Document (#36121)

Author

Dang, E.K.F.
Luk, R.W.P.
Allan, J.
Ho, K.S.
Chung, K.F.L.
Lee, D.L.

Title

¬A new context-dependent term weight computed by boost and discount using relevance information

Source

Journal of the American Society for Information Science and Technology. 61(2010) no.12, S.2514-2530

Year

2010

Abstract

We studied the effectiveness of a new class of context-dependent term weights for information retrieval. Unlike the traditional term frequency-inverse document frequency (TF-IDF), the new weighting of a term t in a document d depends not only on the occurrence statistics of t alone but also on the terms found within a text window (or "document-context") centered on t. We introduce a Boost and Discount (B&D) procedure which utilizes partial relevance information to compute the context-dependent term weights of query terms according to a logistic regression model. We investigate the effectiveness of the new term weights compared with the context-independent BM25 weights in the setting of relevance feedback. We performed experiments with title queries of the TREC-6, -7, -8, and 2005 collections, comparing the residual Mean Average Precision (MAP) measures obtained using B&D term weights and those obtained by a baseline using BM25 weights. Given either 10 or 20 relevance judgments of the top retrieved documents, using the new term weights yields improvement over the baseline for all collections tested. The MAP obtained with the new weights has relative improvement over the baseline by 3.3 to 15.2%, with statistical significance at the 95% confidence level across all four collections.

Theme

Retrievalalgorithmen

Similar documents (author)

1. Dang, E.K.F.; Luk, R.W.P.; Allan, J.: Beyond bag-of-words : bigram-enhanced context-dependent term weights (2014) 5.28

   5.280651 = sum of:
     5.280651 = product of:
       6.600814 = sum of:
         1.3493158 = weight(author_txt:allan in 1283) [ClassicSimilarity], result of:
           1.3493158 = score(doc=1283,freq=1.0), product of:
             0.40858102 = queryWeight, product of:
               1.0778395 = boost
               8.806516 = idf(docFreq=17, maxDocs=44218)
               0.04304473 = queryNorm
             3.3024435 = fieldWeight in 1283, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               8.806516 = idf(docFreq=17, maxDocs=44218)
               0.375 = fieldNorm(doc=1283)
         1.637928 = weight(author_txt:r.w.p in 1283) [ClassicSimilarity], result of:
           1.637928 = score(doc=1283,freq=1.0), product of:
             0.46494225 = queryWeight, product of:
               1.1497793 = boost
               9.394302 = idf(docFreq=9, maxDocs=44218)
               0.04304473 = queryNorm
             3.5228634 = fieldWeight in 1283, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               9.394302 = idf(docFreq=9, maxDocs=44218)
               0.375 = fieldNorm(doc=1283)
         1.6936581 = weight(author_txt:dang in 1283) [ClassicSimilarity], result of:
           1.6936581 = score(doc=1283,freq=1.0), product of:
             0.47542968 = queryWeight, product of:
               1.1626744 = boost
               9.499662 = idf(docFreq=8, maxDocs=44218)
               0.04304473 = queryNorm
             3.5623734 = fieldWeight in 1283, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               9.499662 = idf(docFreq=8, maxDocs=44218)
               0.375 = fieldNorm(doc=1283)
         1.9199125 = weight(author_txt:e.k.f in 1283) [ClassicSimilarity], result of:
           1.9199125 = score(doc=1283,freq=1.0), product of:
             0.51688045 = queryWeight, product of:
               1.2122998 = boost
               9.905128 = idf(docFreq=5, maxDocs=44218)
               0.04304473 = queryNorm
             3.7144227 = fieldWeight in 1283, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               9.905128 = idf(docFreq=5, maxDocs=44218)
               0.375 = fieldNorm(doc=1283)
       0.8 = coord(4/5)
   

2. Dang, E.K.F.; Luk, R.W.P.; Allan, J.: ¬A context-dependent relevance model (2016) 5.28

   5.280651 = sum of:
     5.280651 = product of:
       6.600814 = sum of:
         1.3493158 = weight(author_txt:allan in 2778) [ClassicSimilarity], result of:
           1.3493158 = score(doc=2778,freq=1.0), product of:
             0.40858102 = queryWeight, product of:
               1.0778395 = boost
               8.806516 = idf(docFreq=17, maxDocs=44218)
               0.04304473 = queryNorm
             3.3024435 = fieldWeight in 2778, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               8.806516 = idf(docFreq=17, maxDocs=44218)
               0.375 = fieldNorm(doc=2778)
         1.637928 = weight(author_txt:r.w.p in 2778) [ClassicSimilarity], result of:
           1.637928 = score(doc=2778,freq=1.0), product of:
             0.46494225 = queryWeight, product of:
               1.1497793 = boost
               9.394302 = idf(docFreq=9, maxDocs=44218)
               0.04304473 = queryNorm
             3.5228634 = fieldWeight in 2778, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               9.394302 = idf(docFreq=9, maxDocs=44218)
               0.375 = fieldNorm(doc=2778)
         1.6936581 = weight(author_txt:dang in 2778) [ClassicSimilarity], result of:
           1.6936581 = score(doc=2778,freq=1.0), product of:
             0.47542968 = queryWeight, product of:
               1.1626744 = boost
               9.499662 = idf(docFreq=8, maxDocs=44218)
               0.04304473 = queryNorm
             3.5623734 = fieldWeight in 2778, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               9.499662 = idf(docFreq=8, maxDocs=44218)
               0.375 = fieldNorm(doc=2778)
         1.9199125 = weight(author_txt:e.k.f in 2778) [ClassicSimilarity], result of:
           1.9199125 = score(doc=2778,freq=1.0), product of:
             0.51688045 = queryWeight, product of:
               1.2122998 = boost
               9.905128 = idf(docFreq=5, maxDocs=44218)
               0.04304473 = queryNorm
             3.7144227 = fieldWeight in 2778, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               9.905128 = idf(docFreq=5, maxDocs=44218)
               0.375 = fieldNorm(doc=2778)
       0.8 = coord(4/5)
   

