排序方式： 共有74条查询结果，搜索用时 15 毫秒
51.
张勤 《成都体育学院学报》2006,32(4):125-128
从课程视角分析了体育课程内容在纵向组织过程中的三个基本设计向度(顺序性、连续性、纵向关联),并基于对这三个基本设计向度的研究,分别提出了在体育课程内容的纵向组织中应注意的问题及其相应的运用方法. 相似文献
52.
Eigentaste: A Constant Time Collaborative Filtering Algorithm 总被引：32，自引：2，他引：30
Eigentaste is a collaborative filtering algorithm that uses universal queries to elicit real-valued user ratings on a common set of items and applies principal component analysis (PCA) to the resulting dense subset of the ratings matrix. PCA facilitates dimensionality reduction for offline clustering of users and rapid computation of recommendations. For a database of n users, standard nearest-neighbor techniques require O(n) processing time to compute recommendations, whereas Eigentaste requires O(1) (constant) time. We compare Eigentaste to alternative algorithms using data from Jester, an online joke recommending system.Jester has collected approximately 2,500,000 ratings from 57,000 users. We use the Normalized Mean Absolute Error (NMAE) measure to compare performance of different algorithms. In the Appendix we use Uniform and Normal distribution models to derive analytic estimates of NMAE when predictions are random. On the Jester dataset, Eigentaste computes recommendations two orders of magnitude faster with no loss of accuracy. Jester is online at: http://eigentaste.berkeley.edu 相似文献
53.
Mark J. Gierl 《Educational Measurement》2005,24(1):3-14
In this paper I describe and illustrate the Roussos-Stout (1996) multidimensionality-based DIF analysis paradigm, with emphasis on its implication for the selection of a matching and studied subtest for DIF analyses. Standard DIF practice encourages an exploratory search for matching subtest items based on purely statistical criteria, such as a failure to display DIF. By contrast, the multidimensional DIF paradigm emphasizes a substantively-informed selection of items for both the matching and studied subtest based on the dimensions suspected of underlying the test data. Using two examples, I demonstrate that these two approaches lead to different interpretations about the occurrence of DIF in a test. It is argued that selecting a matching and studied subtest, as identified using the DIF analysis paradigm, can lead to a more informed understanding of why DIF occurs. 相似文献
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55.
Alexandre J. S. Morin Jean-Sébastien Boudrias Herbert W. Marsh Isabelle Madore Pascale Desrumaux 《Structural equation modeling》2016,23(3):438-454
Morin and Marsh (2015) proposed a methodological framework to disentangle shape and level effects in latent profile analyses. We discuss limitations of this framework (based on a logic similar to that of higher-order measurement models), and suggest that these limitations are easily solved by a more thorough examination of the variable-centered measurement models underlying profile indicators. This study presents complementary variable- and person-centered approaches aiming to assess the dimensionality of psychometric constructs. Psychometric measures often assess separate conceptually-related facets of global overarching constructs, based on the assumption that these overarching constructs exist as global entities including specificities mapped by the facets. The framework proposed here explicitly models this dimensionality in both variable- and person-centered analyses. To illustrate this revised psychometric framework, we use ratings of psychological health collected from 1,232 teachers, and show how this revised framework provides a clearer picture of teachers’ profiles of psychological health. 相似文献
56.
论可持续发展观的和谐三维度 总被引：1，自引：0，他引：1
正视"三大危机":生态危机、人态危机和心态危机,解决的出路在于建立可持续发展的"和谐三维度":人与自然和谐是可持续发展的基础维度,人与社会和谐是可持续发展的关键维度,人自身和谐是可持续发展的目标维度. 相似文献
57.
师庭雄 《玉溪师范学院学报》2001,17(1):61-63
为阐释思想在中西方语体中的意义为何,笔者推出了一个"限度"与"思想"的问题,并借对这一问题的讨论,诠释着思想在中西经验中不同的现身状态. 相似文献
58.
奇异值分解是提取数据特征信息的一种强大工具,其应用可以从信息检索领域扩展到金融、医疗、统计学等各领域,是简化数据、相似度计算的一种有效方法。对奇异值分解原理和特性进行阐述,介绍了基于Python与其相关科学计算库的奇异值分解过程和相似度算法,解释了将庞大的数据矩阵映射到低维空间的转换过程,图像数据通过奇异值分解较原始图像压缩了近8倍。分别对SVD在推荐系统和图像压缩两方面的具体应用进行描述,总结出奇异值分解在数据降维中的强大应用和良好前景。 相似文献
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借鉴国外服务质量理论和方法,通过实证分析研究影响高校体育教育服务质量的因素,确定衡量高校体育教育服务质量的维度,并进行信度和效度的检验,从而为学生主体评价高校体育教育质量提供理论支持. 相似文献
60.
纵观媒介发展史,媒介的更新必然带来文学的革新。在当下电子媒介日新月异的时代,诸多新媒介的出现必将成为文学发展的契机。作为一种文学活动文学受到电子媒介的影响和渗透,其各个构成维度——世界、文本、作者和读者都发生了改变。世界的丰富化、文本的多元化、创作的多样化、读者的广泛化打开了文学发展的新天地,也为文学理论研究提供了新视域。 相似文献