-
Ravana, S.D.; Rajagopal, P.; Balakrishnan, V.: Ranking retrieval systems using pseudo relevance judgments (2015)
0.03
0.03351226 = product of:
0.06702452 = sum of:
0.06702452 = product of:
0.10053678 = sum of:
0.05808722 = weight(_text_:v in 2591) [ClassicSimilarity], result of:
0.05808722 = score(doc=2591,freq=2.0), product of:
0.21584865 = queryWeight, product of:
4.871427 = idf(docFreq=920, maxDocs=44218)
0.04430912 = queryNorm
0.26911086 = fieldWeight in 2591, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
4.871427 = idf(docFreq=920, maxDocs=44218)
0.0390625 = fieldNorm(doc=2591)
0.042449556 = weight(_text_:22 in 2591) [ClassicSimilarity], result of:
0.042449556 = score(doc=2591,freq=4.0), product of:
0.15516299 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.04430912 = queryNorm
0.27358043 = fieldWeight in 2591, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.0390625 = fieldNorm(doc=2591)
0.6666667 = coord(2/3)
0.5 = coord(1/2)
- Date
- 20. 1.2015 18:30:22
18. 9.2018 18:22:56
-
Khoo, C.S.G.; Wan, K.-W.: ¬A simple relevancy-ranking strategy for an interface to Boolean OPACs (2004)
0.02
0.020557504 = product of:
0.04111501 = sum of:
0.04111501 = product of:
0.06167251 = sum of:
0.040661052 = weight(_text_:v in 2509) [ClassicSimilarity], result of:
0.040661052 = score(doc=2509,freq=2.0), product of:
0.21584865 = queryWeight, product of:
4.871427 = idf(docFreq=920, maxDocs=44218)
0.04430912 = queryNorm
0.1883776 = fieldWeight in 2509, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
4.871427 = idf(docFreq=920, maxDocs=44218)
0.02734375 = fieldNorm(doc=2509)
0.021011459 = weight(_text_:22 in 2509) [ClassicSimilarity], result of:
0.021011459 = score(doc=2509,freq=2.0), product of:
0.15516299 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.04430912 = queryNorm
0.1354154 = fieldWeight in 2509, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.02734375 = fieldNorm(doc=2509)
0.6666667 = coord(2/3)
0.5 = coord(1/2)
- Content
- "Most Web search engines accept natural language queries, perform some kind of fuzzy matching and produce ranked output, displaying first the documents that are most likely to be relevant. On the other hand, most library online public access catalogs (OPACs) an the Web are still Boolean retrieval systems that perform exact matching, and require users to express their search requests precisely in a Boolean search language and to refine their search statements to improve the search results. It is well-documented that users have difficulty searching Boolean OPACs effectively (e.g. Borgman, 1996; Ensor, 1992; Wallace, 1993). One approach to making OPACs easier to use is to develop a natural language search interface that acts as a middleware between the user's Web browser and the OPAC system. The search interface can accept a natural language query from the user and reformulate it as a series of Boolean search statements that are then submitted to the OPAC. The records retrieved by the OPAC are ranked by the search interface before forwarding them to the user's Web browser. The user, then, does not need to interact directly with the Boolean OPAC but with the natural language search interface or search intermediary. The search interface interacts with the OPAC system an the user's behalf. The advantage of this approach is that no modification to the OPAC or library system is required. Furthermore, the search interface can access multiple OPACs, acting as a meta search engine, and integrate search results from various OPACs before sending them to the user. The search interface needs to incorporate a method for converting the user's natural language query into a series of Boolean search statements, and for ranking the OPAC records retrieved. The purpose of this study was to develop a relevancyranking algorithm for a search interface to Boolean OPAC systems. This is part of an on-going effort to develop a knowledge-based search interface to OPACs called the E-Referencer (Khoo et al., 1998, 1999; Poo et al., 2000). E-Referencer v. 2 that has been implemented applies a repertoire of initial search strategies and reformulation strategies to retrieve records from OPACs using the Z39.50 protocol, and also assists users in mapping query keywords to the Library of Congress subject headings."