3. Dang, E.K.F.; Luk, R.W.P.; Allan, J.: ¬A retrieval model family based on the probability ranking principle for ad hoc retrieval (2022) 5.28

   5.280651 = sum of:
     5.280651 = product of:
       6.600814 = sum of:
         1.3493158 = weight(author_txt:allan in 638) [ClassicSimilarity], result of:
           1.3493158 = score(doc=638,freq=1.0), product of:
             0.40858102 = queryWeight, product of:
               1.0778395 = boost
               8.806516 = idf(docFreq=17, maxDocs=44218)
               0.04304473 = queryNorm
             3.3024435 = fieldWeight in 638, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               8.806516 = idf(docFreq=17, maxDocs=44218)
               0.375 = fieldNorm(doc=638)
         1.637928 = weight(author_txt:r.w.p in 638) [ClassicSimilarity], result of:
           1.637928 = score(doc=638,freq=1.0), product of:
             0.46494225 = queryWeight, product of:
               1.1497793 = boost
               9.394302 = idf(docFreq=9, maxDocs=44218)
               0.04304473 = queryNorm
             3.5228634 = fieldWeight in 638, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               9.394302 = idf(docFreq=9, maxDocs=44218)
               0.375 = fieldNorm(doc=638)
         1.6936581 = weight(author_txt:dang in 638) [ClassicSimilarity], result of:
           1.6936581 = score(doc=638,freq=1.0), product of:
             0.47542968 = queryWeight, product of:
               1.1626744 = boost
               9.499662 = idf(docFreq=8, maxDocs=44218)
               0.04304473 = queryNorm
             3.5623734 = fieldWeight in 638, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               9.499662 = idf(docFreq=8, maxDocs=44218)
               0.375 = fieldNorm(doc=638)
         1.9199125 = weight(author_txt:e.k.f in 638) [ClassicSimilarity], result of:
           1.9199125 = score(doc=638,freq=1.0), product of:
             0.51688045 = queryWeight, product of:
               1.2122998 = boost
               9.905128 = idf(docFreq=5, maxDocs=44218)
               0.04304473 = queryNorm
             3.7144227 = fieldWeight in 638, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               9.905128 = idf(docFreq=5, maxDocs=44218)
               0.375 = fieldNorm(doc=638)
       0.8 = coord(4/5)
   

4. Dang, E.K.F.; Luk, R.W.P.; Ho, K.S.; Chan, S.C.F.; Lee, D.L.: ¬A new measure of clustering effectiveness : algorithms and experimental studies (2008) 2.63

   2.6257496 = sum of:
     2.6257496 = product of:
       4.3762493 = sum of:
         1.36494 = weight(author_txt:r.w.p in 1367) [ClassicSimilarity], result of:
           1.36494 = score(doc=1367,freq=1.0), product of:
             0.46494225 = queryWeight, product of:
               1.1497793 = boost
               9.394302 = idf(docFreq=9, maxDocs=44218)
               0.04304473 = queryNorm
             2.9357195 = fieldWeight in 1367, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               9.394302 = idf(docFreq=9, maxDocs=44218)
               0.3125 = fieldNorm(doc=1367)
         1.4113817 = weight(author_txt:dang in 1367) [ClassicSimilarity], result of:
           1.4113817 = score(doc=1367,freq=1.0), product of:
             0.47542968 = queryWeight, product of:
               1.1626744 = boost
               9.499662 = idf(docFreq=8, maxDocs=44218)
               0.04304473 = queryNorm
             2.9686446 = fieldWeight in 1367, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               9.499662 = idf(docFreq=8, maxDocs=44218)
               0.3125 = fieldNorm(doc=1367)
         1.5999272 = weight(author_txt:e.k.f in 1367) [ClassicSimilarity], result of:
           1.5999272 = score(doc=1367,freq=1.0), product of:
             0.51688045 = queryWeight, product of:
               1.2122998 = boost
               9.905128 = idf(docFreq=5, maxDocs=44218)
               0.04304473 = queryNorm
             3.0953524 = fieldWeight in 1367, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               9.905128 = idf(docFreq=5, maxDocs=44218)
               0.3125 = fieldNorm(doc=1367)
       0.6 = coord(3/5)
   

5. Allan, A.: Library malpractice suit : could it happen to you? (1976) 0.45

   0.44977188 = sum of:
     0.44977188 = product of:
       2.2488594 = sum of:
         2.2488594 = weight(author_txt:allan in 3653) [ClassicSimilarity], result of:
           2.2488594 = score(doc=3653,freq=1.0), product of:
             0.40858102 = queryWeight, product of:
               1.0778395 = boost
               8.806516 = idf(docFreq=17, maxDocs=44218)
               0.04304473 = queryNorm
             5.504072 = fieldWeight in 3653, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               8.806516 = idf(docFreq=17, maxDocs=44218)
               0.625 = fieldNorm(doc=3653)
       0.2 = coord(1/5)
   

