title: A performance and failure analysis of SAPHIRE with a MEDLINE test collection.
abstract: OBJECTIVE
  Assess the performance of the SAPHIRE automated information retrieval system.
  
  
  METHODS
  Comparative study of automated and human searching of a MEDLINE test collection.
  
  
  METHODS
  Recall and precision of SAPHIRE were compared with those attributes of novice physicians, expert physicians, and librarians for a test collection of 75 queries and 2,334 citations. Failure analysis assessed the efficacy of the Metathesaurus as a concept vocabulary; the reasons for retrieval of nonrelevant articles and nonretrieval of relevant articles; and the effect of changing the weighting formula for relevance ranking of retrieved articles.
  
  
  RESULTS
  Recall and precision of SAPHIRE were comparable to those of both physician groups, but less than those of librarians.
  
  
  CONCLUSIONS
  The current version of the Metathesaurus, as utilized by SAPHIRE, was unable to represent the conceptual content of one-fourth of physician-generated MEDLINE queries. The most likely cause for retrieval of nonrelevant articles was the presence of some or all of the search terms in the article, with frequencies high enough to lead to retrieval. The most likely cause for nonretrieval of relevant articles was the absence of the actual terms from the query, with synonyms or hierarchically related terms present instead. There were significant variations in performance when SAPHIRE's concept-weighing formulas were modified.
authors.affiliation: Biomedical Information Communication Center, Oregon Health Sciences University, Portland 97201, USA.
authors.forename: W R
authors.initials: WR
authors.lastname: Hersh
authors.forename: D H
authors.initials: DH
authors.lastname: Hickam
authors.forename: R B
authors.initials: RB
authors.lastname: Haynes
authors.forename: K A
authors.initials: KA
authors.lastname: McKibbon
mesh_terms: D000043:Abstracting and Indexing / Q000379:methods*; D000465:Algorithms; D016247:Information Storage and Retrieval; D016245:Librarians; D016239:MEDLINE; D010820:Physicians; D017432:Unified Medical Language System