- Source
- Electronic library. 22(2004) no.2, S.112-120
-
Liddy, E.D.; Diamond, T.; McKenna, M.: DR-LINK in TIPSTER (2000)
0.02
0.02025951 = product of:
0.04051902 = sum of:
0.04051902 = product of:
0.12155706 = sum of:
0.12155706 = weight(_text_:t in 3907) [ClassicSimilarity], result of:
0.12155706 = score(doc=3907,freq=2.0), product of:
0.17455173 = queryWeight, product of:
3.9394085 = idf(docFreq=2338, maxDocs=44218)
0.04430912 = queryNorm
0.69639564 = fieldWeight in 3907, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.9394085 = idf(docFreq=2338, maxDocs=44218)
0.125 = fieldNorm(doc=3907)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
-
Yu, K.; Tresp, V.; Yu, S.: ¬A nonparametric hierarchical Bayesian framework for information filtering (2004)
0.02
0.019362407 = product of:
0.038724814 = sum of:
0.038724814 = product of:
0.11617444 = sum of:
0.11617444 = weight(_text_:v in 4117) [ClassicSimilarity], result of:
0.11617444 = score(doc=4117,freq=2.0), product of:
0.21584865 = queryWeight, product of:
4.871427 = idf(docFreq=920, maxDocs=44218)
0.04430912 = queryNorm
0.5382217 = fieldWeight in 4117, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
4.871427 = idf(docFreq=920, maxDocs=44218)
0.078125 = fieldNorm(doc=4117)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
-
Niemi, T.; Junkkari, M.; Järvelin, K.; Viita, S.: Advanced query language for manipulating complex entities (2004)
0.02
0.017727071 = product of:
0.035454143 = sum of:
0.035454143 = product of:
0.106362425 = sum of:
0.106362425 = weight(_text_:t in 4218) [ClassicSimilarity], result of:
0.106362425 = score(doc=4218,freq=2.0), product of:
0.17455173 = queryWeight, product of:
3.9394085 = idf(docFreq=2338, maxDocs=44218)
0.04430912 = queryNorm
0.60934615 = fieldWeight in 4218, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.9394085 = idf(docFreq=2338, maxDocs=44218)
0.109375 = fieldNorm(doc=4218)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
-
Voorhees, E.M.: Implementing agglomerative hierarchic clustering algorithms for use in document retrieval (1986)
0.02
0.016008731 = product of:
0.032017462 = sum of:
0.032017462 = product of:
0.096052386 = sum of:
0.096052386 = weight(_text_:22 in 402) [ClassicSimilarity], result of:
0.096052386 = score(doc=402,freq=2.0), product of:
0.15516299 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.04430912 = queryNorm
0.61904186 = fieldWeight in 402, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.125 = fieldNorm(doc=402)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
- Source
- Information processing and management. 22(1986) no.6, S.465-476
-
Guerrero-Bote, V.P.; Moya Anegón, F. de; Herrero Solana, V.: Document organization using Kohonen's algorithm (2002)
0.02
0.015489925 = product of:
0.03097985 = sum of:
0.03097985 = product of:
0.09293955 = sum of:
0.09293955 = weight(_text_:v in 2564) [ClassicSimilarity], result of:
0.09293955 = score(doc=2564,freq=2.0), product of:
0.21584865 = queryWeight, product of:
4.871427 = idf(docFreq=920, maxDocs=44218)
0.04430912 = queryNorm
0.43057737 = fieldWeight in 2564, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
4.871427 = idf(docFreq=920, maxDocs=44218)
0.0625 = fieldNorm(doc=2564)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
-
Smeaton, A.F.; Rijsbergen, C.J. van: ¬The retrieval effects of query expansion on a feedback document retrieval system (1983)
0.01
0.014007639 = product of:
0.028015278 = sum of:
0.028015278 = product of:
0.084045835 = sum of:
0.084045835 = weight(_text_:22 in 2134) [ClassicSimilarity], result of:
0.084045835 = score(doc=2134,freq=2.0), product of:
0.15516299 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.04430912 = queryNorm
0.5416616 = fieldWeight in 2134, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.109375 = fieldNorm(doc=2134)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
- Date
- 30. 3.2001 13:32:22
-
Back, J.: ¬An evaluation of relevancy ranking techniques used by Internet search engines (2000)
