-
Ellis, D.: Progress and problems in information retrieval (1996)
0.01
0.012291762 = product of:
0.024583524 = sum of:
0.024583524 = product of:
0.04916705 = sum of:
0.04916705 = weight(_text_:22 in 789) [ClassicSimilarity], result of:
0.04916705 = score(doc=789,freq=2.0), product of:
0.15884887 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.04536168 = queryNorm
0.30952093 = fieldWeight in 789, 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=789)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Date
- 26. 7.2002 20:22:46
-
Wood, F.; Ford, N.; Walsh, C.: ¬The effect of postings information on search behaviour (1994)
0.01
0.011942998 = product of:
0.023885995 = sum of:
0.023885995 = product of:
0.04777199 = sum of:
0.04777199 = weight(_text_:f in 6890) [ClassicSimilarity], result of:
0.04777199 = score(doc=6890,freq=2.0), product of:
0.18080194 = queryWeight, product of:
3.985786 = idf(docFreq=2232, maxDocs=44218)
0.04536168 = queryNorm
0.26422277 = fieldWeight in 6890, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.985786 = idf(docFreq=2232, maxDocs=44218)
0.046875 = fieldNorm(doc=6890)
0.5 = coord(1/2)
0.5 = coord(1/2)
-
Ribeiro, F.: Subject indexing and authority control in archives : the need for subject indexing in archives and for an indexing policy using controlled language (1996)
0.01
0.011942998 = product of:
0.023885995 = sum of:
0.023885995 = product of:
0.04777199 = sum of:
0.04777199 = weight(_text_:f in 6577) [ClassicSimilarity], result of:
0.04777199 = score(doc=6577,freq=2.0), product of:
0.18080194 = queryWeight, product of:
3.985786 = idf(docFreq=2232, maxDocs=44218)
0.04536168 = queryNorm
0.26422277 = fieldWeight in 6577, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.985786 = idf(docFreq=2232, maxDocs=44218)
0.046875 = fieldNorm(doc=6577)
0.5 = coord(1/2)
0.5 = coord(1/2)
-
¬The Second Text Retrieval Conference : TREC-2 (1995)
0.01
0.011942998 = product of:
0.023885995 = sum of:
0.023885995 = product of:
0.04777199 = sum of:
0.04777199 = weight(_text_:f in 1320) [ClassicSimilarity], result of:
0.04777199 = score(doc=1320,freq=2.0), product of:
0.18080194 = queryWeight, product of:
3.985786 = idf(docFreq=2232, maxDocs=44218)
0.04536168 = queryNorm
0.26422277 = fieldWeight in 1320, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.985786 = idf(docFreq=2232, maxDocs=44218)
0.046875 = fieldNorm(doc=1320)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Content
- Enthält die Beiträge: HARMAN, D.: Overview of the Second Text Retrieval Conference (TREC-2); SPRACK JONES, K.: Reflections on TREC; BUCKLEY, C., J. ALLAN u. G. SALTON: Automatic routing and retrieval using SMART: TREC-2; CALLAN, J.P., W.B. CROFT u. J. BROGLIO: TREC and TIPSTER experiments with INQUERY; ROBERTSON, S.R., S. WALKER u. M.M. HANCOCK-BEAULIEU: Large test collection experiments on an operational, interactive system: OKAPI at TREC; ZOBEL, J., A. MOFFAT, R. WILKINSON u. R. SACKS-DAVIS: Efficient retrieval of partial documents; METTLER, M. u. F. NORDBY: TREC routing experiments with the TRW/Paracel Fast Data Finder; EVANS, D.A. u. R.G. LEFFERTS: CLARIT-TREC experiments; STRZALKOWSKI, T.: Natural language information retrieval; CAID, W.R., S.T. DUMAIS u. S.I. GALLANT: Learned vector-space models for document retrieval; BELKIN, N.J. P. KANTOR, E.A. FOX u. J.A. SHAW: Combining the evidence of multiple query representations for information retrieval
-
Colace, F.; Santo, M. de; Greco, L.; Napoletano, P.: Improving relevance feedback-based query expansion by the use of a weighted word pairs approach (2015)
0.01
0.011942998 = product of:
0.023885995 = sum of:
0.023885995 = product of:
0.04777199 = sum of:
0.04777199 = weight(_text_:f in 2263) [ClassicSimilarity], result of:
0.04777199 = score(doc=2263,freq=2.0), product of:
0.18080194 = queryWeight, product of:
3.985786 = idf(docFreq=2232, maxDocs=44218)
0.04536168 = queryNorm
0.26422277 = fieldWeight in 2263, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.985786 = idf(docFreq=2232, maxDocs=44218)
0.046875 = fieldNorm(doc=2263)
0.5 = coord(1/2)
0.5 = coord(1/2)
-
Blagden, J.F.: How much noise in a role-free and link-free co-ordinate indexing system? (1966)
0.01
0.010755292 = product of:
0.021510584 = sum of:
0.021510584 = product of:
0.04302117 = sum of:
0.04302117 = weight(_text_:22 in 2718) [ClassicSimilarity], result of:
0.04302117 = score(doc=2718,freq=2.0), product of:
0.15884887 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.04536168 = queryNorm
0.2708308 = fieldWeight in 2718, 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=2718)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Journal of documentation. 22(1966), S.203-209
-
Smithson, S.: Information retrieval evaluation in practice : a case study approach (1994)
0.01
0.010755292 = product of:
0.021510584 = sum of:
0.021510584 = product of:
0.04302117 = sum of:
0.04302117 = weight(_text_:22 in 7302) [ClassicSimilarity], result of:
