-
Robertson, A.M.; Willett, P.: Applications of n-grams in textual information systems (1998)
0.05
0.04551801 = product of:
0.09103602 = sum of:
0.09103602 = product of:
0.18207204 = sum of:
0.18207204 = weight(_text_:n in 4715) [ClassicSimilarity], result of:
0.18207204 = score(doc=4715,freq=12.0), product of:
0.19504215 = queryWeight, product of:
4.3116565 = idf(docFreq=1611, maxDocs=44218)
0.045236014 = queryNorm
0.933501 = fieldWeight in 4715, product of:
3.4641016 = tf(freq=12.0), with freq of:
12.0 = termFreq=12.0
4.3116565 = idf(docFreq=1611, maxDocs=44218)
0.0625 = fieldNorm(doc=4715)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Abstract
- Provides an introduction to the use of n-grams in textual information systems, where an n-gram is a string of n, usually adjacent, characters, extracted from a section of continuous text. Applications that can be implemented efficiently and effectively using sets of n-grams include spelling errors detection and correction, query expansion, information retrieval with serial, inverted and signature files, dictionary look up, text compression, and language identification
- Object
- n-grams
-
Tseng, Y.-H.: Solving vocabulary problems with interactive query expansion (1998)
0.02
0.016424898 = product of:
0.032849796 = sum of:
0.032849796 = product of:
0.06569959 = sum of:
0.06569959 = weight(_text_:n in 5159) [ClassicSimilarity], result of:
0.06569959 = score(doc=5159,freq=4.0), product of:
0.19504215 = queryWeight, product of:
4.3116565 = idf(docFreq=1611, maxDocs=44218)
0.045236014 = queryNorm
0.33684817 = fieldWeight in 5159, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
4.3116565 = idf(docFreq=1611, maxDocs=44218)
0.0390625 = fieldNorm(doc=5159)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Abstract
- One of the major causes of search failures in information retrieval systems is vocabulary mismatch. Presents a solution to the vocabulary problem through 2 strategies known as term suggestion (TS) and term relevance feedback (TRF). In TS, collection specific terms are extracted from the text collection. These terms and their frequencies constitute the keyword database for suggesting terms in response to users' queries. One effect of this term suggestion is that it functions as a dynamic directory if the query is a general term that contains broad meaning. In term relevance feedback, terms extracted from the top ranked documents retrieved from the previous query are shown to users for relevance feedback. In the experiment, interactive TS provides very high precision rates while achieving similar recall rates as n-gram matching. Local TRF achieves improvement in both precision and recall rate in a full text news database and degrades slightly in recall rate in bibliographic databases due to the very limited source of information for feedback. In terms of Rijsbergen's combined measure of recall and precision, both TS and TRF achieve better performance than n-gram matching, which implies that the greater improvement in precision rate compensates the slight degradation in recall rate for TS and TRF
-
Efthimiadis, E.N.: End-users' understanding of thesaural knowledge structures in interactive query expansion (1994)
0.01
0.012257711 = product of:
0.024515422 = sum of:
0.024515422 = product of:
0.049030844 = sum of:
0.049030844 = weight(_text_:22 in 5693) [ClassicSimilarity], result of:
0.049030844 = score(doc=5693,freq=2.0), product of:
0.15840882 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.045236014 = queryNorm
0.30952093 = fieldWeight in 5693, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.0625 = fieldNorm(doc=5693)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Date
- 30. 3.2001 13:35:22
-
Fieldhouse, M.; Hancock-Beaulieu, M.: ¬The design of a graphical user interface for a highly interactive information retrieval system (1996)
0.01
0.010725497 = product of:
0.021450995 = sum of:
0.021450995 = product of:
0.04290199 = sum of:
0.04290199 = weight(_text_:22 in 6958) [ClassicSimilarity], result of:
0.04290199 = score(doc=6958,freq=2.0), product of:
0.15840882 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.045236014 = queryNorm
0.2708308 = fieldWeight in 6958, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.0546875 = fieldNorm(doc=6958)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Information retrieval: new systems and current research. Proceedings of the 16th Research Colloquium of the British Computer Society Information Retrieval Specialist Group, Drymen, Scotland, 22-23 Mar 94. Ed.: R. Leon
-
Chang, C.-H.; Hsu, C.-C.: Integrating query expansion and conceptual relevance feedback for personalized Web information retrieval (1998)
0.01
0.010725497 = product of:
0.021450995 = sum of:
0.021450995 = product of:
0.04290199 = sum of:
0.04290199 = weight(_text_:22 in 1319) [ClassicSimilarity], result of:
0.04290199 = score(doc=1319,freq=2.0), product of:
0.15840882 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.045236014 = queryNorm
0.2708308 = fieldWeight in 1319, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.0546875 = fieldNorm(doc=1319)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Date
- 1. 8.1996 22:08:06
-
Lund, K.; Burgess, C.; Atchley, R.A.: Semantic and associative priming in high-dimensional semantic space (1995)
0.01
0.010725497 = product of:
0.021450995 = sum of:
0.021450995 = product of:
0.04290199 = sum of:
0.04290199 = weight(_text_:22 in 2151) [ClassicSimilarity], result of:
0.04290199 = score(doc=2151,freq=2.0), product of:
0.15840882 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.045236014 = queryNorm
0.2708308 = fieldWeight in 2151, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.0546875 = fieldNorm(doc=2151)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Proceedings of the Seventeenth Annual Conference of the Cognitive Science Society: July 22 - 25, 1995, University of Pittsburgh / ed. by Johanna D. Moore and Jill Fain Lehmann
-
Järvelin, K.; Kristensen, J.; Niemi, T.; Sormunen, E.; Keskustalo, H.: ¬A deductive data model for query expansion (1996)
0.01
0.0091932835 = product of:
0.018386567 = sum of:
0.018386567 = product of:
0.036773134 = sum of:
0.036773134 = weight(_text_:22 in 2230) [ClassicSimilarity], result of:
0.036773134 = score(doc=2230,freq=2.0), product of:
0.15840882 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.045236014 = queryNorm
0.23214069 = fieldWeight in 2230, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.046875 = fieldNorm(doc=2230)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Proceedings of the 19th Annual International ACM SIGIR Conference on Research and Development in Information Retrieval (ACM SIGIR '96), Zürich, Switzerland, August 18-22, 1996. Eds.: H.P. Frei et al
-
Efthimiadis, E.N.: User choices : a new yardstick for the evaluation of ranking algorithms for interactive query expansion (1995)
0.01
0.0076610697 = product of:
0.0153221395 = sum of:
0.0153221395 = product of:
0.030644279 = sum of:
0.030644279 = weight(_text_:22 in 5697) [ClassicSimilarity], result of:
0.030644279 = score(doc=5697,freq=2.0), product of:
0.15840882 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.045236014 = queryNorm
0.19345059 = fieldWeight in 5697, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.0390625 = fieldNorm(doc=5697)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Date
- 22. 2.1996 13:14:10
