218)
               0.0625 = fieldNorm(doc=5169)
         0.39111546 = weight(abstract_txt:expansion in 5169) [ClassicSimilarity], result of:
           0.39111546 = score(doc=5169,freq=4.0), product of:
             0.51244265 = queryWeight, product of:
               3.5140462 = boost
               6.1059003 = idf(docFreq=267, maxDocs=44218)
               0.023882957 = queryNorm
             0.76323754 = fieldWeight in 5169, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               6.1059003 = idf(docFreq=267, maxDocs=44218)
               0.0625 = fieldNorm(doc=5169)
       0.32 = coord(8/25)