0.04302117 = score(doc=7302,freq=2.0), product of:
0.15884887 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.04536168 = queryNorm
0.2708308 = fieldWeight in 7302, 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=7302)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Abstract
- The evaluation of information retrieval systems is an important yet difficult operation. This paper describes an exploratory evaluation study that takes an interpretive approach to evaluation. The longitudinal study examines evaluation through the information-seeking behaviour of 22 case studies of 'real' users. The eclectic approach to data collection produced behavioral data that is compared with relevance judgements and satisfaction ratings. The study demonstrates considerable variations among the cases, among different evaluation measures within the same case, and among the same measures at different stages within a single case. It is argued that those involved in evaluation should be aware of the difficulties, and base any evaluation on a good understanding of the cases in question
-
Blair, D.C.: STAIRS Redux : thoughts on the STAIRS evaluation, ten years after (1996)
0.01
0.010755292 = product of:
0.021510584 = sum of:
0.021510584 = product of:
0.04302117 = sum of:
0.04302117 = weight(_text_:22 in 3002) [ClassicSimilarity], result of:
0.04302117 = score(doc=3002,freq=2.0), product of:
0.15884887 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.04536168 = queryNorm
0.2708308 = fieldWeight in 3002, 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=3002)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Journal of the American Society for Information Science. 47(1996) no.1, S.4-22
-
Losee, R.M.: Determining information retrieval and filtering performance without experimentation (1995)
0.01
0.010755292 = product of:
0.021510584 = sum of:
0.021510584 = product of:
0.04302117 = sum of:
0.04302117 = weight(_text_:22 in 3368) [ClassicSimilarity], result of:
0.04302117 = score(doc=3368,freq=2.0), product of:
0.15884887 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.04536168 = queryNorm
0.2708308 = fieldWeight in 3368, 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=3368)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Date
- 22. 2.1996 13:14:10
-
Hodges, P.R.: Keyword in title indexes : effectiveness of retrieval in computer searches (1983)
0.01
0.010755292 = product of:
0.021510584 = sum of:
0.021510584 = product of:
0.04302117 = sum of:
0.04302117 = weight(_text_:22 in 5001) [ClassicSimilarity], result of:
0.04302117 = score(doc=5001,freq=2.0), product of:
0.15884887 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.04536168 = queryNorm
0.2708308 = fieldWeight in 5001, 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=5001)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Date
- 14. 3.1996 13:22:21
-
Brown, M.E.: By any other name : accounting for failure in the naming of subject categories (1995)
0.01
0.010755292 = product of:
0.021510584 = sum of:
0.021510584 = product of:
0.04302117 = sum of:
0.04302117 = weight(_text_:22 in 5598) [ClassicSimilarity], result of:
0.04302117 = score(doc=5598,freq=2.0), product of:
0.15884887 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.04536168 = queryNorm
0.2708308 = fieldWeight in 5598, 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=5598)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Date
- 2.11.1996 13:08:22
-
López-Pujalte, C.; Guerrero-Bote, V.P.; Moya-Anegón, F. de: Order-based fitness functions for genetic algorithms applied to relevance feedback (2003)
0.01
0.009952499 = product of:
0.019904997 = sum of:
0.019904997 = product of:
0.039809994 = sum of:
0.039809994 = weight(_text_:f in 5154) [ClassicSimilarity], result of:
0.039809994 = score(doc=5154,freq=2.0), product of:
0.18080194 = queryWeight, product of:
3.985786 = idf(docFreq=2232, maxDocs=44218)
0.04536168 = queryNorm
0.22018565 = fieldWeight in 5154, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.985786 = idf(docFreq=2232, maxDocs=44218)
0.0390625 = fieldNorm(doc=5154)
0.5 = coord(1/2)
0.5 = coord(1/2)
-
Saracevic, T.: Effects of inconsistent relevance judgments on information retrieval test results : a historical perspective (2008)
0.01
0.009952499 = product of:
0.019904997 = sum of:
0.019904997 = product of:
0.039809994 = sum of:
0.039809994 = weight(_text_:f in 5585) [ClassicSimilarity], result of:
0.039809994 = score(doc=5585,freq=2.0), product of:
0.18080194 = queryWeight, product of:
3.985786 = idf(docFreq=2232, maxDocs=44218)
0.04536168 = queryNorm
0.22018565 = fieldWeight in 5585, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.985786 = idf(docFreq=2232, maxDocs=44218)
0.0390625 = fieldNorm(doc=5585)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Content
- Beitrag in einem Themenheft 'The Influence of F. W. Lancaster on Information Science and on Libraries', das als Festschrift für F.W. Lancaster deklariert ist.
