Document (#34713)

Author

Yeganova, L.
Comeau, D.C.
Kim, W.
Wilbur, W.J.

Title

How to interpret PubMed queries and why it matters

Source

Journal of the American Society for Information Science and Technology. 60(2009) no.2, S.264-274

Year

2009

Abstract

A significant fraction of queries in PubMed(TM) are multiterm queries without parsing instructions. Generally, search engines interpret such queries as collections of terms, and handle them as a Boolean conjunction of these terms. However, analysis of queries in PubMed(TM) indicates that many such queries are meaningful phrases, rather than simple collections of terms. In this study, we examine whether or not it makes a difference, in terms of retrieval quality, if such queries are interpreted as a phrase or as a conjunction of query terms. And, if it does, what is the optimal way of searching with such queries. To address the question, we developed an automated retrieval evaluation method, based on machine learning techniques, that enables us to evaluate and compare various retrieval outcomes. We show that the class of records that contain all the search terms, but not the phrase, qualitatively differs from the class of records containing the phrase. We also show that the difference is systematic, depending on the proximity of query terms to each other within the record. Based on these results, one can establish the best retrieval order for the records. Our findings are consistent with studies in proximity searching.

Field

Medizin

Object

PubMed

Similar documents (author)

1. Wilbur, W.J.: Global term weights for document retrieval learned from TREC data (2001) 5.62

   5.620886 = sum of:
     5.620886 = weight(author_txt:wilbur in 2646) [ClassicSimilarity], result of:
       5.620886 = fieldWeight in 2646, product of:
         1.0 = tf(freq=1.0), with freq of:
           1.0 = termFreq=1.0
         8.993418 = idf(docFreq=14, maxDocs=44421)
         0.625 = fieldNorm(doc=2646)
   

2. Wilbur, W.J.: Human subjectivity and performance limits in document retrieval (1996) 5.62

   5.620886 = sum of:
     5.620886 = weight(author_txt:wilbur in 6675) [ClassicSimilarity], result of:
       5.620886 = fieldWeight in 6675, product of:
         1.0 = tf(freq=1.0), with freq of:
           1.0 = termFreq=1.0
         8.993418 = idf(docFreq=14, maxDocs=44421)
         0.625 = fieldNorm(doc=6675)
   

3. Wilbur, W.J.: ¬A comparison of group and individual performance among subject experts and untrained workers at the document retrieval task (1998) 5.62

   5.620886 = sum of:
     5.620886 = weight(author_txt:wilbur in 4263) [ClassicSimilarity], result of:
       5.620886 = fieldWeight in 4263, product of:
         1.0 = tf(freq=1.0), with freq of:
           1.0 = termFreq=1.0
         8.993418 = idf(docFreq=14, maxDocs=44421)
         0.625 = fieldNorm(doc=4263)
   

4. Wilbur, W.J.: Human subjectivity and performance limits in document retrieval (1999) 5.62

   5.620886 = sum of:
     5.620886 = weight(author_txt:wilbur in 5539) [ClassicSimilarity], result of:
       5.620886 = fieldWeight in 5539, product of:
         1.0 = tf(freq=1.0), with freq of:
           1.0 = termFreq=1.0
         8.993418 = idf(docFreq=14, maxDocs=44421)
         0.625 = fieldNorm(doc=5539)
   

5. Wilbur, W.J.: ¬A retrieval system based on automatic relevance weighting of search terms (1992) 5.62

   5.620886 = sum of:
     5.620886 = weight(author_txt:wilbur in 6269) [ClassicSimilarity], result of:
       5.620886 = fieldWeight in 6269, product of:
         1.0 = tf(freq=1.0), with freq of:
           1.0 = termFreq=1.0
         8.993418 = idf(docFreq=14, maxDocs=44421)
         0.625 = fieldNorm(doc=6269)
   

Similar documents (content)

1. Sarigil, E.; Sengor Altingovde, I.; Blanco, R.; Barla Cambazoglu, B.; Ozcan, R.; Ulusoy, Ö.: Characterizing, predicting, and handling web search queries that match very few or no results (2018) 0.29

