Search (4 results, page 1 of 1)

  • × theme_ss:"Indexierungsstudien"
  • × year_i:[1980 TO 1990}
  1. Azubuike, A.A.; Umoh, J.S.: Computerized information storage and retrieval systems (1988) 0.02 
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  2. Boyce, B.R.; McLain, J.P.: Entry point depth and online search using a controlled vocabulary (1989) 0.02 
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    Abstract
    The depth of indexing, the number of terms assigned on average to each document in a retrieval system as entry points, has a significantly effect on the standard retrieval performance measures in modern commercial retrieval systems, just as it did in previous experimental work. Tests on the effect of basic index search, as opposed to controlled vocabulary search, in these real systems are quite different than traditional comparisons of free text searching with controlled vocabulary searching. In modern commercial systems the controlled vocabulary serves as a precision device, since the strucure of the default for unqualified search terms in these systems requires that it do so.
  3. Chartron, G.; Dalbin, S.; Monteil, M.-G.; Verillon, M.: Indexation manuelle et indexation automatique : dépasser les oppositions (1989) 0.01 
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    Abstract
    Report of a study comparing 2 methods of indexing: LEXINET, a computerised system for indexing titles and summaries only; and manual indexing of full texts, using the thesaurus developed by French Electricity (EDF). Both systems were applied to a collection of approximately 2.000 documents on artifical intelligence from the EDF data base. The results were then analysed to compare quantitative performance (number and range of terms) and qualitative performance (ambiguity of terms, specificity, variability, consistency). Overall, neither system proved ideal: LEXINET was deficient as regards lack of accessibility and excessive ambiguity; while the manual system gave rise to an over-wide variation of terms. The ideal system would appear to be a combination of automatic and manual systems, on the evidence produced here.
  4. Prasher, R.G.: Evaluation of indexing system (1989) 0.01 
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    Abstract
    Describes information system and its various components-index file construstion, query formulation and searching. Discusses an indexing system, and brings out the need for its evaluation. Explains the concept of the efficiency of indexing systems and discusses factors which control this efficiency. Gives criteria for evaluation. Discusses recall and precision ratios, as also noise ratio, novelty ratio, and exhaustivity and specificity and the impact of each on the efficiency of indexing system. Mention also various steps for evaluation.

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