-
Iivonen, M.: Consistency in the selection of search concepts and search terms (1995)
0.01
0.009218821 = product of:
0.018437643 = sum of:
0.018437643 = product of:
0.036875285 = sum of:
0.036875285 = weight(_text_:22 in 1757) [ClassicSimilarity], result of:
0.036875285 = score(doc=1757,freq=2.0), product of:
0.15884887 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.04536168 = queryNorm
0.23214069 = fieldWeight in 1757, 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=1757)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Abstract
- Considers intersearcher and intrasearcher consistency in the selection of search terms. Based on an empirical study where 22 searchers from 4 different types of search environments analyzed altogether 12 search requests of 4 different types in 2 separate test situations between which 2 months elapsed. Statistically very significant differences in consistency were found according to the types of search environments and search requests. Consistency was also considered according to the extent of the scope of search concept. At level I search terms were compared character by character. At level II different search terms were accepted as the same search concept with a rather simple evaluation of linguistic expressions. At level III, in addition to level II, the hierarchical approach of the search request was also controlled. At level IV different search terms were accepted as the same search concept with a broad interpretation of the search concept. Both intersearcher and intrasearcher consistency grew most immediately after a rather simple evaluation of linguistic impressions
-
Sievert, M.E.; McKinin, E.J.: Why full-text misses some relevant documents : an analysis of documents not retrieved by CCML or MEDIS (1989)
0.01
0.009218821 = product of:
0.018437643 = sum of:
0.018437643 = product of:
0.036875285 = sum of:
0.036875285 = weight(_text_:22 in 3564) [ClassicSimilarity], result of:
0.036875285 = score(doc=3564,freq=2.0), product of:
0.15884887 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.04536168 = queryNorm
0.23214069 = fieldWeight in 3564, 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=3564)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Date
- 9. 1.1996 10:22:31
-
Leininger, K.: Interindexer consistency in PsychINFO (2000)
0.01
0.009218821 = product of:
0.018437643 = sum of:
0.018437643 = product of:
0.036875285 = sum of:
0.036875285 = weight(_text_:22 in 2552) [ClassicSimilarity], result of:
0.036875285 = score(doc=2552,freq=2.0), product of:
0.15884887 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.04536168 = queryNorm
0.23214069 = fieldWeight in 2552, 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=2552)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Date
- 9. 2.1997 18:44:22
-
Lancaster, F.W.: Evaluating the performance of a large computerized information system (1985)
0.01
0.007961999 = product of:
0.015923997 = sum of:
0.015923997 = product of:
0.031847995 = sum of:
0.031847995 = weight(_text_:f in 3649) [ClassicSimilarity], result of:
0.031847995 = score(doc=3649,freq=2.0), product of:
0.18080194 = queryWeight, product of:
3.985786 = idf(docFreq=2232, maxDocs=44218)
0.04536168 = queryNorm
0.17614852 = fieldWeight in 3649, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.985786 = idf(docFreq=2232, maxDocs=44218)
0.03125 = fieldNorm(doc=3649)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Abstract
- F. W. Lancaster is known for his writing an the state of the art in librarylinformation science. His skill in identifying significant contributions and synthesizing literature in fields as diverse as online systems, vocabulary control, measurement and evaluation, and the paperless society have earned him esteem as a chronicler of information science. Equally deserving of repute is his own contribution to research in the discipline-his evaluation of the MEDLARS operating system. The MEDLARS study is notable for several reasons. It was the first large-scale application of retrieval experiment methodology to the evaluation of an actual operating system. As such, problems had to be faced that do not arise in laboratory-like conditions. One example is the problem of recall: how to determine, for a very large and dynamic database, the number of documents relevant to a given search request. By solving this problem and others attendant upon transferring an experimental methodology to the real world, Lancaster created a constructive procedure that could be used to improve the design and functioning of retrieval systems. The MEDLARS study is notable also for its contribution to our understanding of what constitutes a good index language and good indexing. The ideal retrieval system would be one that retrieves all and only relevant documents. The failures that occur in real operating systems, when a relevant document is not retrieved (a recall failure) or an irrelevant document is retrieved (a precision failure), can be analysed to assess the impact of various factors an the performance of the system. This is exactly what Lancaster did. He found both the MEDLARS indexing and the McSH index language to be significant factors affecting retrieval performance. The indexing, primarily because it was insufficiently exhaustive, explained a large number of recall failures. The index language, largely because of its insufficient specificity, accounted for a large number of precision failures. The purpose of identifying factors responsible for a system's failures is ultimately to improve the system. Unlike many user studies, the MEDLARS evaluation yielded recommendations that were eventually implemented.* Indexing exhaustivity was increased and the McSH index language was enriched with more specific terms and a larger entry vocabulary.