   0.28972402 = sum of:
     0.28972402 = product of:
       0.80478895 = sum of:
         0.027695818 = weight(abstract_txt:search in 39) [ClassicSimilarity], result of:
           0.027695818 = score(doc=39,freq=4.0), product of:
             0.06062679 = queryWeight, product of:
               1.0467175 = boost
               3.654598 = idf(docFreq=3123, maxDocs=44421)
               0.015848767 = queryNorm
             0.45682475 = fieldWeight in 39, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               3.654598 = idf(docFreq=3123, maxDocs=44421)
               0.0625 = fieldNorm(doc=39)
         0.07668097 = weight(abstract_txt:fraction in 39) [ClassicSimilarity], result of:
           0.07668097 = score(doc=39,freq=1.0), product of:
             0.15061106 = queryWeight, product of:
               1.1665696 = boost
               8.146119 = idf(docFreq=34, maxDocs=44421)
               0.015848767 = queryNorm
             0.50913244 = fieldWeight in 39, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               8.146119 = idf(docFreq=34, maxDocs=44421)
               0.0625 = fieldNorm(doc=39)
         0.041886937 = weight(abstract_txt:show in 39) [ClassicSimilarity], result of:
           0.041886937 = score(doc=39,freq=3.0), product of:
             0.08791988 = queryWeight, product of:
               1.2604939 = boost
               4.400995 = idf(docFreq=1480, maxDocs=44421)
               0.015848767 = queryNorm
             0.47642165 = fieldWeight in 39, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               4.400995 = idf(docFreq=1480, maxDocs=44421)
               0.0625 = fieldNorm(doc=39)
         0.06818089 = weight(abstract_txt:query in 39) [ClassicSimilarity], result of:
           0.06818089 = score(doc=39,freq=5.0), product of:
             0.102610916 = queryWeight, product of:
               1.3617394 = boost
               4.754492 = idf(docFreq=1039, maxDocs=44421)
               0.015848767 = queryNorm
             0.6644604 = fieldWeight in 39, product of:
               2.236068 = tf(freq=5.0), with freq of:
                 5.0 = termFreq=5.0
               4.754492 = idf(docFreq=1039, maxDocs=44421)
               0.0625 = fieldNorm(doc=39)
         0.058158256 = weight(abstract_txt:class in 39) [ClassicSimilarity], result of:
           0.058158256 = score(doc=39,freq=1.0), product of:
             0.1578154 = queryWeight, product of:
               1.6887753 = boost
               5.8963327 = idf(docFreq=331, maxDocs=44421)
               0.015848767 = queryNorm
             0.3685208 = fieldWeight in 39, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.8963327 = idf(docFreq=331, maxDocs=44421)
               0.0625 = fieldNorm(doc=39)
         0.02482059 = weight(abstract_txt:that in 39) [ClassicSimilarity], result of:
           0.02482059 = score(doc=39,freq=7.0), product of:
             0.06346932 = queryWeight, product of:
               1.6933594 = boost
               2.3649352 = idf(docFreq=11344, maxDocs=44421)
               0.015848767 = queryNorm
             0.39106438 = fieldWeight in 39, product of:
               2.6457512 = tf(freq=7.0), with freq of:
                 7.0 = termFreq=7.0
               2.3649352 = idf(docFreq=11344, maxDocs=44421)
               0.0625 = fieldNorm(doc=39)
         0.04543478 = weight(abstract_txt:such in 39) [ClassicSimilarity], result of:
           0.04543478 = score(doc=39,freq=4.0), product of:
             0.10624881 = queryWeight, product of:
               1.9596307 = boost
               3.42101 = idf(docFreq=3945, maxDocs=44421)
               0.015848767 = queryNorm
             0.42762625 = fieldWeight in 39, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               3.42101 = idf(docFreq=3945, maxDocs=44421)
               0.0625 = fieldNorm(doc=39)
         0.092851534 = weight(abstract_txt:terms in 39) [ClassicSimilarity], result of:
           0.092851534 = score(doc=39,freq=2.0), product of:
             0.25978488 = queryWeight, product of:
               4.0535746 = boost
               4.043712 = idf(docFreq=2116, maxDocs=44421)
               0.015848767 = queryNorm
             0.35741702 = fieldWeight in 39, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               4.043712 = idf(docFreq=2116, maxDocs=44421)
               0.0625 = fieldNorm(doc=39)
         0.36907917 = weight(abstract_txt:queries in 39) [ClassicSimilarity], result of:
           0.36907917 = score(doc=39,freq=6.0), product of:
             0.4725608 = queryWeight, product of:
               5.844617 = boost
               5.1015973 = idf(docFreq=734, maxDocs=44421)
               0.015848767 = queryNorm
             0.78101945 = fieldWeight in 39, product of:
               2.4494898 = tf(freq=6.0), with freq of:
                 6.0 = termFreq=6.0
               5.1015973 = idf(docFreq=734, maxDocs=44421)
               0.0625 = fieldNorm(doc=39)
       0.36 = coord(9/25)
   

