Search (49 results, page 1 of 3)

  • × year_i:[1980 TO 1990}
  • × theme_ss:"Retrievalstudien"
  1. Fuhr, N.; Niewelt, B.: ¬Ein Retrievaltest mit automatisch indexierten Dokumenten (1984) 0.05 
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    Date
    20.10.2000 12:22:23
    Type
    a
  2. Saracevic, T.: On a method for studying the structure and nature of requests in information retrieval (1983) 0.04 
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    Pages
    S.22-25
    Type
    a
  3. Hodges, P.R.: Keyword in title indexes : effectiveness of retrieval in computer searches (1983) 0.03 
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    Abstract
    A study was done to test the effectiveness of retrieval using title word searching. It was based on actual search profiles used in the Mechanized Information Center at Ohio State University, in order ro replicate as closely as possible actual searching conditions. Fewer than 50% of the relevant titles were retrieved by keywords in titles. The low rate of retrieval can be attributes to three sources: titles themselves, user and information specialist ignorance of the subject vocabulary in use, and to general language problems. Across fields it was found that the social sciences had the best retrieval rate, with science having the next best, and arts and humanities the lowest. Ways to enhance and supplement keyword in title searching on the computer and in printed indexes are discussed.
    Date
    14. 3.1996 13:22:21
    Type
    a
  4. Sievert, M.E.; McKinin, E.J.: Why full-text misses some relevant documents : an analysis of documents not retrieved by CCML or MEDIS (1989) 0.02 
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    Abstract
    Searches conducted as part of the MEDLINE/Full-Text Research Project revealed that the full-text data bases of clinical medical journal articles (CCML (Comprehensive Core Medical Library) from BRS Information Technologies, and MEDIS from Mead Data Central) did not retrieve all the relevant citations. An analysis of the data indicated that 204 relevant citations were retrieved only by MEDLINE. A comparison of the strategies used on the full-text data bases with the text of the articles of these 204 citations revealed that 2 reasons contributed to these failure. The searcher often constructed a restrictive strategy which resulted in the loss of relevant documents; and as in other kinds of retrieval, the problems of natural language caused the loss of relevant documents.
    Date
    9. 1.1996 10:22:31
  5. Bernstein, L.M.; Williamson, R.E.: Testing of a natural language retrieval system for a full text knowledge base (1984) 0.00 
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    Type
    a
  6. Regazzi, J.J.: Evaluating indexing systems : a review after Cranfield (1980) 0.00 
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  7. Hartley, D.: ¬A 'laboratory' method for the comparison of retrieval effectiveness in manual and online searching (1984) 0.00 
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    Abstract
    The paper provides a brief review of a number of published studies of the comparative retrieval effectiveness of manual and online searching. A description of a 'laboratory' approach to the comparison of retrieval effectiveness of manual and online searching is presented. Results, which have been obtained, using this approach are presented. it is suggested that the methodology could be adopted easily elsewhere
    Type
    a
  8. Kilgour, F.G.: Retrieval on information from computerized book texts (1989) 0.00 
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    Source
    Academic librarianship past, present, and future. A festschrift in honor of David Kaser: Ed. by J. Richardson u. J.Y. Davis
    Type
    a
  9. Lochbaum, K.E.; Streeter, A.R.: Comparing and combining the effectiveness of latent semantic indexing and the ordinary vector space model for information retrieval (1989) 0.00 
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    Abstract
    A retrievalsystem was built to find individuals with appropriate expertise within a large research establishment on the basis of their authored documents. The expert-locating system uses a new method for automatic indexing and retrieval based on singular value decomposition, a matrix decomposition technique related to the factor analysis. Organizational groups, represented by the documents they write, and the terms contained in these documents, are fit simultaneously into a 100-dimensional "semantic" space. User queries are positioned in the semantic space, and the most similar groups are returned to the user. Here we compared the standard vector-space model with this new technique and found that combining the two methods improved performance over either alone. We also examined the effects of various experimental variables on the system`s retrieval accuracy. In particular, the effects of: term weighting functions in the semantic space construction and in query construction, suffix stripping, and using lexical units larger than a a single word were studied.
    Type
    a
  10. Dillon, M.: Enhanced bibliographic record retrieval experiments (1989) 0.00 
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  11. Feng, S.: ¬A comparative study of indexing languages in single and multidatabase searching (1989) 0.00 
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    Abstract
    An experiment was conducted using 3 data bases in library and information science - Library and Information Science Abstracts (LISA), Information Science Abstracts and ERIC - to investigate some of the main factors affecting on-line searching: effectiveness of search vocabularies, combinations of fields searched, and overlaps among databases. Natural language, controlled vocabulary and a mixture of natural language and controlled terms were tested using different fields of bibliographic records. Also discusses a comparative evaluation of single and multi-data base searching, measuring the overlap among data bases and their influence upon on-line searching.
    Type
    a
  12. Robertson, S.E.: ¬The methodology of information retrieval experiment (1981) 0.00 
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  13. Rijsbergen, C.J. van: Retrieval effectiveness (1981) 0.00 
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  14. Belkin, N.J.: Ineffable concepts in information retrieval (1981) 0.00 
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  15. Tague, J.M.: ¬The pragmatics of information retrieval experimentation (1981) 0.00 
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  16. Barraclough, E.D.: Opportunities for testing with online systems (1981) 0.00 
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  17. Keen, E.M.: Laboratory tests of manual systems (1981) 0.00 
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  18. Oddy, R.N.: Laboratory tests : automatic systems (1981) 0.00 
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  19. Heine, M.D.: Simulation, and simulation experiments (1981) 0.00 
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  20. Cooper, W.S.: Gedanken experimentation : an alternative to traditional system testing? (1981) 0.00 
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