Document (#41469)

Author

Ackerman, B.
Wang, C.
Chen, Y.

Title

¬A session-specific opportunity cost model for rank-oriented recommendation

Source

Journal of the Association for Information Science and Technology. 69(2018) no.10, S.1259-1270

Year

2018

Abstract

Recommender systems are changing the way that people find information, products, and even other people. This paper studies the problem of leveraging the context of the items presented to the user in a user/system interaction session to improve the recommender system's ranking prediction. We propose a novel model that incorporates the opportunity cost of giving up the other items in the session and computes session-specific relevance values for items for context-aware recommendation. The model can work on a variety of different problems settings with emphasis on implicit user feedback as it supports varying levels of ordinal relevance. Experimental evaluation demonstrates the advantages of our new model with respect to the ranking quality.

Content

Vgl.: https://onlinelibrary.wiley.com/doi/10.1002/asi.24044.

Similar documents (author)

1. Wang, E.T.G.; Chen, H.H.G.; Jiang, J.J.; Klein, G.: Interaction quality between IS professionals and users : impacting conflict and project performance (2005) 2.80

   2.8005137 = sum of:
     2.8005137 = sum of:
       1.2681124 = weight(author_txt:chen in 5387) [ClassicSimilarity], result of:
         1.2681124 = score(doc=5387,freq=1.0), product of:
           0.66123426 = queryWeight, product of:
             6.136947 = idf(docFreq=260, maxDocs=44421)
             0.107746445 = queryNorm
           1.917796 = fieldWeight in 5387, product of:
             1.0 = tf(freq=1.0), with freq of:
               1.0 = termFreq=1.0
             6.136947 = idf(docFreq=260, maxDocs=44421)
             0.3125 = fieldNorm(doc=5387)
       1.5324014 = weight(author_txt:wang in 5387) [ClassicSimilarity], result of:
         1.5324014 = score(doc=5387,freq=1.0), product of:
           0.7501795 = queryWeight, product of:
             1.0651357 = boost
             6.5366817 = idf(docFreq=174, maxDocs=44421)
             0.107746445 = queryNorm
           2.042713 = fieldWeight in 5387, product of:
             1.0 = tf(freq=1.0), with freq of:
               1.0 = termFreq=1.0
             6.5366817 = idf(docFreq=174, maxDocs=44421)
             0.3125 = fieldNorm(doc=5387)
   

2. Cui, C.; Ma, J.; Lian, T.; Chen, Z.; Wang, S.: Improving image annotation via ranking-oriented neighbor search and learning-based keyword propagation (2015) 2.80

   2.8005137 = sum of:
     2.8005137 = sum of:
       1.2681124 = weight(author_txt:chen in 2609) [ClassicSimilarity], result of:
         1.2681124 = score(doc=2609,freq=1.0), product of:
           0.66123426 = queryWeight, product of:
             6.136947 = idf(docFreq=260, maxDocs=44421)
             0.107746445 = queryNorm
           1.917796 = fieldWeight in 2609, product of:
             1.0 = tf(freq=1.0), with freq of:
               1.0 = termFreq=1.0
             6.136947 = idf(docFreq=260, maxDocs=44421)
             0.3125 = fieldNorm(doc=2609)
       1.5324014 = weight(author_txt:wang in 2609) [ClassicSimilarity], result of:
         1.5324014 = score(doc=2609,freq=1.0), product of:
           0.7501795 = queryWeight, product of:
             1.0651357 = boost
             6.5366817 = idf(docFreq=174, maxDocs=44421)
             0.107746445 = queryNorm
           2.042713 = fieldWeight in 2609, product of:
             1.0 = tf(freq=1.0), with freq of:
               1.0 = termFreq=1.0
             6.5366817 = idf(docFreq=174, maxDocs=44421)
             0.3125 = fieldNorm(doc=2609)
   

