Describes a genetic algorithm (GA) that assigns weights to query terms in a ranked-output document retrieval system. Experiments showed the GA often found weights slightly superior to those produced by deterministic weighting (F4). Many times, however, the two methods gave the same results and sometimes the F4 results were superior, indicating…

Reviews databases providing information on published, standardized and unpublished, non-standardized test instruments: Educational Testing Service File, Mental Measurements Yearbook Database, Dissertation Abstracts Online, ERIC, and Psychological Abstracts. Search strategies, search examples, and a summary chart of searchable fields for test…

Compares the cost and retrieval effectiveness of three online information services when searching is conducted primarily on one database. The costs of searching, profile storage, printing, document delivery, surcharges, and updates are identified for WISE, BRS, and DIALOG. (FM)

Used the INSPEC database to compare two search options available on the DIALOG system for the purpose of establishing criteria to determine which of the alternatives would prove more cost effective than the other. (FM)

Analyzed data gathered from 78 online searchers to examine attitudes toward the use of DIALOG and SDC's ORBIT command languages. It was found that most users preferred DIALOG for ease of use. Twenty sources are listed. (FM)

Compares the user features of an in-house online search system based on automatic indexing with those of commercial search services, considering specific user types, file structure and applications, and the basic operating system environment. (FM)

Of 25 databases available on both DIALOG and European Space Agency's Information Retrieval Service (ESA/IRS), five are less expensive on DIALOG by three price factors (online connect charges, online displays of citations, offline prints); five are less expensive on ESA/IRS; remaining 15 represent mixed bag (connect charges offset citation…

Outlines major online agricultural information services--agricultural databases, databases with agricultural services, educational databases in agriculture--noting services provided, access to the database, and costs. Benefits of online agricultural database sources (availability of agricultural marketing, weather, commodity prices, management…

Examines use of online access to bibliographic files in library reference service, focusing on two systems: OCLC and Research Libraries Information Network (RLIN). The development and current status of each system, differences between systems, search examples, user expectations, and advantages of online access are noted. Twenty references are…

Compares database update currency, number of hits, elapsed time, number of offline prints or online types, offline print turnaround time, vendor rates, total search cost, and discounted search cost based on vendor discount rates for five simple searches run on three major commercial vendors' online systems. (CWM)

Describes a study conducted to identify the differences among the searches of users of online systems who have different amounts of overall experience, and the differences between the searches of persons with and without experience on the database being searched. Twenty-five references are cited. (FM)

Three firms which offer online information retrieval are compared. The firms are Lockheed Information Service, System Development Corporation and the Western Research Application Center. Comparison tables provide information such as hours accessible, coverage, file update, search elements and cost figures for 15 data bases. In addition, general…

Presents survey of two groups of databases covering patent literature: patent literature only and general literature that includes patents relevant to subject area of database. Description of databases and comparison tables for patent and general databases (cost, country coverage, years covered, update frequency, file size, and searchable data…

Presents a preliminary analysis of differences between Disclosure II and Predicasts Annual Reports Abstracts (databases which provide online company information) as available from DIALOG Information Retrieval Services. Sources of online information, duplication of information, company coverage, currency of coverage, accuracy of coverage, and…

Provides exploration into types of numeric databases available (also known as source databases, nonbibliographic databases, data-files, data-banks, fact banks); examines differences and similarities between bibliographic and numeric databases; identifies disciplines that utilize numeric databases; and surveys representative examples in the…