Similar documents (content)

1. Dang, E.K.F.; Luk, R.W.P.; Allan, J.: Beyond bag-of-words : bigram-enhanced context-dependent term weights (2014) 0.91

   0.91288316 = sum of:
     0.91288316 = product of:
       1.5214719 = sum of:
         0.04040853 = weight(abstract_txt:inverse in 1283) [ClassicSimilarity], result of:
           0.04040853 = score(doc=1283,freq=1.0), product of:
             0.09609124 = queryWeight, product of:
               1.0092139 = boost
               7.689554 = idf(docFreq=54, maxDocs=44218)
               0.012382246 = queryNorm
             0.4205225 = fieldWeight in 1283, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.689554 = idf(docFreq=54, maxDocs=44218)
               0.0546875 = fieldNorm(doc=1283)
         0.011754118 = weight(abstract_txt:terms in 1283) [ClassicSimilarity], result of:
           0.011754118 = score(doc=1283,freq=1.0), product of:
             0.05315023 = queryWeight, product of:
               1.0614729 = boost
               4.0438666 = idf(docFreq=2106, maxDocs=44218)
               0.012382246 = queryNorm
             0.22114895 = fieldWeight in 1283, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.0438666 = idf(docFreq=2106, maxDocs=44218)
               0.0546875 = fieldNorm(doc=1283)
         0.011105565 = weight(abstract_txt:with in 1283) [ClassicSimilarity], result of:
           0.011105565 = score(doc=1283,freq=4.0), product of:
             0.040618967 = queryWeight, product of:
               1.312308 = boost
               2.4997334 = idf(docFreq=9868, maxDocs=44218)
               0.012382246 = queryNorm
             0.27340835 = fieldWeight in 1283, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               2.4997334 = idf(docFreq=9868, maxDocs=44218)
               0.0546875 = fieldNorm(doc=1283)
         0.05288307 = weight(abstract_txt:frequency in 1283) [ClassicSimilarity], result of:
           0.05288307 = score(doc=1283,freq=2.0), product of:
             0.11496868 = queryWeight, product of:
               1.5611552 = boost
               5.947494 = idf(docFreq=313, maxDocs=44218)
               0.012382246 = queryNorm
             0.45997804 = fieldWeight in 1283, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               5.947494 = idf(docFreq=313, maxDocs=44218)
               0.0546875 = fieldNorm(doc=1283)
         0.04137967 = weight(abstract_txt:improvement in 1283) [ClassicSimilarity], result of:
           0.04137967 = score(doc=1283,freq=1.0), product of:
             0.122999445 = queryWeight, product of:
               1.6147597 = boost
               6.1517096 = idf(docFreq=255, maxDocs=44218)
               0.012382246 = queryNorm
             0.3364216 = fieldWeight in 1283, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.1517096 = idf(docFreq=255, maxDocs=44218)
               0.0546875 = fieldNorm(doc=1283)
         0.0365271 = weight(abstract_txt:document in 1283) [ClassicSimilarity], result of:
           0.0365271 = score(doc=1283,freq=3.0), product of:
             0.089834936 = queryWeight, product of:
               1.6901474 = boost
               4.2926083 = idf(docFreq=1642, maxDocs=44218)
               0.012382246 = queryNorm
             0.4066024 = fieldWeight in 1283, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               4.2926083 = idf(docFreq=1642, maxDocs=44218)
               0.0546875 = fieldNorm(doc=1283)
         0.02557362 = weight(abstract_txt:using in 1283) [ClassicSimilarity], result of:
           0.02557362 = score(doc=1283,freq=3.0), product of:
             0.07796078 = queryWeight, product of:
               1.818065 = boost
               3.4631186 = idf(docFreq=3765, maxDocs=44218)
               0.012382246 = queryNorm
             0.32803187 = fieldWeight in 1283, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               3.4631186 = idf(docFreq=3765, maxDocs=44218)
               0.0546875 = fieldNorm(doc=1283)
         0.027572153 = weight(abstract_txt:collections in 1283) [ClassicSimilarity], result of:
           0.027572153 = score(doc=1283,freq=1.0), product of:
             0.107412785 = queryWeight, product of:
               1.848119 = boost
               4.693822 = idf(docFreq=1099, maxDocs=44218)
               0.012382246 = queryNorm
             0.2566934 = fieldWeight in 1283, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.693822 = idf(docFreq=1099, maxDocs=44218)
               0.0546875 = fieldNorm(doc=1283)
         0.050864547 = weight(abstract_txt:obtained in 1283) [ClassicSimilarity], result of:
           0.050864547 = score(doc=1283,freq=1.0), product of:
             0.16156687 = queryWeight, product of:
               2.2666168 = boost
               5.756716 = idf(docFreq=379, maxDocs=44218)
               0.012382246 = queryNorm
             0.3148204 = fieldWeight in 1283, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.756716 = idf(docFreq=379, maxDocs=44218)
               0.0546875 = fieldNorm(doc=1283)
         0.1290952 = weight(abstract_txt:bm25 in 1283) [ClassicSimilarity], result of:
           0.1290952 = score(doc=1283,freq=1.0), product of:
             0.26261437 = queryWeight, product of:
               2.359476 = boost
               8.988837 = idf(docFreq=14, maxDocs=44218)
               0.012382246 = queryNorm
             0.49157703 = fieldWeight in 1283, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               8.988837 = idf(docFreq=14, maxDocs=44218)
               0.0546875 = fieldNorm(doc=1283)
         0.121260814 = weight(abstract_txt:dependent in 1283) [ClassicSimilarity], result of:
           0.121260814 = score(doc=1283,freq=3.0), product of:
             0.19991656 = queryWeight, product of:
               2.5213106 = boost
               6.4035826 = idf(docFreq=198, maxDocs=44218)
               0.012382246 = queryNorm
             0.60655713 = fieldWeight in 1283, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               6.4035826 = idf(docFreq=198, maxDocs=44218)
               0.0546875 = fieldNorm(doc=1283)
         0.07386169 = weight(abstract_txt:relevance in 1283) [ClassicSimilarity], result of:
           0.07386169 = score(doc=1283,freq=3.0), product of:
             0.15811056 = queryWeight, product of:
               2.5891175 = boost
               4.931848 = idf(docFreq=866, maxDocs=44218)
               0.012382246 = queryNorm
             0.46715218 = fieldWeight in 1283, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               4.931848 = idf(docFreq=866, maxDocs=44218)
               0.0546875 = fieldNorm(doc=1283)
         0.07264897 = weight(abstract_txt:context in 1283) [ClassicSimilarity], result of:
           0.07264897 = score(doc=1283,freq=4.0), product of:
             0.15304698 = queryWeight, product of:
               2.8479917 = boost
               4.339969 = idf(docFreq=1566, maxDocs=44218)
               0.012382246 = queryNorm
             0.47468412 = fieldWeight in 1283, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               4.339969 = idf(docFreq=1566, maxDocs=44218)
               0.0546875 = fieldNorm(doc=1283)
         0.22256413 = weight(abstract_txt:term in 1283) [ClassicSimilarity], result of:
           0.22256413 = score(doc=1283,freq=8.0), product of:
             0.29968977 = queryWeight, product of:
               5.0410647 = boost
               4.8012047 = idf(docFreq=987, maxDocs=44218)
               0.012382246 = queryNorm
             0.7426484 = fieldWeight in 1283, product of:
               2.828427 = tf(freq=8.0), with freq of:
                 8.0 = termFreq=8.0
               4.8012047 = idf(docFreq=987, maxDocs=44218)
               0.0546875 = fieldNorm(doc=1283)
         0.6039727 = weight(abstract_txt:weights in 1283) [ClassicSimilarity], result of:
           0.6039727 = score(doc=1283,freq=5.0), product of:
             0.6819512 = queryWeight, product of:
               7.6043653 = boost
               7.24254 = idf(docFreq=85, maxDocs=44218)
               0.012382246 = queryNorm
             0.88565373 = fieldWeight in 1283, product of:
               2.236068 = tf(freq=5.0), with freq of:
                 5.0 = termFreq=5.0
               7.24254 = idf(docFreq=85, maxDocs=44218)
               0.0546875 = fieldNorm(doc=1283)
       0.6 = coord(15/25)
   