3. Tsai, M.-.F.; Chen, H.-H.; Wang, Y.-T.: Learning a merge model for multilingual information retrieval (2011) 2.80

   2.8005137 = sum of:
     2.8005137 = sum of:
       1.2681124 = weight(author_txt:chen in 3750) [ClassicSimilarity], result of:
         1.2681124 = score(doc=3750,freq=1.0), product of:
           0.66123426 = queryWeight, product of:
             6.136947 = idf(docFreq=260, maxDocs=44421)
             0.107746445 = queryNorm
           1.917796 = fieldWeight in 3750, product of:
             1.0 = tf(freq=1.0), with freq of:
               1.0 = termFreq=1.0
             6.136947 = idf(docFreq=260, maxDocs=44421)
             0.3125 = fieldNorm(doc=3750)
       1.5324014 = weight(author_txt:wang in 3750) [ClassicSimilarity], result of:
         1.5324014 = score(doc=3750,freq=1.0), product of:
           0.7501795 = queryWeight, product of:
             1.0651357 = boost
             6.5366817 = idf(docFreq=174, maxDocs=44421)
             0.107746445 = queryNorm
           2.042713 = fieldWeight in 3750, product of:
             1.0 = tf(freq=1.0), with freq of:
               1.0 = termFreq=1.0
             6.5366817 = idf(docFreq=174, maxDocs=44421)
             0.3125 = fieldNorm(doc=3750)
   

4. Huang, H.-H.; Wang, J.-J.; Chen, H.-H.: Implicit opinion analysis : extraction and polarity labelling (2017) 2.80

   2.8005137 = sum of:
     2.8005137 = sum of:
       1.2681124 = weight(author_txt:chen in 4820) [ClassicSimilarity], result of:
         1.2681124 = score(doc=4820,freq=1.0), product of:
           0.66123426 = queryWeight, product of:
             6.136947 = idf(docFreq=260, maxDocs=44421)
             0.107746445 = queryNorm
           1.917796 = fieldWeight in 4820, product of:
             1.0 = tf(freq=1.0), with freq of:
               1.0 = termFreq=1.0
             6.136947 = idf(docFreq=260, maxDocs=44421)
             0.3125 = fieldNorm(doc=4820)
       1.5324014 = weight(author_txt:wang in 4820) [ClassicSimilarity], result of:
         1.5324014 = score(doc=4820,freq=1.0), product of:
           0.7501795 = queryWeight, product of:
             1.0651357 = boost
             6.5366817 = idf(docFreq=174, maxDocs=44421)
             0.107746445 = queryNorm
           2.042713 = fieldWeight in 4820, product of:
             1.0 = tf(freq=1.0), with freq of:
               1.0 = termFreq=1.0
             6.5366817 = idf(docFreq=174, maxDocs=44421)
             0.3125 = fieldNorm(doc=4820)
   

5. Wang, C.; Zhao, S.; Kalra, A.; Borcea, C.; Chen, Y.: Predictive models and analysis for webpage depth-level dwell time (2018) 2.80

   2.8005137 = sum of:
     2.8005137 = sum of:
       1.2681124 = weight(author_txt:chen in 370) [ClassicSimilarity], result of:
         1.2681124 = score(doc=370,freq=1.0), product of:
           0.66123426 = queryWeight, product of:
             6.136947 = idf(docFreq=260, maxDocs=44421)
             0.107746445 = queryNorm
           1.917796 = fieldWeight in 370, product of:
             1.0 = tf(freq=1.0), with freq of:
               1.0 = termFreq=1.0
             6.136947 = idf(docFreq=260, maxDocs=44421)
             0.3125 = fieldNorm(doc=370)
       1.5324014 = weight(author_txt:wang in 370) [ClassicSimilarity], result of:
         1.5324014 = score(doc=370,freq=1.0), product of:
           0.7501795 = queryWeight, product of:
             1.0651357 = boost
             6.5366817 = idf(docFreq=174, maxDocs=44421)
             0.107746445 = queryNorm
           2.042713 = fieldWeight in 370, product of:
             1.0 = tf(freq=1.0), with freq of:
               1.0 = termFreq=1.0
             6.5366817 = idf(docFreq=174, maxDocs=44421)
             0.3125 = fieldNorm(doc=370)
   

