-
Soergel, D.: Indexing and retrieval performance : the logical evidence (1994)
0.00
0.001674345 = product of:
0.00334869 = sum of:
0.00334869 = product of:
0.00669738 = sum of:
0.00669738 = weight(_text_:a in 579) [ClassicSimilarity], result of:
0.00669738 = score(doc=579,freq=4.0), product of:
0.053105544 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.046056706 = queryNorm
0.12611452 = fieldWeight in 579, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.0546875 = fieldNorm(doc=579)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Abstract
- This article presents a logical analysis of the characteristics of indexing and their effects on retrieval performance.It establishes the ability to ask the questions one needs to ask as the foundation of performance evaluation, and recall and discrimination as the basic quantitative performance measures for binary noninteractive retrieval systems. It then defines the characteristics of indexing that affect retrieval - namely, indexing devices, viewpoint-based and importance-based indexing exhaustivity, indexing specifity, indexing correctness, and indexing consistency - and examines in detail their effects on retrieval. It concludes that retrieval performance depends chiefly on the match between indexing and the requirements of the individual query and on the adaption of the query formulation to the characteristics of the retrieval system, and that the ensuing complexity must be considered in the design and testing of retrieval systems
- Type
- a
-
Boll, J.J.: DDC classification rules : an outline history and comparison of two sets of rules (1988)
0.00
0.001674345 = product of:
0.00334869 = sum of:
0.00334869 = product of:
0.00669738 = sum of:
0.00669738 = weight(_text_:a in 404) [ClassicSimilarity], result of:
0.00669738 = score(doc=404,freq=4.0), product of:
0.053105544 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.046056706 = queryNorm
0.12611452 = fieldWeight in 404, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.0546875 = fieldNorm(doc=404)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Abstract
- Melvil Dewey provided generally applicable classification guidelines or rules with his classification schedules, beginning with the second edition of his scheme. Many cataloging textbooks have adopted these guidelines. Recent editions of the DDC, however, provide considerably changed, quite intricate, and edition-specific rules. The resulting two different sets of classification rules are similar in theory but very different in application. Classifiers must be aware of both sets. They are summarized in two decision charts that are intended to illustrate the differences and similarities between the two sets of rules and to encourage consistent classification decisions. The need is expressed for a parallel, end-user-oriented searching code
- Type
- a
-
Biagetti, M.T.: Indexing and scientific research needs (2006)
0.00
0.001674345 = product of:
0.00334869 = sum of:
0.00334869 = product of:
0.00669738 = sum of:
0.00669738 = weight(_text_:a in 235) [ClassicSimilarity], result of:
0.00669738 = score(doc=235,freq=4.0), product of:
0.053105544 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.046056706 = queryNorm
0.12611452 = fieldWeight in 235, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.0546875 = fieldNorm(doc=235)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Knowledge organization for a global learning society: Proceedings of the 9th International ISKO Conference, 4-7 July 2006, Vienna, Austria. Hrsg.: G. Budin, C. Swertz u. K. Mitgutsch
- Type
- a
-
Lu, K.; Mao, J.: ¬An automatic approach to weighted subject indexing : an empirical study in the biomedical domain (2015)
0.00
0.0014647468 = product of:
0.0029294936 = sum of:
0.0029294936 = product of:
0.005858987 = sum of:
0.005858987 = weight(_text_:a in 4005) [ClassicSimilarity], result of:
0.005858987 = score(doc=4005,freq=6.0), product of:
0.053105544 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.046056706 = queryNorm
0.11032722 = fieldWeight in 4005, product of:
2.4494898 = tf(freq=6.0), with freq of:
6.0 = termFreq=6.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.0390625 = fieldNorm(doc=4005)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Abstract
- Subject indexing is an intellectually intensive process that has many inherent uncertainties. Existing manual subject indexing systems generally produce binary outcomes for whether or not to assign an indexing term. This does not sufficiently reflect the extent to which the indexing terms are associated with the documents. On the other hand, the idea of probabilistic or weighted indexing was proposed a long time ago and has seen success in capturing uncertainties in the automatic indexing process. One hurdle to overcome in implementing weighted indexing in manual subject indexing systems is the practical burden that could be added to the already intensive indexing process. This study proposes a method to infer automatically the associations between subject terms and documents through text mining. By uncovering the connections between MeSH descriptors and document text, we are able to derive the weights of MeSH descriptors manually assigned to documents. Our initial results suggest that the inference method is feasible and promising. The study has practical implications for improving subject indexing practice and providing better support for information retrieval.