2. Lucas, W.; Topi, H.: Form and function : the impact of query term and operator usage on Web search results (2002) 0.28

   0.27738914 = sum of:
     0.27738914 = product of:
       0.77052534 = sum of:
         0.041543726 = weight(abstract_txt:search in 1198) [ClassicSimilarity], result of:
           0.041543726 = score(doc=1198,freq=9.0), product of:
             0.06062679 = queryWeight, product of:
               1.0467175 = boost
               3.654598 = idf(docFreq=3123, maxDocs=44421)
               0.015848767 = queryNorm
             0.6852371 = fieldWeight in 1198, product of:
               3.0 = tf(freq=9.0), with freq of:
                 9.0 = termFreq=9.0
               3.654598 = idf(docFreq=3123, maxDocs=44421)
               0.0625 = fieldNorm(doc=1198)
         0.024183434 = weight(abstract_txt:show in 1198) [ClassicSimilarity], result of:
           0.024183434 = score(doc=1198,freq=1.0), product of:
             0.08791988 = queryWeight, product of:
               1.2604939 = boost
               4.400995 = idf(docFreq=1480, maxDocs=44421)
               0.015848767 = queryNorm
             0.27506217 = fieldWeight in 1198, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.400995 = idf(docFreq=1480, maxDocs=44421)
               0.0625 = fieldNorm(doc=1198)
         0.030491423 = weight(abstract_txt:query in 1198) [ClassicSimilarity], result of:
           0.030491423 = score(doc=1198,freq=1.0), product of:
             0.102610916 = queryWeight, product of:
               1.3617394 = boost
               4.754492 = idf(docFreq=1039, maxDocs=44421)
               0.015848767 = queryNorm
             0.29715574 = fieldWeight in 1198, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.754492 = idf(docFreq=1039, maxDocs=44421)
               0.0625 = fieldNorm(doc=1198)
         0.018762603 = weight(abstract_txt:that in 1198) [ClassicSimilarity], result of:
           0.018762603 = score(doc=1198,freq=4.0), product of:
             0.06346932 = queryWeight, product of:
               1.6933594 = boost
               2.3649352 = idf(docFreq=11344, maxDocs=44421)
               0.015848767 = queryNorm
             0.2956169 = fieldWeight in 1198, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               2.3649352 = idf(docFreq=11344, maxDocs=44421)
               0.0625 = fieldNorm(doc=1198)
         0.06391196 = weight(abstract_txt:difference in 1198) [ClassicSimilarity], result of:
           0.06391196 = score(doc=1198,freq=1.0), product of:
             0.16805956 = queryWeight, product of:
               1.7427248 = boost
               6.0846963 = idf(docFreq=274, maxDocs=44421)
               0.015848767 = queryNorm
             0.38029352 = fieldWeight in 1198, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.0846963 = idf(docFreq=274, maxDocs=44421)
               0.0625 = fieldNorm(doc=1198)
         0.023840869 = weight(abstract_txt:retrieval in 1198) [ClassicSimilarity], result of:
           0.023840869 = score(doc=1198,freq=1.0), product of:
             0.109723546 = queryWeight, product of:
               1.9914166 = boost
               3.4765 = idf(docFreq=3732, maxDocs=44421)
               0.015848767 = queryNorm
             0.21728125 = fieldWeight in 1198, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.4765 = idf(docFreq=3732, maxDocs=44421)
               0.0625 = fieldNorm(doc=1198)
         0.15272003 = weight(abstract_txt:phrase in 1198) [ClassicSimilarity], result of:
           0.15272003 = score(doc=1198,freq=1.0), product of:
             0.3438504 = queryWeight, product of:
               3.0530055 = boost
               7.1063476 = idf(docFreq=98, maxDocs=44421)
               0.015848767 = queryNorm
             0.44414672 = fieldWeight in 1198, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.1063476 = idf(docFreq=98, maxDocs=44421)
               0.0625 = fieldNorm(doc=1198)
         0.11371945 = weight(abstract_txt:terms in 1198) [ClassicSimilarity], result of:
           0.11371945 = score(doc=1198,freq=3.0), product of:
             0.25978488 = queryWeight, product of:
               4.0535746 = boost
               4.043712 = idf(docFreq=2116, maxDocs=44421)
               0.015848767 = queryNorm
             0.43774468 = fieldWeight in 1198, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               4.043712 = idf(docFreq=2116, maxDocs=44421)
               0.0625 = fieldNorm(doc=1198)
         0.30135185 = weight(abstract_txt:queries in 1198) [ClassicSimilarity], result of:
           0.30135185 = score(doc=1198,freq=4.0), product of:
             0.4725608 = queryWeight, product of:
               5.844617 = boost
               5.1015973 = idf(docFreq=734, maxDocs=44421)
               0.015848767 = queryNorm
             0.63769966 = fieldWeight in 1198, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               5.1015973 = idf(docFreq=734, maxDocs=44421)
               0.0625 = fieldNorm(doc=1198)
       0.36 = coord(9/25)
   