Similar documents (content)

1. Greenstein-Messica, A.; Rokach, L.; Shabtai, A.: Personal-discount sensitivity prediction for mobile coupon conversion optimization (2017) 0.24

   0.24146456 = sum of:
     0.24146456 = product of:
       0.75457674 = sum of:
         0.08773958 = weight(abstract_txt:aware in 4751) [ClassicSimilarity], result of:
           0.08773958 = score(doc=4751,freq=3.0), product of:
             0.12149602 = queryWeight, product of:
               6.6710296 = idf(docFreq=152, maxDocs=44421)
               0.018212484 = queryNorm
             0.7221601 = fieldWeight in 4751, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               6.6710296 = idf(docFreq=152, maxDocs=44421)
               0.0625 = fieldNorm(doc=4751)
         0.08971563 = weight(abstract_txt:prediction in 4751) [ClassicSimilarity], result of:
           0.08971563 = score(doc=4751,freq=2.0), product of:
             0.14115866 = queryWeight, product of:
               1.0778857 = boost
               7.190608 = idf(docFreq=90, maxDocs=44421)
               0.018212484 = queryNorm
             0.63556594 = fieldWeight in 4751, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               7.190608 = idf(docFreq=90, maxDocs=44421)
               0.0625 = fieldNorm(doc=4751)
         0.027241534 = weight(abstract_txt:specific in 4751) [ClassicSimilarity], result of:
           0.027241534 = score(doc=4751,freq=1.0), product of:
             0.10122857 = queryWeight, product of:
               1.290879 = boost
               4.305746 = idf(docFreq=1628, maxDocs=44421)
               0.018212484 = queryNorm
             0.26910913 = fieldWeight in 4751, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.305746 = idf(docFreq=1628, maxDocs=44421)
               0.0625 = fieldNorm(doc=4751)
         0.048089635 = weight(abstract_txt:context in 4751) [ClassicSimilarity], result of:
           0.048089635 = score(doc=4751,freq=3.0), product of:
             0.102520175 = queryWeight, product of:
               1.2990882 = boost
               4.333128 = idf(docFreq=1584, maxDocs=44421)
               0.018212484 = queryNorm
             0.46907485 = fieldWeight in 4751, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               4.333128 = idf(docFreq=1584, maxDocs=44421)
               0.0625 = fieldNorm(doc=4751)
         0.036103014 = weight(abstract_txt:user in 4751) [ClassicSimilarity], result of:
           0.036103014 = score(doc=4751,freq=2.0), product of:
             0.1109681 = queryWeight, product of:
               1.6553075 = boost
               3.6808684 = idf(docFreq=3042, maxDocs=44421)
               0.018212484 = queryNorm
             0.32534587 = fieldWeight in 4751, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               3.6808684 = idf(docFreq=3042, maxDocs=44421)
               0.0625 = fieldNorm(doc=4751)
         0.09607277 = weight(abstract_txt:opportunity in 4751) [ClassicSimilarity], result of:
           0.09607277 = score(doc=4751,freq=1.0), product of:
             0.23453932 = queryWeight, product of:
               1.9649061 = boost
               6.553973 = idf(docFreq=171, maxDocs=44421)
               0.018212484 = queryNorm
             0.40962332 = fieldWeight in 4751, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.553973 = idf(docFreq=171, maxDocs=44421)
               0.0625 = fieldNorm(doc=4751)
         0.043119725 = weight(abstract_txt:model in 4751) [ClassicSimilarity], result of:
           0.043119725 = score(doc=4751,freq=1.0), product of:
             0.17322454 = queryWeight, product of:
               2.3881063 = boost
               3.9827821 = idf(docFreq=2249, maxDocs=44421)
               0.018212484 = queryNorm
             0.24892388 = fieldWeight in 4751, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.9827821 = idf(docFreq=2249, maxDocs=44421)
               0.0625 = fieldNorm(doc=4751)
         0.32649487 = weight(abstract_txt:recommender in 4751) [ClassicSimilarity], result of:
           0.32649487 = score(doc=4751,freq=3.0), product of:
             0.36758626 = queryWeight, product of:
               2.4598782 = boost
               8.20496 = idf(docFreq=32, maxDocs=44421)
               0.018212484 = queryNorm
             0.8882129 = fieldWeight in 4751, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               8.20496 = idf(docFreq=32, maxDocs=44421)
               0.0625 = fieldNorm(doc=4751)
       0.32 = coord(8/25)
   