2. Dang, E.K.F.; Luk, R.W.P.; Allan, J.: ¬A context-dependent relevance model (2016) 0.43

   0.4331675 = sum of:
     0.4331675 = product of:
       0.7735134 = sum of:
         0.046512567 = weight(abstract_txt:window in 2778) [ClassicSimilarity], result of:
           0.046512567 = score(doc=2778,freq=1.0), product of:
             0.09655039 = queryWeight, product of:
               1.0116222 = boost
               7.7079034 = idf(docFreq=53, maxDocs=44218)
               0.012382246 = queryNorm
             0.48174396 = fieldWeight in 2778, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.7079034 = idf(docFreq=53, maxDocs=44218)
               0.0625 = fieldNorm(doc=2778)
         0.018997524 = weight(abstract_txt:terms in 2778) [ClassicSimilarity], result of:
           0.018997524 = score(doc=2778,freq=2.0), product of:
             0.05315023 = queryWeight, product of:
               1.0614729 = boost
               4.0438666 = idf(docFreq=2106, maxDocs=44218)
               0.012382246 = queryNorm
             0.3574307 = fieldWeight in 2778, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               4.0438666 = idf(docFreq=2106, maxDocs=44218)
               0.0625 = fieldNorm(doc=2778)
         0.015533401 = weight(abstract_txt:over in 2778) [ClassicSimilarity], result of:
           0.015533401 = score(doc=2778,freq=1.0), product of:
             0.058554668 = queryWeight, product of:
               1.1141331 = boost
               4.244485 = idf(docFreq=1723, maxDocs=44218)
               0.012382246 = queryNorm
             0.2652803 = fieldWeight in 2778, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.244485 = idf(docFreq=1723, maxDocs=44218)
               0.0625 = fieldNorm(doc=2778)
         0.006346037 = weight(abstract_txt:with in 2778) [ClassicSimilarity], result of:
           0.006346037 = score(doc=2778,freq=1.0), product of:
             0.040618967 = queryWeight, product of:
               1.312308 = boost
               2.4997334 = idf(docFreq=9868, maxDocs=44218)
               0.012382246 = queryNorm
             0.15623334 = fieldWeight in 2778, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               2.4997334 = idf(docFreq=9868, maxDocs=44218)
               0.0625 = fieldNorm(doc=2778)
         0.03807173 = weight(abstract_txt:effectiveness in 2778) [ClassicSimilarity], result of:
           0.03807173 = score(doc=2778,freq=2.0), product of:
             0.08448421 = queryWeight, product of:
               1.3382711 = boost
               5.098378 = idf(docFreq=733, maxDocs=44218)
               0.012382246 = queryNorm
             0.45063722 = fieldWeight in 2778, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               5.098378 = idf(docFreq=733, maxDocs=44218)
               0.0625 = fieldNorm(doc=2778)
         0.047291055 = weight(abstract_txt:improvement in 2778) [ClassicSimilarity], result of:
           0.047291055 = score(doc=2778,freq=1.0), product of:
             0.122999445 = queryWeight, product of:
               1.6147597 = boost
               6.1517096 = idf(docFreq=255, maxDocs=44218)
               0.012382246 = queryNorm
             0.38448185 = fieldWeight in 2778, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.1517096 = idf(docFreq=255, maxDocs=44218)
               0.0625 = fieldNorm(doc=2778)
         0.03408486 = weight(abstract_txt:document in 2778) [ClassicSimilarity], result of:
           0.03408486 = score(doc=2778,freq=2.0), product of:
             0.089834936 = queryWeight, product of:
               1.6901474 = boost
               4.2926083 = idf(docFreq=1642, maxDocs=44218)
               0.012382246 = queryNorm
             0.37941656 = fieldWeight in 2778, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               4.2926083 = idf(docFreq=1642, maxDocs=44218)
               0.0625 = fieldNorm(doc=2778)
         0.016874215 = weight(abstract_txt:using in 2778) [ClassicSimilarity], result of:
           0.016874215 = score(doc=2778,freq=1.0), product of:
             0.07796078 = queryWeight, product of:
               1.818065 = boost
               3.4631186 = idf(docFreq=3765, maxDocs=44218)
               0.012382246 = queryNorm
             0.21644491 = fieldWeight in 2778, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.4631186 = idf(docFreq=3765, maxDocs=44218)
               0.0625 = fieldNorm(doc=2778)
         0.03151103 = weight(abstract_txt:collections in 2778) [ClassicSimilarity], result of:
           0.03151103 = score(doc=2778,freq=1.0), product of:
             0.107412785 = queryWeight, product of:
               1.848119 = boost
               4.693822 = idf(docFreq=1099, maxDocs=44218)
               0.012382246 = queryNorm
             0.29336387 = fieldWeight in 2778, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.693822 = idf(docFreq=1099, maxDocs=44218)
               0.0625 = fieldNorm(doc=2778)
         0.14753737 = weight(abstract_txt:bm25 in 2778) [ClassicSimilarity], result of:
           0.14753737 = score(doc=2778,freq=1.0), product of:
             0.26261437 = queryWeight, product of:
               2.359476 = boost
               8.988837 = idf(docFreq=14, maxDocs=44218)
               0.012382246 = queryNorm
             0.5618023 = fieldWeight in 2778, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               8.988837 = idf(docFreq=14, maxDocs=44218)
               0.0625 = fieldNorm(doc=2778)
         0.08001138 = weight(abstract_txt:dependent in 2778) [ClassicSimilarity], result of:
           0.08001138 = score(doc=2778,freq=1.0), product of:
             0.19991656 = queryWeight, product of:
               2.5213106 = boost
               6.4035826 = idf(docFreq=198, maxDocs=44218)
               0.012382246 = queryNorm
             0.4002239 = fieldWeight in 2778, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.4035826 = idf(docFreq=198, maxDocs=44218)
               0.0625 = fieldNorm(doc=2778)
         0.10897718 = weight(abstract_txt:relevance in 2778) [ClassicSimilarity], result of:
           0.10897718 = score(doc=2778,freq=5.0), product of:
             0.15811056 = queryWeight, product of:
               2.5891175 = boost
               4.931848 = idf(docFreq=866, maxDocs=44218)
               0.012382246 = queryNorm
             0.6892467 = fieldWeight in 2778, product of:
               2.236068 = tf(freq=5.0), with freq of:
                 5.0 = termFreq=5.0
               4.931848 = idf(docFreq=866, maxDocs=44218)
               0.0625 = fieldNorm(doc=2778)
         0.09873757 = weight(abstract_txt:baseline in 2778) [ClassicSimilarity], result of:
           0.09873757 = score(doc=2778,freq=1.0), product of:
             0.23000424 = queryWeight, product of:
               2.7043934 = boost
               6.8685737 = idf(docFreq=124, maxDocs=44218)
               0.012382246 = queryNorm
             0.42928585 = fieldWeight in 2778, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.8685737 = idf(docFreq=124, maxDocs=44218)
               0.0625 = fieldNorm(doc=2778)
         0.0830274 = weight(abstract_txt:context in 2778) [ClassicSimilarity], result of:
           0.0830274 = score(doc=2778,freq=4.0), product of:
             0.15304698 = queryWeight, product of:
               2.8479917 = boost
               4.339969 = idf(docFreq=1566, maxDocs=44218)
               0.012382246 = queryNorm
             0.54249614 = fieldWeight in 2778, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               4.339969 = idf(docFreq=1566, maxDocs=44218)
               0.0625 = fieldNorm(doc=2778)
       0.56 = coord(14/25)
   

