Describes a study that examined the ability of the dBase database management system to perform secondary key retrieval on multivalued data items. The results are presented as time cost relative to the number of matching records, and situations in which a different management system might be appropriate are identified. (CLB)

A comparison of ERIC and LISA (Library and Information Science Abstracts) indexing of the three journals--Online, Online Review, and Database--revealed some differences but more similarities in number of terms per article and concepts per article. A vocabulary which distinguished the field of online searching did emerge. (Author/EM)

Explains seven types of subject descriptions commonly used in databases--hierarchical classification, category codes, subject headings, descriptors, faceted classification, post-controlled vocabulary, and natural language--and describes specific search techniques for taking advantage of the strengths of particular types of vocabularies. An overall…

Investigates methods of compressing headings identified by MARC subfield codes to reduce the size of browsable displays. An argument is made for sorting subdivisions by a conceptual, rather than an alphabetical, approach to present efficient browsable displays and relieve the user of the burden of data organization. (14 references) (Author/CLB)

Describes the organization of the descriptors used in the ERIC database to indicate age, educational, and student levels, and suggests appropriate search strategies for the retrieval of information on specific age groups. (CLB)

Description of bibliographic databank produced by the H. W. Wilson Company covers databases (bibliographical, directory, forthcoming); the WILSONLINE search system (search statement formulation, identifying search terms, other search features); print options; search management features; performance, documentation, and assistance; costs; and…

Examines the distribution of bibliographic records in online bibliographic databases using 14 different search topics on DIALOG. Discusses the presence of duplicate records and problems with lexical ambiguity, and concludes that the number of databases needed for searches with varying complexities of search strategies is much more topic dependent…

Describes storing of "hedges"--lists of terms on specific subjects--for use in responding to repeated search requests which cannot be retrieved via existing controlled vocabulary. Use of hedges at National Library of Medicine and National Institutes of Health Library, frequently used examples, and Excerpta Medica hedges are highlighted.…

Offers 20 multiple choice questions to test the reader's knowledge of characteristics of the ERIC online database. The levels of expertise indicated by scores obtained on the quiz are given and suggested further readings are provided. (CLB)

Identifies and describes online databases containing references to materials on artificial intelligence, robotics, and expert systems, and compares them in terms of scope and usage. Recommendations for conducting online searches on artificial intelligence and related fields are offered. (CLB)

Describes a study funded by the Commission of the European Community that applied document retrieval algorithms to the "Excerpta Medica" database using the EMTREE thesaurus. Nonhierarchical relations were added to enrich the thesaurus, and document ranking is discussed in terms of the conceptual distance between the documents and the…

Describes a method for measuring research information from thematic references such as headings and subheadings that are used in indexing, cataloging, and online searching, using the Rasch model as the measuring instrument. Discusses results of a search of anesthesiology in the Medline database that was used as a case study. (Author/LRW)

Describes the holdings and services provided by the Roper Center, the largest archive of survey data in the world. Explains the structure of and topics included in the online database, and discusses fees, membership opportunities, and future plans for the center. A sidebar by Burns W. Roper is included. (CLB)

Describes and compares the nine online databases that index the Washington Post. Points of comparison include materials that are excluded from the database, citations to excluded materials, citation formats, search vocabularies and strategies, full-text searching, cross-file searching, and search costs. (5 references) (CLB)

This discussion of the structure of online databases and the structure of related subject disciplines focuses on terms used in a book about tropical diseases and terms used in the MEDLINE database for articles on these diseases. Matrices used are explained and Medical Subject Heading (MeSh) terms are examined. (16 references) (LRW)