2. Greenstein-Messica, A.; Rokach, L.; Shabtai, A.: Personal-discount sensitivity prediction for mobile coupon conversion optimization (2017) 0.24

   0.24146456 = sum of:
     0.24146456 = product of:
       0.75457674 = sum of:
         0.08773958 = weight(abstract_txt:aware in 4761) [ClassicSimilarity], result of:
           0.08773958 = score(doc=4761,freq=3.0), product of:
             0.12149602 = queryWeight, product of:
               6.6710296 = idf(docFreq=152, maxDocs=44421)
               0.018212484 = queryNorm
             0.7221601 = fieldWeight in 4761, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               6.6710296 = idf(docFreq=152, maxDocs=44421)
               0.0625 = fieldNorm(doc=4761)
         0.08971563 = weight(abstract_txt:prediction in 4761) [ClassicSimilarity], result of:
           0.08971563 = score(doc=4761,freq=2.0), product of:
             0.14115866 = queryWeight, product of:
               1.0778857 = boost
               7.190608 = idf(docFreq=90, maxDocs=44421)
               0.018212484 = queryNorm
             0.63556594 = fieldWeight in 4761, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               7.190608 = idf(docFreq=90, maxDocs=44421)
               0.0625 = fieldNorm(doc=4761)
         0.027241534 = weight(abstract_txt:specific in 4761) [ClassicSimilarity], result of:
           0.027241534 = score(doc=4761,freq=1.0), product of:
             0.10122857 = queryWeight, product of:
               1.290879 = boost
               4.305746 = idf(docFreq=1628, maxDocs=44421)
               0.018212484 = queryNorm
             0.26910913 = fieldWeight in 4761, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.305746 = idf(docFreq=1628, maxDocs=44421)
               0.0625 = fieldNorm(doc=4761)
         0.048089635 = weight(abstract_txt:context in 4761) [ClassicSimilarity], result of:
           0.048089635 = score(doc=4761,freq=3.0), product of:
             0.102520175 = queryWeight, product of:
               1.2990882 = boost
               4.333128 = idf(docFreq=1584, maxDocs=44421)
               0.018212484 = queryNorm
             0.46907485 = fieldWeight in 4761, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               4.333128 = idf(docFreq=1584, maxDocs=44421)
               0.0625 = fieldNorm(doc=4761)
         0.036103014 = weight(abstract_txt:user in 4761) [ClassicSimilarity], result of:
           0.036103014 = score(doc=4761,freq=2.0), product of:
             0.1109681 = queryWeight, product of:
               1.6553075 = boost
               3.6808684 = idf(docFreq=3042, maxDocs=44421)
               0.018212484 = queryNorm
             0.32534587 = fieldWeight in 4761, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               3.6808684 = idf(docFreq=3042, maxDocs=44421)
               0.0625 = fieldNorm(doc=4761)
         0.09607277 = weight(abstract_txt:opportunity in 4761) [ClassicSimilarity], result of:
           0.09607277 = score(doc=4761,freq=1.0), product of:
             0.23453932 = queryWeight, product of:
               1.9649061 = boost
               6.553973 = idf(docFreq=171, maxDocs=44421)
               0.018212484 = queryNorm
             0.40962332 = fieldWeight in 4761, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.553973 = idf(docFreq=171, maxDocs=44421)
               0.0625 = fieldNorm(doc=4761)
         0.043119725 = weight(abstract_txt:model in 4761) [ClassicSimilarity], result of:
           0.043119725 = score(doc=4761,freq=1.0), product of:
             0.17322454 = queryWeight, product of:
               2.3881063 = boost
               3.9827821 = idf(docFreq=2249, maxDocs=44421)
               0.018212484 = queryNorm
             0.24892388 = fieldWeight in 4761, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.9827821 = idf(docFreq=2249, maxDocs=44421)
               0.0625 = fieldNorm(doc=4761)
         0.32649487 = weight(abstract_txt:recommender in 4761) [ClassicSimilarity], result of:
           0.32649487 = score(doc=4761,freq=3.0), product of:
             0.36758626 = queryWeight, product of:
               2.4598782 = boost
               8.20496 = idf(docFreq=32, maxDocs=44421)
               0.018212484 = queryNorm
             0.8882129 = fieldWeight in 4761, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               8.20496 = idf(docFreq=32, maxDocs=44421)
               0.0625 = fieldNorm(doc=4761)
       0.32 = coord(8/25)
   