0.01
0.014007639 = product of:
0.028015278 = sum of:
0.028015278 = product of:
0.084045835 = sum of:
0.084045835 = weight(_text_:22 in 3445) [ClassicSimilarity], result of:
0.084045835 = score(doc=3445,freq=2.0), product of:
0.15516299 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.04430912 = queryNorm
0.5416616 = fieldWeight in 3445, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.109375 = fieldNorm(doc=3445)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
- Date
- 25. 8.2005 17:42:22
-
Torra, V.; Miyamoto, S.; Lanau, S.: Exploration of textual document archives using a fuzzy hierarchical clustering algorithm in the GAMBAL system (2005)
0.01
0.013553685 = product of:
0.02710737 = sum of:
0.02710737 = product of:
0.081322104 = sum of:
0.081322104 = weight(_text_:v in 1028) [ClassicSimilarity], result of:
0.081322104 = score(doc=1028,freq=2.0), product of:
0.21584865 = queryWeight, product of:
4.871427 = idf(docFreq=920, maxDocs=44218)
0.04430912 = queryNorm
0.3767552 = fieldWeight in 1028, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
4.871427 = idf(docFreq=920, maxDocs=44218)
0.0546875 = fieldNorm(doc=1028)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
-
Ruthven, I.; Lalmas, M.: Selective relevance feedback using term characteristics (1999)
0.01
0.012662194 = product of:
0.025324387 = sum of:
0.025324387 = product of:
0.07597316 = sum of:
0.07597316 = weight(_text_:t in 3824) [ClassicSimilarity], result of:
0.07597316 = score(doc=3824,freq=2.0), product of:
0.17455173 = queryWeight, product of:
3.9394085 = idf(docFreq=2338, maxDocs=44218)
0.04430912 = queryNorm
0.43524727 = fieldWeight in 3824, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.9394085 = idf(docFreq=2338, maxDocs=44218)
0.078125 = fieldNorm(doc=3824)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
- Source
- Vocabulary as a central concept in digital libraries: interdisciplinary concepts, challenges, and opportunities : proceedings of the Third International Conference an Conceptions of Library and Information Science (COLIS3), Dubrovnik, Croatia, 23-26 May 1999. Ed. by T. Arpanac et al
-
Fuhr, N.: Ranking-Experimente mit gewichteter Indexierung (1986)
0.01
0.012006547 = product of:
0.024013095 = sum of:
0.024013095 = product of:
0.072039284 = sum of:
0.072039284 = weight(_text_:22 in 58) [ClassicSimilarity], result of:
0.072039284 = score(doc=58,freq=2.0), product of:
0.15516299 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.04430912 = queryNorm
0.46428138 = fieldWeight in 58, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.09375 = fieldNorm(doc=58)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
- Date
- 14. 6.2015 22:12:44
-
Fuhr, N.: Rankingexperimente mit gewichteter Indexierung (1986)
0.01
0.012006547 = product of:
0.024013095 = sum of:
0.024013095 = product of:
0.072039284 = sum of:
0.072039284 = weight(_text_:22 in 2051) [ClassicSimilarity], result of:
0.072039284 = score(doc=2051,freq=2.0), product of:
0.15516299 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.04430912 = queryNorm
0.46428138 = fieldWeight in 2051, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.09375 = fieldNorm(doc=2051)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
- Date
- 14. 6.2015 22:12:56
-
Aigrain, P.; Longueville, V.: ¬A model for the evaluation of expansion techniques in information retrieval systems (1994)
0.01
0.0116174435 = product of:
0.023234887 = sum of:
0.023234887 = product of:
0.06970466 = sum of:
0.06970466 = weight(_text_:v in 5331) [ClassicSimilarity], result of:
0.06970466 = score(doc=5331,freq=2.0), product of:
0.21584865 = queryWeight, product of:
4.871427 = idf(docFreq=920, maxDocs=44218)
0.04430912 = queryNorm
0.32293302 = fieldWeight in 5331, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
4.871427 = idf(docFreq=920, maxDocs=44218)
0.046875 = fieldNorm(doc=5331)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
-
Nagelschmidt, M.: Verfahren zur Anfragemodifikation im Information Retrieval (2008)