3. Trotman, A.: Choosing document structure weights (2005) 0.41

   0.40958092 = sum of:
     0.40958092 = product of:
       1.2799404 = sum of:
         0.016791597 = weight(abstract_txt:terms in 1016) [ClassicSimilarity], result of:
           0.016791597 = score(doc=1016,freq=1.0), product of:
             0.05315023 = queryWeight, product of:
               1.0614729 = boost
               4.0438666 = idf(docFreq=2106, maxDocs=44218)
               0.012382246 = queryNorm
             0.3159271 = fieldWeight in 1016, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.0438666 = idf(docFreq=2106, maxDocs=44218)
               0.078125 = fieldNorm(doc=1016)
         0.01941675 = weight(abstract_txt:over in 1016) [ClassicSimilarity], result of:
           0.01941675 = score(doc=1016,freq=1.0), product of:
             0.058554668 = queryWeight, product of:
               1.1141331 = boost
               4.244485 = idf(docFreq=1723, maxDocs=44218)
               0.012382246 = queryNorm
             0.33160037 = fieldWeight in 1016, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.244485 = idf(docFreq=1723, maxDocs=44218)
               0.078125 = fieldNorm(doc=1016)
         0.08359956 = weight(abstract_txt:improvement in 1016) [ClassicSimilarity], result of:
           0.08359956 = score(doc=1016,freq=2.0), product of:
             0.122999445 = queryWeight, product of:
               1.6147597 = boost
               6.1517096 = idf(docFreq=255, maxDocs=44218)
               0.012382246 = queryNorm
             0.67967427 = fieldWeight in 1016, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               6.1517096 = idf(docFreq=255, maxDocs=44218)
               0.078125 = fieldNorm(doc=1016)
         0.030127047 = weight(abstract_txt:document in 1016) [ClassicSimilarity], result of:
           0.030127047 = score(doc=1016,freq=1.0), product of:
             0.089834936 = queryWeight, product of:
               1.6901474 = boost
               4.2926083 = idf(docFreq=1642, maxDocs=44218)
               0.012382246 = queryNorm
             0.33536002 = fieldWeight in 1016, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.2926083 = idf(docFreq=1642, maxDocs=44218)
               0.078125 = fieldNorm(doc=1016)
         0.029829677 = weight(abstract_txt:using in 1016) [ClassicSimilarity], result of:
           0.029829677 = score(doc=1016,freq=2.0), product of:
             0.07796078 = queryWeight, product of:
               1.818065 = boost
               3.4631186 = idf(docFreq=3765, maxDocs=44218)
               0.012382246 = queryNorm
             0.38262415 = fieldWeight in 1016, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               3.4631186 = idf(docFreq=3765, maxDocs=44218)
               0.078125 = fieldNorm(doc=1016)
         0.31942776 = weight(abstract_txt:bm25 in 1016) [ClassicSimilarity], result of:
           0.31942776 = score(doc=1016,freq=3.0), product of:
             0.26261437 = queryWeight, product of:
               2.359476 = boost
               8.988837 = idf(docFreq=14, maxDocs=44218)
               0.012382246 = queryNorm
             1.2163377 = fieldWeight in 1016, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               8.988837 = idf(docFreq=14, maxDocs=44218)
               0.078125 = fieldNorm(doc=1016)
         0.11241187 = weight(abstract_txt:term in 1016) [ClassicSimilarity], result of:
           0.11241187 = score(doc=1016,freq=1.0), product of:
             0.29968977 = queryWeight, product of:
               5.0410647 = boost
               4.8012047 = idf(docFreq=987, maxDocs=44218)
               0.012382246 = queryNorm
             0.37509412 = fieldWeight in 1016, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.8012047 = idf(docFreq=987, maxDocs=44218)
               0.078125 = fieldNorm(doc=1016)
         0.66833603 = weight(abstract_txt:weights in 1016) [ClassicSimilarity], result of:
           0.66833603 = score(doc=1016,freq=3.0), product of:
             0.6819512 = queryWeight, product of:
               7.6043653 = boost
               7.24254 = idf(docFreq=85, maxDocs=44218)
               0.012382246 = queryNorm
             0.98003495 = fieldWeight in 1016, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               7.24254 = idf(docFreq=85, maxDocs=44218)
               0.078125 = fieldNorm(doc=1016)
       0.32 = coord(8/25)
   