3. Sappelli, M.; Verberne, S.; Kraaij, W.: Evaluation of context-aware recommendation systems for information re-finding (2017) 0.19

   0.19131999 = sum of:
     0.19131999 = product of:
       0.68328565 = sum of:
         0.08773958 = weight(abstract_txt:aware in 4528) [ClassicSimilarity], result of:
           0.08773958 = score(doc=4528,freq=3.0), product of:
             0.12149602 = queryWeight, product of:
               6.6710296 = idf(docFreq=152, maxDocs=44421)
               0.018212484 = queryNorm
             0.7221601 = fieldWeight in 4528, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               6.6710296 = idf(docFreq=152, maxDocs=44421)
               0.0625 = fieldNorm(doc=4528)
         0.063438535 = weight(abstract_txt:prediction in 4528) [ClassicSimilarity], result of:
           0.063438535 = score(doc=4528,freq=1.0), product of:
             0.14115866 = queryWeight, product of:
               1.0778857 = boost
               7.190608 = idf(docFreq=90, maxDocs=44421)
               0.018212484 = queryNorm
             0.449413 = fieldWeight in 4528, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.190608 = idf(docFreq=90, maxDocs=44421)
               0.0625 = fieldNorm(doc=4528)
         0.07853005 = weight(abstract_txt:context in 4528) [ClassicSimilarity], result of:
           0.07853005 = score(doc=4528,freq=8.0), product of:
             0.102520175 = queryWeight, product of:
               1.2990882 = boost
               4.333128 = idf(docFreq=1584, maxDocs=44421)
               0.018212484 = queryNorm
             0.76599604 = fieldWeight in 4528, product of:
               2.828427 = tf(freq=8.0), with freq of:
                 8.0 = termFreq=8.0
               4.333128 = idf(docFreq=1584, maxDocs=44421)
               0.0625 = fieldNorm(doc=4528)
         0.081758596 = weight(abstract_txt:relevance in 4528) [ClassicSimilarity], result of:
           0.081758596 = score(doc=4528,freq=4.0), product of:
             0.13268374 = queryWeight, product of:
               1.4778924 = boost
               4.929532 = idf(docFreq=872, maxDocs=44421)
               0.018212484 = queryNorm
             0.6161915 = fieldWeight in 4528, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               4.929532 = idf(docFreq=872, maxDocs=44421)
               0.0625 = fieldNorm(doc=4528)
         0.036103014 = weight(abstract_txt:user in 4528) [ClassicSimilarity], result of:
           0.036103014 = score(doc=4528,freq=2.0), product of:
             0.1109681 = queryWeight, product of:
               1.6553075 = boost
               3.6808684 = idf(docFreq=3042, maxDocs=44421)
               0.018212484 = queryNorm
             0.32534587 = fieldWeight in 4528, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               3.6808684 = idf(docFreq=3042, maxDocs=44421)
               0.0625 = fieldNorm(doc=4528)
         0.29259613 = weight(abstract_txt:recommendation in 4528) [ClassicSimilarity], result of:
           0.29259613 = score(doc=4528,freq=6.0), product of:
             0.2711923 = queryWeight, product of:
               2.1128695 = boost
               7.0475073 = idf(docFreq=104, maxDocs=44421)
               0.018212484 = queryNorm
             1.0789249 = fieldWeight in 4528, product of:
               2.4494898 = tf(freq=6.0), with freq of:
                 6.0 = termFreq=6.0
               7.0475073 = idf(docFreq=104, maxDocs=44421)
               0.0625 = fieldNorm(doc=4528)
         0.043119725 = weight(abstract_txt:model in 4528) [ClassicSimilarity], result of:
           0.043119725 = score(doc=4528,freq=1.0), product of:
             0.17322454 = queryWeight, product of:
               2.3881063 = boost
               3.9827821 = idf(docFreq=2249, maxDocs=44421)
               0.018212484 = queryNorm
             0.24892388 = fieldWeight in 4528, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.9827821 = idf(docFreq=2249, maxDocs=44421)
               0.0625 = fieldNorm(doc=4528)
       0.28 = coord(7/25)
   

