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Keen, E.M.: Aspects of computer-based indexing languages (1991)
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- Abstract
- Comments on the relative rarity of research articles on theoretical aspects of subject indexing in computerised retrieval systems and the predominance of articles on software packages and hardware. Concludes that controlled indexing still has a future but points to major differences from the past
- Source
- Computers in libraries international 91. Proceedings of the 5th Annual Conference on Computers in Libraries, London, February 1991
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Keen, E.M.: Some aspects of proximity searching in text retrieval systems (1992)
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- Abstract
- Describes and evaluates the proximity search facilities in external online systems and in-house retrieval software. Discusses and illustrates capabilities, syntax and circumstances of use. Presents measurements of the overheads required by proximity for storage, record input time and search time. The search strategy narrowing effect of proximity is illustrated by recall and precision test results. Usage and problems lead to a number of design ideas for better implementation: some based on existing Boolean strategies, one on the use of weighted proximity to automatically produce ranked output. A comparison of Boolean, quorum and proximate term pairs distance is included
- Source
- Journal of information science. 18(1992), S.89-98
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Armstrong, C.J.; Keen, E.M.: Workbook for NEPHIS and KWAC : Microcomputer printed subject indexes teaching package, Pt.1 (1982)
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Armstrong, C.J.; Keen, E.M.: Manual for teaching NEPHIS and KWAC : Microcomputer printed subject indexes teaching package, Pt.2 (1982)
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Keen, E.M.: Laboratory tests of manual systems (1981)
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Keen, E.M.; Hartley, R.J.: Phrase processing in text retrieval (1994)
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- Abstract
- After introducing types of records, queries and text processing options, the features needed in software for phrase processing are identified and different approaches in current text retrieval research in the Text Retrieval Conference (TREC) projects are enumerated. Then follow eight observations on issues in phrase searching relating both to practice and to research, giving the authors' selection of crucial and controversial issues, supported by 21 references
- Source
- Journal of document and text management. 2(1994) no.1, S.23-34
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Keen, E.M.: Designing and testing an interactive ranked retrieval system for professional searchers (1994)
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- Abstract
- Reports 3 explorations of ranked system design. 2 tests used a 'cystic fibrosis' test collection with 100 queries. Experiment 1 compared a Boolean with a ranked interactive system using a subject qualified trained searcher, and reporting recall and precision results. Experiment 2 compared 15 different ranked match algorithms in a batch mode using 2 test collections, and included some new proximate pairs and term weighting approaches. Experiment 3 is a design plan for an interactive ranked prototype offering mid search algorithm choices plus other manual search devices (such as obligatory and unwanted terms), as influenced by thinking aloud comments from experiment 1. Concludes that, in Boolean versus ranked using inverse collection frequency, the searcher inspected more records on ranked than Boolean and so achieved a higher recall but lower precision; however, the presentation order of the relevant records, was, on average, very similar in both systems. Concludes also that: query reformulation was quite strongly practised in ranked searching but does not appear to have been effective; the term pairs proximate weithing methods in experiment 2 enhanced precision on both test collections when used with inverse collection frequency weighting (ICF); and the design plan for an interactive prototype adds to a selection of match algorithms other devices, such as obligatory and unwanted term marking, evidence for this being found from think aloud comments
- Source
- Journal of information science. 20(1994) no.6, S.389-398
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Keen, E.M.: On the generation and searching of entries in printed subject indexes (1977)
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- Source
- Journal of documentation. 33(1977) no.1, S.15-45
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Keen, E.M.: ¬The Aberystwyth index languages tests (1973)
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- Source
- Journal of documentation. 29(1973), S.1-35
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Keen, E.M.: Presenting results of experimental retrieval comparisons (1992)
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- Abstract
- Methods of calculating and presenting results from experimental retrieval comparisons are considered and illustrated by some new laboratory results. The measures used centre on Recall and Precision. Topics of data calculation, single value measures, benchmark results, data aggregation, statistical significance, and the presentation of performance differences are discussed. User-oriented presentations can be used to simulate different needs such as high or low levels of Recall. Several methods of retrieval cutoff can be used as the control variable, but the document cutoff is the most useful. 2 difficult performance comparisons are illustrated: Boolean versus ranked output retrieval and non-iterative versus relevance feedback
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Keen, E.M.: Interactive ranked retrieval (1995)
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- Abstract
- Reports the design, building and testing of the Interactive Ranked Output Search Engine (IROSE), which includes as the main features: query reformulation, ranked output match options, field bias options, marking of must, minus, and truncated suppressed terms. Both DOS and Windows versions of IROSE were constructed and laboratory search tests were performed using 3 test collections of records with queries and relevance jedgements in the subject area of cystic fibrosis, library and information and current affairs. Concludes that there is substantial evidence of the quality of this approach to information retrieval and future tests are needed to redefine and improve the optionality and move to semi operational testing