3. Fattahi, R.; Wilson, C.S.; Cole, F.: ¬An alternative approach to natural language query expansion in search engines : text analysis of non-topical terms in Web documents (2008) 0.28

   0.27714476 = sum of:
     0.27714476 = product of:
       0.7698465 = sum of:
         0.03635076 = weight(abstract_txt:search in 3106) [ClassicSimilarity], result of:
           0.03635076 = score(doc=3106,freq=9.0), product of:
             0.06062679 = queryWeight, product of:
               1.0467175 = boost
               3.654598 = idf(docFreq=3123, maxDocs=44421)
               0.015848767 = queryNorm
             0.5995825 = fieldWeight in 3106, product of:
               3.0 = tf(freq=9.0), with freq of:
                 9.0 = termFreq=9.0
               3.654598 = idf(docFreq=3123, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3106)
         0.019548744 = weight(abstract_txt:searching in 3106) [ClassicSimilarity], result of:
           0.019548744 = score(doc=3106,freq=1.0), product of:
             0.083396725 = queryWeight, product of:
               1.2276419 = boost
               4.2862926 = idf(docFreq=1660, maxDocs=44421)
               0.015848767 = queryNorm
             0.23440662 = fieldWeight in 3106, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.2862926 = idf(docFreq=1660, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3106)
         0.053359985 = weight(abstract_txt:query in 3106) [ClassicSimilarity], result of:
           0.053359985 = score(doc=3106,freq=4.0), product of:
             0.102610916 = queryWeight, product of:
               1.3617394 = boost
               4.754492 = idf(docFreq=1039, maxDocs=44421)
               0.015848767 = queryNorm
             0.5200225 = fieldWeight in 3106, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               4.754492 = idf(docFreq=1039, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3106)
         0.011608768 = weight(abstract_txt:that in 3106) [ClassicSimilarity], result of:
           0.011608768 = score(doc=3106,freq=2.0), product of:
             0.06346932 = queryWeight, product of:
               1.6933594 = boost
               2.3649352 = idf(docFreq=11344, maxDocs=44421)
               0.015848767 = queryNorm
             0.18290362 = fieldWeight in 3106, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               2.3649352 = idf(docFreq=11344, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3106)
         0.020860761 = weight(abstract_txt:retrieval in 3106) [ClassicSimilarity], result of:
           0.020860761 = score(doc=3106,freq=1.0), product of:
             0.109723546 = queryWeight, product of:
               1.9914166 = boost
               3.4765 = idf(docFreq=3732, maxDocs=44421)
               0.015848767 = queryNorm
             0.1901211 = fieldWeight in 3106, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.4765 = idf(docFreq=3732, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3106)
         0.095882125 = weight(abstract_txt:conjunction in 3106) [ClassicSimilarity], result of:
           0.095882125 = score(doc=3106,freq=1.0), product of:
             0.24074735 = queryWeight, product of:
               2.0858254 = boost
               7.282627 = idf(docFreq=82, maxDocs=44421)
               0.015848767 = queryNorm
             0.39826867 = fieldWeight in 3106, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.282627 = idf(docFreq=82, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3106)
         0.1889814 = weight(abstract_txt:phrase in 3106) [ClassicSimilarity], result of:
           0.1889814 = score(doc=3106,freq=2.0), product of:
             0.3438504 = queryWeight, product of:
               3.0530055 = boost
               7.1063476 = idf(docFreq=98, maxDocs=44421)
               0.015848767 = queryNorm
             0.5496035 = fieldWeight in 3106, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               7.1063476 = idf(docFreq=98, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3106)
         0.114897914 = weight(abstract_txt:terms in 3106) [ClassicSimilarity], result of:
           0.114897914 = score(doc=3106,freq=4.0), product of:
             0.25978488 = queryWeight, product of:
               4.0535746 = boost
               4.043712 = idf(docFreq=2116, maxDocs=44421)
               0.015848767 = queryNorm
             0.442281 = fieldWeight in 3106, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               4.043712 = idf(docFreq=2116, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3106)
         0.22835606 = weight(abstract_txt:queries in 3106) [ClassicSimilarity], result of:
           0.22835606 = score(doc=3106,freq=3.0), product of:
             0.4725608 = queryWeight, product of:
               5.844617 = boost
               5.1015973 = idf(docFreq=734, maxDocs=44421)
               0.015848767 = queryNorm
             0.48323107 = fieldWeight in 3106, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               5.1015973 = idf(docFreq=734, maxDocs=44421)
               0.0546875 = fieldNorm(doc=3106)
       0.36 = coord(9/25)
   