- Type
- a
-
Lu, K.; Mao, J.; Li, G.: Toward effective automated weighted subject indexing : a comparison of different approaches in different environments (2018)
0.00
0.0014647468 = product of:
0.0029294936 = sum of:
0.0029294936 = product of:
0.005858987 = sum of:
0.005858987 = weight(_text_:a in 4292) [ClassicSimilarity], result of:
0.005858987 = score(doc=4292,freq=6.0), product of:
0.053105544 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.046056706 = queryNorm
0.11032722 = fieldWeight in 4292, product of:
2.4494898 = tf(freq=6.0), with freq of:
6.0 = termFreq=6.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.0390625 = fieldNorm(doc=4292)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Abstract
- Subject indexing plays an important role in supporting subject access to information resources. Current subject indexing systems do not make adequate distinctions on the importance of assigned subject descriptors. Assigning numeric weights to subject descriptors to distinguish their importance to the documents can strengthen the role of subject metadata. Automated methods are more cost-effective. This study compares different automated weighting methods in different environments. Two evaluation methods were used to assess the performance. Experiments on three datasets in the biomedical domain suggest the performance of different weighting methods depends on whether it is an abstract or full text environment. Mutual information with bag-of-words representation shows the best average performance in the full text environment, while cosine with bag-of-words representation is the best in an abstract environment. The cosine measure has relatively consistent and robust performance. A direct weighting method, IDF (Inverse Document Frequency), can produce quick and reasonable estimates of the weights. Bag-of-words representation generally outperforms the concept-based representation. Further improvement in performance can be obtained by using the learning-to-rank method to integrate different weighting methods. This study follows up Lu and Mao (Journal of the Association for Information Science and Technology, 66, 1776-1784, 2015), in which an automated weighted subject indexing method was proposed and validated. The findings from this study contribute to more effective weighted subject indexing.
- Type
- a
-
Braam, R.R.; Bruil, J.: Quality of indexing information : authors' views on indexing of their articles in chemical abstracts online CA-file (1992)
0.00
0.0014351527 = product of:
0.0028703054 = sum of:
0.0028703054 = product of:
0.005740611 = sum of:
0.005740611 = weight(_text_:a in 2638) [ClassicSimilarity], result of:
0.005740611 = score(doc=2638,freq=4.0), product of:
0.053105544 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.046056706 = queryNorm
0.10809815 = fieldWeight in 2638, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.046875 = fieldNorm(doc=2638)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Abstract
- Studies the quality of subject indexing by Chemical Abstracts Indexing Service by confronting authors with the particular indexing terms attributed to their computer, for 270 articles published in 54 journals, 5 articles out of each journal. Responses (80%) indicate the superior quality of keywords, both as content descriptors and as retrieval tools. Author judgements on these 2 different aspects do not always converge, however. CAS's indexing policy to cover only 'new' aspects is reflected in author's judgements that index lists are somewhat incomplete, in particular in the case of thesaurus terms (index headings). The large effort expanded by CAS in maintaining and using a subject thesuaurs, in order to select valid index headings, as compared to quick and cheap keyword postings, does not lead to clear superior quality of thesaurus terms for document description nor in retrieval. Some 20% of papers were not placed in 'proper' CA main section, according to authors. As concerns the use of indexing data by third parties, in bibliometrics, users should be aware of the indexing policies behind the data, in order to prevent invalid interpretations
- Type
- a
-
Hudon, M.: Conceptual compatibility in controlled language tools used to index and access the content of moving image collections (2004)
0.00
0.0014351527 = product of:
0.0028703054 = sum of:
0.0028703054 = product of:
0.005740611 = sum of:
0.005740611 = weight(_text_:a in 2655) [ClassicSimilarity], result of:
0.005740611 = score(doc=2655,freq=4.0), product of:
0.053105544 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.046056706 = queryNorm
0.10809815 = fieldWeight in 2655, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.046875 = fieldNorm(doc=2655)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Abstract
- Five controlled vocabularies currently used for content representation in collections of non art moving images were examined to determine their level of conceptual compatibility. Methods borrowed from previous research in the area of indexing language compatibility were used. Quantitative data and qualitative observations allowed us to estimate more precisely and realistically the actual degree of conceptual redundancy in these indexing languages. It was found that the conceptual overlap is high enough to justify the pursuit of research and development work an a common basic indexing and access language that could be used to name objects, events, categories of persons, and relations most frequently depicted in non art moving image collections.
