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This article demonstrates the use of a new class of model‐free cumulative sum (CUSUM) statistics to detect person fit given the responses to a linear test. The fundamental statistic being accumulated is the likelihood ratio of two probabilities. The detection performance of this CUSUM scheme is compared to other model‐free person‐fit statistics found in the literature as well as an adaptation of another CUSUM approach. The study used both simulated responses and real response data from a large‐scale standardized admission test. 相似文献
215.
Oxygen uptake kinetics in children and adults after the onset of moderate-intensity exercise 总被引:1,自引:0,他引:1
The literature suggests that the oxygen uptake (VO2) response to the onset of moderate-intensity exercise may be both mature from childhood and independent of sex. Yet the cardiorespiratory response to exercise and the metabolic profile of the muscle appear to change with growth and development and to differ between the sexes. The aim of this study was to investigate further changes in the VO2 kinetic response with age and sex. Participants completed a series of no less than four step change transitions, from unloaded pedalling to a constant work rate corresponding to 80% of their previously determined ventilatory threshold. Each participant's breath-by-breath responses were interpolated to 1 s intervals, time aligned and then averaged. A single exponential model that included a time delay was used to analyse the averaged response following phase 1 (15 s). Participants with parameter confidence intervals more than +/- 5 s were removed from the sample; the results for the remaining 13 men and 12 women (age 19-26 years), 12 boys and 11 girls (age 11-12 years) were used for statistical analysis. Children had a significantly shorter time constant than adults, both for males (19.0+/-2.0 and 27.9+/-8.6 s respectively; P<0.01) and females (21.0+/-5.5 and 26.0+/-4.5 s respectively; P<0.05). There were no significant differences in the time constant between the sexes for either adults or children (P>0.05). A significant relationship between the time constant and peak VO2 was found only in adult males (P<0.05). A shorter time constant in children may reflect an enhanced potential for oxidative metabolism. 相似文献
216.
Points of convergence: seamless long-term access to digital publications and archival records at library and archives Canada 总被引:1,自引:0,他引:1
In 2004, Canada’s national library and national archives merged to form Library and Archives Canada (LAC). LAC has become more than the sum of its parts, creating synergies between library and archives collections and services, realizing efficiencies and satisfying user demands for seamless access to all holdings. LAC has already created and launched Fed Search, an online search tool that provides clients with single-search access to library, archives and online collections. LAC is in the process of building a Trusted Digital Repository that will combine ingest, preservation, management and dissemination services for archives and library collections. 相似文献
217.
Service-learning is defined as a teaching/learning method that connects meaningful community service with academic learning, personal growth, and civic responsibility. In this study, conducted at an American University, we describe a cascading model of integrating early childhood teacher education and service-learning for preservice teachers who then implemented the combined model in their field classrooms with young children. Examples of the projects from the two cohorts of 25 and 26 undergraduate students are provided. We demonstrate that service-learning projects provide an instructional avenue for preservice students to teach in an integrated and/or experiential manner in their field classrooms and discuss why service-learning is an appropriate and meaningful strategy to use with preservice teachers and children. 相似文献
218.
Norris A. Armstrong Carolyn S. Wallace Shu-Mei Chang 《Research in Science Education》2008,38(4):483-499
This study used both quantitative and qualitative analyses to examine the influence of written arguments on learning in a
college level introductory biology class and the types of metacognition employed by students while writing. Comparison of
a treatment and control group indicates that the writing assignments used had minimal impact on overall content learning as
measured by conventional exams. Subsequent interviews and think-aloud protocols with a subset of students indicated that writing
arguments had the potential to foster learning through forward and backward search strategies. However, few of the students
took advantage of this opportunity to use metacognitive skills. This study suggests that preparing written arguments is not
sufficient, by itself, to have a reliable effect on student learning and is consistent with the view that students must be
explicitly taught when and how to use different metacognitive strategies. 相似文献
219.
Content area literacy has an important role in helping students understand content in specific disciplines, such as mathematics. Although the strategies are not unique to each individual content area, they are often adapted for use in a specific discipline. For example, mathematicians use mathematical language to make sense of new ideas and information and to organize that information in a specialized way. Content literacy strategies can help mathematics students accomplish these goals. In this article, we will discuss six practical strategies to help build students' content skills in the mathematics classroom and they are: the Frayer model, question generation, visual supports, think-alouds, writing to learn, and text reading. 相似文献