4. Brandão, W.C.; Santos, R.L.T.; Ziviani, N.; Moura, E.S. de; Silva, A.S. da: Learning to expand queries using entities (2014) 0.27

   0.26636067 = sum of:
     0.26636067 = product of:
       0.66590166 = sum of:
         0.013847909 = weight(abstract_txt:search in 2343) [ClassicSimilarity], result of:
           0.013847909 = score(doc=2343,freq=1.0), product of:
             0.06062679 = queryWeight, product of:
               1.0467175 = boost
               3.654598 = idf(docFreq=3123, maxDocs=44421)
               0.015848767 = queryNorm
             0.22841237 = fieldWeight in 2343, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.654598 = idf(docFreq=3123, maxDocs=44421)
               0.0625 = fieldNorm(doc=2343)
         0.07668097 = weight(abstract_txt:fraction in 2343) [ClassicSimilarity], result of:
           0.07668097 = score(doc=2343,freq=1.0), product of:
             0.15061106 = queryWeight, product of:
               1.1665696 = boost
               8.146119 = idf(docFreq=34, maxDocs=44421)
               0.015848767 = queryNorm
             0.50913244 = fieldWeight in 2343, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               8.146119 = idf(docFreq=34, maxDocs=44421)
               0.0625 = fieldNorm(doc=2343)
         0.029407896 = weight(abstract_txt:collections in 2343) [ClassicSimilarity], result of:
           0.029407896 = score(doc=2343,freq=1.0), product of:
             0.100165404 = queryWeight, product of:
               1.3454144 = boost
               4.6974936 = idf(docFreq=1100, maxDocs=44421)
               0.015848767 = queryNorm
             0.29359335 = fieldWeight in 2343, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.6974936 = idf(docFreq=1100, maxDocs=44421)
               0.0625 = fieldNorm(doc=2343)
         0.06818089 = weight(abstract_txt:query in 2343) [ClassicSimilarity], result of:
           0.06818089 = score(doc=2343,freq=5.0), product of:
             0.102610916 = queryWeight, product of:
               1.3617394 = boost
               4.754492 = idf(docFreq=1039, maxDocs=44421)
               0.015848767 = queryNorm
             0.6644604 = fieldWeight in 2343, product of:
               2.236068 = tf(freq=5.0), with freq of:
                 5.0 = termFreq=5.0
               4.754492 = idf(docFreq=1039, maxDocs=44421)
               0.0625 = fieldNorm(doc=2343)
         0.013267164 = weight(abstract_txt:that in 2343) [ClassicSimilarity], result of:
           0.013267164 = score(doc=2343,freq=2.0), product of:
             0.06346932 = queryWeight, product of:
               1.6933594 = boost
               2.3649352 = idf(docFreq=11344, maxDocs=44421)
               0.015848767 = queryNorm
             0.20903271 = fieldWeight in 2343, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               2.3649352 = idf(docFreq=11344, maxDocs=44421)