4. Ruthven, I.; Lalmas, M.; Rijsbergen, K. van: Combining and selecting characteristics of information use (2002) 0.35

   0.3491614 = sum of:
     0.3491614 = product of:
       0.72741956 = sum of:
         0.034635883 = weight(abstract_txt:inverse in 5208) [ClassicSimilarity], result of:
           0.034635883 = score(doc=5208,freq=1.0), product of:
             0.09609124 = queryWeight, product of:
               1.0092139 = boost
               7.689554 = idf(docFreq=54, maxDocs=44218)
               0.012382246 = queryNorm
             0.36044785 = fieldWeight in 5208, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.689554 = idf(docFreq=54, maxDocs=44218)
               0.046875 = fieldNorm(doc=5208)
         0.020149915 = weight(abstract_txt:terms in 5208) [ClassicSimilarity], result of:
           0.020149915 = score(doc=5208,freq=4.0), product of:
             0.05315023 = queryWeight, product of:
               1.0614729 = boost
               4.0438666 = idf(docFreq=2106, maxDocs=44218)
               0.012382246 = queryNorm
             0.37911248 = fieldWeight in 5208, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               4.0438666 = idf(docFreq=2106, maxDocs=44218)
               0.046875 = fieldNorm(doc=5208)
         0.016475659 = weight(abstract_txt:over in 5208) [ClassicSimilarity], result of:
           0.016475659 = score(doc=5208,freq=2.0), product of:
             0.058554668 = queryWeight, product of:
               1.1141331 = boost
               4.244485 = idf(docFreq=1723, maxDocs=44218)
               0.012382246 = queryNorm
             0.28137225 = fieldWeight in 5208, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               4.244485 = idf(docFreq=1723, maxDocs=44218)
               0.046875 = fieldNorm(doc=5208)
         0.010642628 = weight(abstract_txt:with in 5208) [ClassicSimilarity], result of:
           0.010642628 = score(doc=5208,freq=5.0), product of:
             0.040618967 = queryWeight, product of:
               1.312308 = boost
               2.4997334 = idf(docFreq=9868, maxDocs=44218)
               0.012382246 = queryNorm
             0.2620113 = fieldWeight in 5208, product of:
               2.236068 = tf(freq=5.0), with freq of:
                 5.0 = termFreq=5.0
               2.4997334 = idf(docFreq=9868, maxDocs=44218)
               0.046875 = fieldNorm(doc=5208)
         0.055515658 = weight(abstract_txt:frequency in 5208) [ClassicSimilarity], result of:
           0.055515658 = score(doc=5208,freq=3.0), product of:
             0.11496868 = queryWeight, product of:
               1.5611552 = boost
               5.947494 = idf(docFreq=313, maxDocs=44218)
               0.012382246 = queryNorm
             0.48287636 = fieldWeight in 5208, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               5.947494 = idf(docFreq=313, maxDocs=44218)
               0.046875 = fieldNorm(doc=5208)
         0.051127292 = weight(abstract_txt:document in 5208) [ClassicSimilarity], result of:
           0.051127292 = score(doc=5208,freq=8.0), product of:
             0.089834936 = queryWeight, product of:
               1.6901474 = boost
               4.2926083 = idf(docFreq=1642, maxDocs=44218)
               0.012382246 = queryNorm
             0.5691248 = fieldWeight in 5208, product of:
               2.828427 = tf(freq=8.0), with freq of:
                 8.0 = termFreq=8.0
               4.2926083 = idf(docFreq=1642, maxDocs=44218)
               0.046875 = fieldNorm(doc=5208)
         0.0126556605 = weight(abstract_txt:using in 5208) [ClassicSimilarity], result of:
           0.0126556605 = score(doc=5208,freq=1.0), product of:
             0.07796078 = queryWeight, product of:
               1.818065 = boost
               3.4631186 = idf(docFreq=3765, maxDocs=44218)
               0.012382246 = queryNorm
             0.16233368 = fieldWeight in 5208, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.4631186 = idf(docFreq=3765, maxDocs=44218)
               0.046875 = fieldNorm(doc=5208)
         0.033422496 = weight(abstract_txt:collections in 5208) [ClassicSimilarity], result of:
           0.033422496 = score(doc=5208,freq=2.0), product of:
             0.107412785 = queryWeight, product of:
               1.848119 = boost
               4.693822 = idf(docFreq=1099, maxDocs=44218)
               0.012382246 = queryNorm
             0.31115937 = fieldWeight in 5208, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               4.693822 = idf(docFreq=1099, maxDocs=44218)
               0.046875 = fieldNorm(doc=5208)
         0.051692415 = weight(abstract_txt:relevance in 5208) [ClassicSimilarity], result of:
           0.051692415 = score(doc=5208,freq=2.0), product of:
             0.15811056 = queryWeight, product of:
               2.5891175 = boost
               4.931848 = idf(docFreq=866, maxDocs=44218)
               0.012382246 = queryNorm
             0.32693842 = fieldWeight in 5208, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               4.931848 = idf(docFreq=866, maxDocs=44218)
               0.046875 = fieldNorm(doc=5208)
         0.031135272 = weight(abstract_txt:context in 5208) [ClassicSimilarity], result of:
           0.031135272 = score(doc=5208,freq=1.0), product of:
             0.15304698 = queryWeight, product of:
               2.8479917 = boost
               4.339969 = idf(docFreq=1566, maxDocs=44218)
               0.012382246 = queryNorm
             0.20343605 = fieldWeight in 5208, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.339969 = idf(docFreq=1566, maxDocs=44218)
               0.046875 = fieldNorm(doc=5208)
         0.1784483 = weight(abstract_txt:term in 5208) [ClassicSimilarity], result of:
           0.1784483 = score(doc=5208,freq=7.0), product of:
             0.29968977 = queryWeight, product of:
               5.0410647 = boost
               4.8012047 = idf(docFreq=987, maxDocs=44218)
               0.012382246 = queryNorm
             0.5954434 = fieldWeight in 5208, product of:
               2.6457512 = tf(freq=7.0), with freq of:
                 7.0 = termFreq=7.0
               4.8012047 = idf(docFreq=987, maxDocs=44218)
               0.046875 = fieldNorm(doc=5208)
         0.23151839 = weight(abstract_txt:weights in 5208) [ClassicSimilarity], result of:
           0.23151839 = score(doc=5208,freq=1.0), product of:
             0.6819512 = queryWeight, product of:
               7.6043653 = boost
               7.24254 = idf(docFreq=85, maxDocs=44218)
               0.012382246 = queryNorm
             0.33949405 = fieldWeight in 5208, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.24254 = idf(docFreq=85, maxDocs=44218)
               0.046875 = fieldNorm(doc=5208)
       0.48 = coord(12/25)
   

