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  • × author_ss:"Hickam, D.H."
  1. Hersh, W.R.; Hickam, D.H.: ¬A comparison of two methods for indexing and retrieval from a full-text medical database (1992) 0.00 
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    Abstract
    Reports results of a study of 2 information retrieval systems on a 2.000 document full text medical database. The first system, SAPHIRE, features concept based automatic indexing and statistical retrieval techniques, while the second system, SWORD, features traditional word based Boolean techniques, 16 medical students at Oregon Health Sciences Univ. each performed 10 searches and their results, recorded in terms of recall and precision, showed nearly equal performance for both systems. SAPHIRE was also compared with a version of SWORD modified to use automatic indexing and ranked retrieval. Using batch input of queries, the latter method performed slightly better
    Type
    a
  2. Hersh, W.R.; Hickam, D.H.: ¬An evaluation of interactive Boolean and natural language searching with an online medical textbook (1995) 0.00 
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    Abstract
    Few studies have compared the interactive use of Boolean and natural language search systems. Studies the use of 3 retrieval systems by senior medical students searching on queries generated by actual physicians in a clinical setting. The searchers were randomized to search on 2 or 3 different retrieval systems: a Boolean system, a word-based natural language system, and a concept-based natural language system. Results showed no statistically significant differences in recall or precision among the 3 systems. Likewise, there is no user preference for any system over the other. The study revealed problems with traditional measures of retrieval evaluation when applied to the interactive search setting
    Type
    a
  3. Hersh, W.R.; Pentecost, J.; Hickam, D.H.: ¬A task-oriented approach to retrieval system evaluation (1995) 0.00 
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    Abstract
    There is a need for improved methods to evaluate the effectiveness of end user information retrieval systems. Performs a task oriented assessment of 2 MEDLINE searching systems, one which promotes Boolean searching on human indexed thesaurus terms and the other natural language searching on words in the title, abstract, and indexing terms. Each was used by medical students to answer clinical questions. Students were able to use each system successfully, with no significant differences in questions correctly answered, time taken, relevant articles retrieved, or user satisfaction between the systems. This approach to evaluation was successful in measuring effectiveness of system use and demonstrates that both types of systems can be used equally well with minimal training
    Type
    a

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