904 resultados para Study approaches and experimental validation


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"United States Department of Agriculture in cooperation with the South Carolina Agricultural Experiment Station."

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Print issues ceased with v. 339, no.3 (Dec. 2011)

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"November 1988."

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Catalogue of the officers, faculty and students for the academic year 1859-60 / Ypsilanti Union School -- Biennial catalogue and circular of the officers, teachers and pupils of the Ypsilanti Union Seminary : together with the courses of study, rules and regulations for the school year 1868-69 -- Union Lyceum, public, Ypsilanti Seminary, Saturday eve., Feb. 26, '70 [program] : order of exercises -- Ninth annual commencement of the Ypsilanti Union Seminary, Friday evening, June 24, 1870 -- Circular containing organization, courses of study and rules and regulations of the public schools of Ypsilanti, Michigan, 1885 -- Circular of the Ypsilanti high school for the academic year 1885-86 -- Annual report and circular containing courses of study of the public schools of Ypsilanti, Michigan, 1892 -- Announcement, Ypsilanti public schools, 1892-93 -- Circular of information, August, 1895 / Ypsilanti High School -- Catalog of the officers, instructors, and students of the Ypsilanti High School for the school year 1898-99 -- Catalog of the officers, instructors, and students of the Ypsilanti High School, for the school year 1899-1900 -- Catalog of the officers, teachers, and students of the Ypsilanti High School for the school year 1900-1901 -- Commemoration exercises celebrating the close of the nineteenth century high school hall, Thursday evening, Dec. 20, 1900 / Ypsilanti High School -- Annual report of the Superintendent of the public schools of Ypsilanti, Michigan for the school year 1908-1909 -- The public schools, Ypsilanti, Michigan : course of study, rules and regulations, reports for 1910-11 and general information -- Annual catalogue, 1911-12 / high school, Ypsilanti, Michigan.

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The data structure of an information system can significantly impact the ability of end users to efficiently and effectively retrieve the information they need. This research develops a methodology for evaluating, ex ante, the relative desirability of alternative data structures for end user queries. This research theorizes that the data structure that yields the lowest weighted average complexity for a representative sample of information requests is the most desirable data structure for end user queries. The theory was tested in an experiment that compared queries from two different relational database schemas. As theorized, end users querying the data structure associated with the less complex queries performed better Complexity was measured using three different Halstead metrics. Each of the three metrics provided excellent predictions of end user performance. This research supplies strong evidence that organizations can use complexity metrics to evaluate, ex ante, the desirability of alternate data structures. Organizations can use these evaluations to enhance the efficient and effective retrieval of information by creating data structures that minimize end user query complexity.