- Type
- a
-
Chan, L.M.: Alphabetical arrangement and subject collocation in Library of Congress Subject Headings (1977)
0.00
0.001353075 = product of:
0.00270615 = sum of:
0.00270615 = product of:
0.0054123 = sum of:
0.0054123 = weight(_text_:a in 2268) [ClassicSimilarity], result of:
0.0054123 = score(doc=2268,freq=2.0), product of:
0.053105544 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.046056706 = queryNorm
0.10191591 = fieldWeight in 2268, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.0625 = fieldNorm(doc=2268)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Type
- a
-
Iivonen, M.: ¬The impact of the indexing environment on interindexer consistency (1990)
0.00
0.001353075 = product of:
0.00270615 = sum of:
0.00270615 = product of:
0.0054123 = sum of:
0.0054123 = weight(_text_:a in 4779) [ClassicSimilarity], result of:
0.0054123 = score(doc=4779,freq=2.0), product of:
0.053105544 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.046056706 = queryNorm
0.10191591 = fieldWeight in 4779, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.0625 = fieldNorm(doc=4779)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Type
- a
-
Prasher, R.G.: Evaluation of indexing system (1989)
0.00
0.001353075 = product of:
0.00270615 = sum of:
0.00270615 = product of:
0.0054123 = sum of:
0.0054123 = weight(_text_:a in 4998) [ClassicSimilarity], result of:
0.0054123 = score(doc=4998,freq=2.0), product of:
0.053105544 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.046056706 = queryNorm
0.10191591 = fieldWeight in 4998, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.0625 = fieldNorm(doc=4998)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Type
- a
-
Ladewig, C.; Rieger, M.: Ähnlichkeitsmessung mit und ohne aspektische Indexierung (1998)
0.00
0.001353075 = product of:
0.00270615 = sum of:
0.00270615 = product of:
0.0054123 = sum of:
0.0054123 = weight(_text_:a in 2526) [ClassicSimilarity], result of:
0.0054123 = score(doc=2526,freq=2.0), product of:
0.053105544 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.046056706 = queryNorm
0.10191591 = fieldWeight in 2526, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.0625 = fieldNorm(doc=2526)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Type
- a
-
Gretz, M.; Thomas, M.: Indexierungen in biomedizinischen Literaturdatenbanken : eine vergleichende Analyse (1991)
0.00
0.0011839407 = product of:
0.0023678814 = sum of:
0.0023678814 = product of:
0.0047357627 = sum of:
0.0047357627 = weight(_text_:a in 5104) [ClassicSimilarity], result of:
0.0047357627 = score(doc=5104,freq=2.0), product of:
0.053105544 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.046056706 = queryNorm
0.089176424 = fieldWeight in 5104, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.0546875 = fieldNorm(doc=5104)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Type
- a
-
Iivonen, M.; Kivimäki, K.: Common entities and missing properties : similarities and differences in the indexing of concepts (1998)
0.00
0.0010148063 = product of:
0.0020296127 = sum of:
0.0020296127 = product of:
0.0040592253 = sum of:
0.0040592253 = weight(_text_:a in 3074) [ClassicSimilarity], result of:
0.0040592253 = score(doc=3074,freq=2.0), product of:
0.053105544 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.046056706 = queryNorm
0.07643694 = fieldWeight in 3074, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.046875 = fieldNorm(doc=3074)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Type
- a