5. Moura, E.S. de; Fernandes, D.; Ribeiro-Neto, B.; Silva, A.S. da; Gonçalves, M.A.: Using structural information to improve search in Web collections (2010) 0.29

   0.2863731 = sum of:
     0.2863731 = product of:
       0.79548085 = sum of:
         0.056925777 = weight(abstract_txt:compute in 4119) [ClassicSimilarity], result of:
           0.056925777 = score(doc=4119,freq=1.0), product of:
             0.09520062 = queryWeight, product of:
               1.0045261 = boost
               7.653836 = idf(docFreq=56, maxDocs=44218)
               0.012382246 = queryNorm
             0.59795594 = fieldWeight in 4119, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.653836 = idf(docFreq=56, maxDocs=44218)
               0.078125 = fieldNorm(doc=4119)
         0.057726465 = weight(abstract_txt:inverse in 4119) [ClassicSimilarity], result of:
           0.057726465 = score(doc=4119,freq=1.0), product of:
             0.09609124 = queryWeight, product of:
               1.0092139 = boost
               7.689554 = idf(docFreq=54, maxDocs=44218)
               0.012382246 = queryNorm
             0.6007464 = fieldWeight in 4119, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.689554 = idf(docFreq=54, maxDocs=44218)
               0.078125 = fieldNorm(doc=4119)
         0.011218315 = weight(abstract_txt:with in 4119) [ClassicSimilarity], result of:
           0.011218315 = score(doc=4119,freq=2.0), product of:
             0.040618967 = queryWeight, product of:
               1.312308 = boost
               2.4997334 = idf(docFreq=9868, maxDocs=44218)
               0.012382246 = queryNorm
             0.27618414 = fieldWeight in 4119, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               2.4997334 = idf(docFreq=9868, maxDocs=44218)
               0.078125 = fieldNorm(doc=4119)
         0.07554724 = weight(abstract_txt:frequency in 4119) [ClassicSimilarity], result of:
           0.07554724 = score(doc=4119,freq=2.0), product of:
             0.11496868 = queryWeight, product of:
               1.5611552 = boost
               5.947494 = idf(docFreq=313, maxDocs=44218)
               0.012382246 = queryNorm
             0.65711147 = fieldWeight in 4119, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               5.947494 = idf(docFreq=313, maxDocs=44218)
               0.078125 = fieldNorm(doc=4119)
         0.030127047 = weight(abstract_txt:document in 4119) [ClassicSimilarity], result of:
           0.030127047 = score(doc=4119,freq=1.0), product of:
             0.089834936 = queryWeight, product of:
               1.6901474 = boost
               4.2926083 = idf(docFreq=1642, maxDocs=44218)
               0.012382246 = queryNorm
             0.33536002 = fieldWeight in 4119, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.2926083 = idf(docFreq=1642, maxDocs=44218)
               0.078125 = fieldNorm(doc=4119)
         0.029829677 = weight(abstract_txt:using in 4119) [ClassicSimilarity], result of:
           0.029829677 = score(doc=4119,freq=2.0), product of:
             0.07796078 = queryWeight, product of:
               1.818065 = boost
               3.4631186 = idf(docFreq=3765, maxDocs=44218)
               0.012382246 = queryNorm
             0.38262415 = fieldWeight in 4119, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               3.4631186 = idf(docFreq=3765, maxDocs=44218)
               0.078125 = fieldNorm(doc=4119)
         0.055704154 = weight(abstract_txt:collections in 4119) [ClassicSimilarity], result of:
           0.055704154 = score(doc=4119,freq=2.0), product of:
             0.107412785 = queryWeight, product of:
               1.848119 = boost
               4.693822 = idf(docFreq=1099, maxDocs=44218)
               0.012382246 = queryNorm
             0.5185989 = fieldWeight in 4119, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               4.693822 = idf(docFreq=1099, maxDocs=44218)
               0.078125 = fieldNorm(doc=4119)
         0.31942776 = weight(abstract_txt:bm25 in 4119) [ClassicSimilarity], result of:
           0.31942776 = score(doc=4119,freq=3.0), product of:
             0.26261437 = queryWeight, product of:
               2.359476 = boost
               8.988837 = idf(docFreq=14, maxDocs=44218)
               0.012382246 = queryNorm
             1.2163377 = fieldWeight in 4119, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               8.988837 = idf(docFreq=14, maxDocs=44218)
               0.078125 = fieldNorm(doc=4119)
         0.15897438 = weight(abstract_txt:term in 4119) [ClassicSimilarity], result of:
           0.15897438 = score(doc=4119,freq=2.0), product of:
             0.29968977 = queryWeight, product of:
               5.0410647 = boost
               4.8012047 = idf(docFreq=987, maxDocs=44218)
               0.012382246 = queryNorm
             0.53046316 = fieldWeight in 4119, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               4.8012047 = idf(docFreq=987, maxDocs=44218)
               0.078125 = fieldNorm(doc=4119)
       0.36 = coord(9/25)