4. Hemmje, M.; Kunkel, C.; Willett, A.: LyberWorld - a visualization user interface supporting fulltext retrieval (1994) 0.19

   0.1901412 = sum of:
     0.1901412 = product of:
       0.6790757 = sum of:
         0.075270265 = weight(abstract_txt:system's in 3384) [ClassicSimilarity], result of:
           0.075270265 = score(doc=3384,freq=1.0), product of:
             0.1363372 = queryWeight, product of:
               1.0593176 = boost
               7.0667386 = idf(docFreq=102, maxDocs=44421)
               0.018212484 = queryNorm
             0.552089 = fieldWeight in 3384, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.0667386 = idf(docFreq=102, maxDocs=44421)
               0.078125 = fieldNorm(doc=3384)
         0.034705706 = weight(abstract_txt:context in 3384) [ClassicSimilarity], result of:
           0.034705706 = score(doc=3384,freq=1.0), product of:
             0.102520175 = queryWeight, product of:
               1.2990882 = boost
               4.333128 = idf(docFreq=1584, maxDocs=44421)
               0.018212484 = queryNorm
             0.33852562 = fieldWeight in 3384, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.333128 = idf(docFreq=1584, maxDocs=44421)
               0.078125 = fieldNorm(doc=3384)
         0.07226507 = weight(abstract_txt:relevance in 3384) [ClassicSimilarity], result of:
           0.07226507 = score(doc=3384,freq=2.0), product of:
             0.13268374 = queryWeight, product of:
               1.4778924 = boost
               4.929532 = idf(docFreq=872, maxDocs=44421)
               0.018212484 = queryNorm
             0.5446415 = fieldWeight in 3384, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               4.929532 = idf(docFreq=872, maxDocs=44421)
               0.078125 = fieldNorm(doc=3384)
         0.045128766 = weight(abstract_txt:user in 3384) [ClassicSimilarity], result of:
           0.045128766 = score(doc=3384,freq=2.0), product of:
             0.1109681 = queryWeight, product of:
               1.6553075 = boost
               3.6808684 = idf(docFreq=3042, maxDocs=44421)
               0.018212484 = queryNorm
             0.40668234 = fieldWeight in 3384, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               3.6808684 = idf(docFreq=3042, maxDocs=44421)
               0.078125 = fieldNorm(doc=3384)
         0.07622562 = weight(abstract_txt:model in 3384) [ClassicSimilarity], result of:
           0.07622562 = score(doc=3384,freq=2.0), product of:
             0.17322454 = queryWeight, product of:
               2.3881063 = boost
               3.9827821 = idf(docFreq=2249, maxDocs=44421)
               0.018212484 = queryNorm
             0.4400394 = fieldWeight in 3384, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               3.9827821 = idf(docFreq=2249, maxDocs=44421)
               0.078125 = fieldNorm(doc=3384)
         0.1111094 = weight(abstract_txt:items in 3384) [ClassicSimilarity], result of:
           0.1111094 = score(doc=3384,freq=1.0), product of:
             0.25492144 = queryWeight, product of:
               2.5088966 = boost
               5.5789747 = idf(docFreq=455, maxDocs=44421)
               0.018212484 = queryNorm
             0.43585742 = fieldWeight in 3384, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.5789747 = idf(docFreq=455, maxDocs=44421)
               0.078125 = fieldNorm(doc=3384)
         0.26437092 = weight(abstract_txt:session in 3384) [ClassicSimilarity], result of:
           0.26437092 = score(doc=3384,freq=1.0), product of:
             0.50006664 = queryWeight, product of:
               4.057541 = boost
               6.7669935 = idf(docFreq=138, maxDocs=44421)
               0.018212484 = queryNorm
             0.5286714 = fieldWeight in 3384, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.7669935 = idf(docFreq=138, maxDocs=44421)
               0.078125 = fieldNorm(doc=3384)
       0.28 = coord(7/25)
   