               0.0625 = fieldNorm(doc=2343)
         0.02271739 = weight(abstract_txt:such in 2343) [ClassicSimilarity], result of:
           0.02271739 = score(doc=2343,freq=1.0), product of:
             0.10624881 = queryWeight, product of:
               1.9596307 = boost
               3.42101 = idf(docFreq=3945, maxDocs=44421)
               0.015848767 = queryNorm
             0.21381313 = fieldWeight in 2343, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.42101 = idf(docFreq=3945, maxDocs=44421)
               0.0625 = fieldNorm(doc=2343)
         0.023840869 = weight(abstract_txt:retrieval in 2343) [ClassicSimilarity], result of:
           0.023840869 = score(doc=2343,freq=1.0), product of:
             0.109723546 = queryWeight, product of:
               1.9914166 = boost
               3.4765 = idf(docFreq=3732, maxDocs=44421)
               0.015848767 = queryNorm
             0.21728125 = fieldWeight in 2343, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.4765 = idf(docFreq=3732, maxDocs=44421)
               0.0625 = fieldNorm(doc=2343)
         0.10645906 = weight(abstract_txt:proximity in 2343) [ClassicSimilarity], result of:
           0.10645906 = score(doc=2343,freq=1.0), product of:
             0.23615484 = queryWeight, product of:
               2.065835 = boost
               7.212831 = idf(docFreq=88, maxDocs=44421)
               0.015848767 = queryNorm
             0.45080194 = fieldWeight in 2343, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.212831 = idf(docFreq=88, maxDocs=44421)
               0.0625 = fieldNorm(doc=2343)
         0.1608236 = weight(abstract_txt:terms in 2343) [ClassicSimilarity], result of:
           0.1608236 = score(doc=2343,freq=6.0), product of:
             0.25978488 = queryWeight, product of:
               4.0535746 = boost
               4.043712 = idf(docFreq=2116, maxDocs=44421)
               0.015848767 = queryNorm
             0.6190645 = fieldWeight in 2343, product of:
               2.4494898 = tf(freq=6.0), with freq of:
                 6.0 = termFreq=6.0
               4.043712 = idf(docFreq=2116, maxDocs=44421)
               0.0625 = fieldNorm(doc=2343)
         0.15067592 = weight(abstract_txt:queries in 2343) [ClassicSimilarity], result of:
           0.15067592 = score(doc=2343,freq=1.0), product of:
             0.4725608 = queryWeight, product of:
               5.844617 = boost
               5.1015973 = idf(docFreq=734, maxDocs=44421)
               0.015848767 = queryNorm
             0.31884983 = fieldWeight in 2343, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.1015973 = idf(docFreq=734, maxDocs=44421)
               0.0625 = fieldNorm(doc=2343)
       0.4 = coord(10/25)
   

5. Kajanan, S.; Bao, Y.; Datta, A.; VanderMeer, D.; Dutta, K.: Efficient automatic search query formulation using phrase-level analysis (2014) 0.26