-
Lioma, C.; Ounis, I.: ¬A syntactically-based query reformulation technique for information retrieval (2008)
0.01
0.007961999 = product of:
0.015923997 = sum of:
0.015923997 = product of:
0.031847995 = sum of:
0.031847995 = weight(_text_:f in 2031) [ClassicSimilarity], result of:
0.031847995 = score(doc=2031,freq=2.0), product of:
0.18080194 = queryWeight, product of:
3.985786 = idf(docFreq=2232, maxDocs=44218)
0.04536168 = queryNorm
0.17614852 = fieldWeight in 2031, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.985786 = idf(docFreq=2232, maxDocs=44218)
0.03125 = fieldNorm(doc=2031)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Abstract
- Whereas in language words of high frequency are generally associated with low content [Bookstein, A., & Swanson, D. (1974). Probabilistic models for automatic indexing. Journal of the American Society of Information Science, 25(5), 312-318; Damerau, F. J. (1965). An experiment in automatic indexing. American Documentation, 16, 283-289; Harter, S. P. (1974). A probabilistic approach to automatic keyword indexing. PhD thesis, University of Chicago; Sparck-Jones, K. (1972). A statistical interpretation of term specificity and its application in retrieval. Journal of Documentation, 28, 11-21; Yu, C., & Salton, G. (1976). Precision weighting - an effective automatic indexing method. Journal of the Association for Computer Machinery (ACM), 23(1), 76-88], shallow syntactic fragments of high frequency generally correspond to lexical fragments of high content [Lioma, C., & Ounis, I. (2006). Examining the content load of part of speech blocks for information retrieval. In Proceedings of the international committee on computational linguistics and the association for computational linguistics (COLING/ACL 2006), Sydney, Australia]. We implement this finding to Information Retrieval, as follows. We present a novel automatic query reformulation technique, which is based on shallow syntactic evidence induced from various language samples, and used to enhance the performance of an Information Retrieval system. Firstly, we draw shallow syntactic evidence from language samples of varying size, and compare the effect of language sample size upon retrieval performance, when using our syntactically-based query reformulation (SQR) technique. Secondly, we compare SQR to a state-of-the-art probabilistic pseudo-relevance feedback technique. Additionally, we combine both techniques and evaluate their compatibility. We evaluate our proposed technique across two standard Text REtrieval Conference (TREC) English test collections, and three statistically different weighting models. Experimental results suggest that SQR markedly enhances retrieval performance, and is at least comparable to pseudo-relevance feedback. Notably, the combination of SQR and pseudo-relevance feedback further enhances retrieval performance considerably. These collective experimental results confirm the tenet that high frequency shallow syntactic fragments correspond to content-bearing lexical fragments.
-
Belkin, N.J.: ¬An overview of results from Rutgers' investigations of interactive information retrieval (1998)
0.01
0.0076823514 = product of:
0.015364703 = sum of:
0.015364703 = product of:
0.030729406 = sum of:
0.030729406 = weight(_text_:22 in 2339) [ClassicSimilarity], result of:
0.030729406 = score(doc=2339,freq=2.0), product of:
0.15884887 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.04536168 = queryNorm
0.19345059 = fieldWeight in 2339, 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=2339)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Date
- 22. 9.1997 19:16:05
-
King, D.W.: Blazing new trails : in celebration of an audacious career (2000)
0.01
0.0076823514 = product of:
0.015364703 = sum of:
0.015364703 = product of:
0.030729406 = sum of:
0.030729406 = weight(_text_:22 in 1184) [ClassicSimilarity], result of:
0.030729406 = score(doc=1184,freq=2.0), product of:
0.15884887 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.04536168 = queryNorm
0.19345059 = fieldWeight in 1184, 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=1184)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Date
- 22. 9.1997 19:16:05
