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The theory underlying the analysis of covariance is outlined and certain common misuses delineated. The technique is severely limited in its applications while invalid applications may lead to false inferences. It is shown that it cannot make non‐experimental designs experimental and that invalid assumptions regarding the slope of the regression lines may also lead the educational researcher astray. 相似文献
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Kevin P. Scheibe Brian E. Mennecke Andy Luse 《Decision Sciences Journal of Innovative Education》2007,5(1):21-42
Computing technology augments learning in education in a number of ways. One particular method uses interactive programs to demonstrate complex concepts. The purpose of this article is to examine one type of interactive learning technology, the transparent engine. The transparent engine allows instructors and students to view and directly interact with educational concepts such as Web‐enabled software development. The article first presents a framework describing transparent engines. The framework details four types of transparent engines: (1) enactive mastery/manipulatable, (2) enactive mastery/nonmanipulatable, (3) vicarious experience/manipulatable, and (4) vicarious experience/nonmanipulatable. Following this, we present the results of an experiment designed to examine this framework by testing its predictions for one quadrant, vicarious experience/nonmanipulatable. The results support the framework in that students taught concepts with the aid of the vicarious experience/nonmanipulatable transparent engine had significantly higher domain‐specific self‐efficacy compared to those taught the same concepts without this tool. 相似文献
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This article reports findings from a multiphase analysis of demand-driven acquisitions (DDA) within the academic research library setting. Evaluating local collections within the context of Trueswell's (1969) often-cited 80/20 Rule, phase one of this study illustrates the deficiencies of a just-in-case approach to building library collections. Following from this, phase two evaluates the viability of DDA as the just-in-time collection-building solution librarians have sought as an answer to low-use titles that plague most academic library collections. Supported by 16?months of data, this study scrutinizes the comparative value of DDA against traditionally acquired titles along two key dimensions—the subject-matter profile of purchases and their overall usage levels. Further, the concept of a utility as value paradigm, as well as a purchase-use equilibrium for library collections, provide a theoretical framework in which the relative value of DDA is assessed. From a content, or subject-matter, perspective, this study finds negligible deviation in those purchasing patterns associated with DDA when compared with traditionally-acquired materials. At the same time, DDA titles experience much higher levels of use and are, therefore, associated with markedly lower cost-per-use figures and greater overall value. 相似文献