   0.25777838 = sum of:
     0.25777838 = product of:
       0.6444459 = sum of:
         0.03444624 = weight(abstract_txt:search in 2264) [ClassicSimilarity], result of:
           0.03444624 = score(doc=2264,freq=11.0), product of:
             0.06062679 = queryWeight, product of:
               1.0467175 = boost
               3.654598 = idf(docFreq=3123, maxDocs=44421)
               0.015848767 = queryNorm
             0.56816864 = fieldWeight in 2264, product of:
               3.3166249 = tf(freq=11.0), with freq of:
                 11.0 = termFreq=11.0
               3.654598 = idf(docFreq=3123, maxDocs=44421)
               0.046875 = fieldNorm(doc=2264)
         0.042601895 = weight(abstract_txt:differs in 2264) [ClassicSimilarity], result of:
           0.042601895 = score(doc=2264,freq=1.0), product of:
             0.12330393 = queryWeight, product of:
               1.0555302 = boost
               7.370734 = idf(docFreq=75, maxDocs=44421)
               0.015848767 = queryNorm
             0.34550315 = fieldWeight in 2264, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.370734 = idf(docFreq=75, maxDocs=44421)
               0.046875 = fieldNorm(doc=2264)
         0.016756067 = weight(abstract_txt:searching in 2264) [ClassicSimilarity], result of:
           0.016756067 = score(doc=2264,freq=1.0), product of:
             0.083396725 = queryWeight, product of:
               1.2276419 = boost
               4.2862926 = idf(docFreq=1660, maxDocs=44421)
               0.015848767 = queryNorm
             0.20091996 = fieldWeight in 2264, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.2862926 = idf(docFreq=1660, maxDocs=44421)
               0.046875 = fieldNorm(doc=2264)
         0.018137574 = weight(abstract_txt:show in 2264) [ClassicSimilarity], result of:
           0.018137574 = score(doc=2264,freq=1.0), product of:
             0.08791988 = queryWeight, product of:
               1.2604939 = boost
               4.400995 = idf(docFreq=1480, maxDocs=44421)
               0.015848767 = queryNorm
             0.20629662 = fieldWeight in 2264, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.400995 = idf(docFreq=1480, maxDocs=44421)
               0.046875 = fieldNorm(doc=2264)
         0.03960952 = weight(abstract_txt:query in 2264) [ClassicSimilarity], result of:
           0.03960952 = score(doc=2264,freq=3.0), product of:
             0.102610916 = queryWeight, product of:
               1.3617394 = boost
               4.754492 = idf(docFreq=1039, maxDocs=44421)
               0.015848767 = queryNorm
             0.38601664 = fieldWeight in 2264, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               4.754492 = idf(docFreq=1039, maxDocs=44421)
               0.046875 = fieldNorm(doc=2264)
         0.023335693 = weight(abstract_txt:that in 2264) [ClassicSimilarity], result of:
           0.023335693 = score(doc=2264,freq=11.0), product of:
             0.06346932 = queryWeight, product of:
               1.6933594 = boost
               2.3649352 = idf(docFreq=11344, maxDocs=44421)
               0.015848767 = queryNorm
             0.36766887 = fieldWeight in 2264, product of:
               3.3166249 = tf(freq=11.0), with freq of:
                 11.0 = termFreq=11.0
               2.3649352 = idf(docFreq=11344, maxDocs=44421)
               0.046875 = fieldNorm(doc=2264)
         0.017038044 = weight(abstract_txt:such in 2264) [ClassicSimilarity], result of:
           0.017038044 = score(doc=2264,freq=1.0), product of:
             0.10624881 = queryWeight, product of:
               1.9596307 = boost
               3.42101 = idf(docFreq=3945, maxDocs=44421)
               0.015848767 = queryNorm
             0.16035984 = fieldWeight in 2264, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.42101 = idf(docFreq=3945, maxDocs=44421)
               0.046875 = fieldNorm(doc=2264)
         0.11454002 = weight(abstract_txt:phrase in 2264) [ClassicSimilarity], result of:
           0.11454002 = score(doc=2264,freq=1.0), product of:
             0.3438504 = queryWeight, product of:
               3.0530055 = boost
               7.1063476 = idf(docFreq=98, maxDocs=44421)
               0.015848767 = queryNorm
             0.33311003 = fieldWeight in 2264, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.1063476 = idf(docFreq=98, maxDocs=44421)
               0.046875 = fieldNorm(doc=2264)
         0.08528959 = weight(abstract_txt:terms in 2264) [ClassicSimilarity], result of:
           0.08528959 = score(doc=2264,freq=3.0), product of:
             0.25978488 = queryWeight, product of:
               4.0535746 = boost
               4.043712 = idf(docFreq=2116, maxDocs=44421)
               0.015848767 = queryNorm
             0.32830852 = fieldWeight in 2264, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               4.043712 = idf(docFreq=2116, maxDocs=44421)
               0.046875 = fieldNorm(doc=2264)
         0.25269124 = weight(abstract_txt:queries in 2264) [ClassicSimilarity], result of:
           0.25269124 = score(doc=2264,freq=5.0), product of:
             0.4725608 = queryWeight, product of:
               5.844617 = boost
               5.1015973 = idf(docFreq=734, maxDocs=44421)
               0.015848767 = queryNorm
             0.53472745 = fieldWeight in 2264, product of:
               2.236068 = tf(freq=5.0), with freq of:
                 5.0 = termFreq=5.0
               5.1015973 = idf(docFreq=734, maxDocs=44421)
               0.046875 = fieldNorm(doc=2264)
       0.4 = coord(10/25)