0.01
0.0116174435 = product of:
0.023234887 = sum of:
0.023234887 = product of:
0.06970466 = sum of:
0.06970466 = weight(_text_:v in 2774) [ClassicSimilarity], result of:
0.06970466 = score(doc=2774,freq=2.0), product of:
0.21584865 = queryWeight, product of:
4.871427 = idf(docFreq=920, maxDocs=44218)
0.04430912 = queryNorm
0.32293302 = fieldWeight in 2774, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
4.871427 = idf(docFreq=920, maxDocs=44218)
0.046875 = fieldNorm(doc=2774)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
- Pages
- V, 110 S. + CD
-
Jindal, V.; Bawa, S.; Batra, S.: ¬A review of ranking approaches for semantic search on Web (2014)
0.01
0.0116174435 = product of:
0.023234887 = sum of:
0.023234887 = product of:
0.06970466 = sum of:
0.06970466 = weight(_text_:v in 2799) [ClassicSimilarity], result of:
0.06970466 = score(doc=2799,freq=2.0), product of:
0.21584865 = queryWeight, product of:
4.871427 = idf(docFreq=920, maxDocs=44218)
0.04430912 = queryNorm
0.32293302 = fieldWeight in 2799, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
4.871427 = idf(docFreq=920, maxDocs=44218)
0.046875 = fieldNorm(doc=2799)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
-
Dang, E.K.F.; Luk, R.W.P.; Allan, J.; Ho, K.S.; Chung, K.F.L.; Lee, D.L.: ¬A new context-dependent term weight computed by boost and discount using relevance information (2010)
0.01
0.010965781 = product of:
0.021931563 = sum of:
0.021931563 = product of:
0.065794684 = sum of:
0.065794684 = weight(_text_:t in 4120) [ClassicSimilarity], result of:
0.065794684 = score(doc=4120,freq=6.0), product of:
0.17455173 = queryWeight, product of:
3.9394085 = idf(docFreq=2338, maxDocs=44218)
0.04430912 = queryNorm
0.37693518 = fieldWeight in 4120, product of:
2.4494898 = tf(freq=6.0), with freq of:
6.0 = termFreq=6.0
3.9394085 = idf(docFreq=2338, maxDocs=44218)
0.0390625 = fieldNorm(doc=4120)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
- 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.
-
Gonnet, G.H.; Snider, T.; Baeza-Yates, R.A.: New indices for text : PAT trees and PAT arrays (1992)
0.01
0.010129755 = product of:
0.02025951 = sum of:
0.02025951 = product of:
0.06077853 = sum of:
0.06077853 = weight(_text_:t in 3500) [ClassicSimilarity], result of:
0.06077853 = score(doc=3500,freq=2.0), product of:
0.17455173 = queryWeight, product of:
3.9394085 = idf(docFreq=2338, maxDocs=44218)
0.04430912 = queryNorm
0.34819782 = fieldWeight in 3500, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.9394085 = idf(docFreq=2338, maxDocs=44218)
0.0625 = fieldNorm(doc=3500)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
-
Mandl, T.: Web- und Multimedia-Dokumente : Neuere Entwicklungen bei der Evaluierung von Information Retrieval Systemen (2003)
0.01
0.010129755 = product of:
0.02025951 = sum of:
0.02025951 = product of:
0.06077853 = sum of:
0.06077853 = weight(_text_:t in 1734) [ClassicSimilarity], result of:
0.06077853 = score(doc=1734,freq=2.0), product of:
0.17455173 = queryWeight, product of:
3.9394085 = idf(docFreq=2338, maxDocs=44218)
0.04430912 = queryNorm
0.34819782 = fieldWeight in 1734, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.9394085 = idf(docFreq=2338, maxDocs=44218)
0.0625 = fieldNorm(doc=1734)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
-
Behnert, C.; Borst, T.: Neue Formen der Relevanz-Sortierung in bibliothekarischen Informationssystemen : das DFG-Projekt LibRank (2015)
0.01
0.010129755 = product of:
0.02025951 = sum of:
0.02025951 = product of:
0.06077853 = sum of:
0.06077853 = weight(_text_:t in 5392) [ClassicSimilarity], result of:
0.06077853 = score(doc=5392,freq=2.0), product of:
0.17455173 = queryWeight, product of:
3.9394085 = idf(docFreq=2338, maxDocs=44218)
0.04430912 = queryNorm
0.34819782 = fieldWeight in 5392, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.9394085 = idf(docFreq=2338, maxDocs=44218)
0.0625 = fieldNorm(doc=5392)
0.33333334 = coord(1/3)
0.5 = coord(1/2)