5. Shani, G.; Rokach, L.; Shapira, B.; Hadash, S.; Tangi, M.: Investigating confidence displays for top-N recommendations (2013) 0.13

   0.13074882 = sum of:
     0.13074882 = product of:
       0.6537441 = sum of:
         0.106448226 = weight(abstract_txt:system's in 2136) [ClassicSimilarity], result of:
           0.106448226 = score(doc=2136,freq=2.0), product of:
             0.1363372 = queryWeight, product of:
               1.0593176 = boost
               7.0667386 = idf(docFreq=102, maxDocs=44421)
               0.018212484 = queryNorm
             0.7807717 = fieldWeight in 2136, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               7.0667386 = idf(docFreq=102, maxDocs=44421)
               0.078125 = fieldNorm(doc=2136)
         0.051099118 = weight(abstract_txt:relevance in 2136) [ClassicSimilarity], result of:
           0.051099118 = score(doc=2136,freq=1.0), product of:
             0.13268374 = queryWeight, product of:
               1.4778924 = boost
               4.929532 = idf(docFreq=872, maxDocs=44421)
               0.018212484 = queryNorm
             0.38511968 = fieldWeight in 2136, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.929532 = idf(docFreq=872, maxDocs=44421)
               0.078125 = fieldNorm(doc=2136)
         0.045128766 = weight(abstract_txt:user in 2136) [ClassicSimilarity], result of:
           0.045128766 = score(doc=2136,freq=2.0), product of:
             0.1109681 = queryWeight, product of:
               1.6553075 = boost
               3.6808684 = idf(docFreq=3042, maxDocs=44421)
               0.018212484 = queryNorm
             0.40668234 = fieldWeight in 2136, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               3.6808684 = idf(docFreq=3042, maxDocs=44421)
               0.078125 = fieldNorm(doc=2136)
         0.25862086 = weight(abstract_txt:recommendation in 2136) [ClassicSimilarity], result of:
           0.25862086 = score(doc=2136,freq=3.0), product of:
             0.2711923 = queryWeight, product of:
               2.1128695 = boost
               7.0475073 = idf(docFreq=104, maxDocs=44421)
               0.018212484 = queryNorm
             0.9536438 = fieldWeight in 2136, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               7.0475073 = idf(docFreq=104, maxDocs=44421)
               0.078125 = fieldNorm(doc=2136)
         0.19244711 = weight(abstract_txt:items in 2136) [ClassicSimilarity], result of:
           0.19244711 = score(doc=2136,freq=3.0), product of:
             0.25492144 = queryWeight, product of:
               2.5088966 = boost
               5.5789747 = idf(docFreq=455, maxDocs=44421)
               0.018212484 = queryNorm
             0.75492716 = fieldWeight in 2136, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               5.5789747 = idf(docFreq=455, maxDocs=44421)
               0.078125 = fieldNorm(doc=2136)
       0.2 = coord(5/25)