Digital Module 09: Sociocognitive Assessment for Diverse Populations https://ncme.elevate.commpartners.com     

Robert J. Mislevy  Maria Elena Oliveri 《Educational Measurement》2019,38(4):110-111

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一种改进的基于峭度指标的FastICA算法     

孟令博  耿修瑞  杨炜暾 《中国科学院大学学报》2019,36(3):410-416

基于峭度指标的FastICA算法具有较快的收敛速度和较高的计算效率，被广泛应用于多光谱图像的特征提取。经典的FastICA算法基于固定点迭代法得到图像的各个独立成分，在迭代过程中，每一个独立成分的求解都需要所有像元的参与。因此，当数据量较大或图像中像元较多时，FastICA的计算量很大，此时它的速度优势就会大打折扣。遥感数据一般都具有较大的尺寸，因此如何将FastICA直接应用于遥感数据，是一个具有实际意义的问题。通过引入多光谱图像协峭度张量的概念，将FastICA的固定点迭代问题转化为代数形式的张量计算，避免每次迭代过程中需所有像元参与的缺陷，因而大大降低计算复杂度。多光谱图像实验结果表明，该算法明显快于传统的基于峭度指标的FastICA算法。  相似文献   

Considerations for the use of functional principal components analysis in sports biomechanics: examples from on-water rowing     

John Warmenhoven  Stephen Cobley  Conny Draper  Andrew Harrison  Norma Bargary  Richard Smith 《Sports biomechanics / International Society of Biomechanics in Sports》2019,18(3):317-341

The proliferation of new biomechanical technology in laboratory and field settings facilitates the capture of data-sets consisting of complex time-series. An understanding of the appropriate statistical approaches for analysing and interpreting these data-sets is required and the functional data analysis (FDA) family of statistical techniques has emerged in the biomechanical literature. Given the use of FDA is currently in its infancy with biomechanical data, this paper will form the first of a two part series aiming to address practical issues surrounding the application of FDA techniques in biomechanics. This work focuses on functional principal components analysis (fPCA), which is explored using existing literature and sample data from an on-water rowing database. In particular methodological considerations for the implementation of fPCA such as temporal normalisation of data, removal of unwanted forms of variation in a data-set and documented methods for preserving the original temporal properties within a set of curves are explored in detail as a part of this review. Limitations and strengths of the technique are outlined and recommendations are provided to encourage the appropriate use of fPCA within the field of applied sports biomechanics.  相似文献   

研究数据使用统计新标准及其应用案例研究     

林伟明  叶兰 《图书情报工作》2019,63(16):32-42

[目的/意义]介绍Make Data Count与COUNTER联合推出的《研究数据使用统计实施规范》，为数据级别计量提供新指标与新视角。[方法/过程]通过对标准文本的分析，介绍该规范的提出背景、目标、范围、相关概念及核心内容，通过案例剖析Dash、DataONE、Zenodo及其他7个数据存储库对《规范》的应用情况。[结果/结论]研究数据的使用统计具有其独特之处，《规范》的推出可对数据引用及数据替代计量形成补充进而描述完整的科研学术影响力。目前遵循该规范的数据存储库还不多，为推动数据使用计量的应用，需要标准组织、科研人员、机构库及数据存储库、出版商、科研机构及资助机构、图书馆等不同利益相关者在数据产生、管理、传播与利用等环节的相互合作。  相似文献   

Usage Comparison between an English-Language and a French-Language E-Monograph Collection in a Bilingual Canadian University     

Alain R. Lamothe 《International Information and Library Review》2020,52(2):139-160

Abstract

This article reports the results of a quantitative and systematic analysis comparing usage rates between English-language and French-language e-monograph titles at Laurentian University, Canada. Full-text viewings were collected as usage metrics. English-language e-monographs exhibited medium strength linear relationships between collection size and usage. On the other hand, French-language e-monographs exhibited weak linear relationships between collection size and usage. The French-language e-monograph collection experienced a higher rate of full-text use, relative to size. The cost-per-viewing ratio for the English-language e-monograph collection was higher than those that calculated for the French-language collection.  相似文献   

Mobiles and Cancer: A Case of Phony Connections?     

Eric D Nordmoe 《Teaching Statistics》2007,29(1):2-7

Students learning statistics want to know how our methods are used in the real world. In response, this article offers a discussion of a relevant and timely medical study reported in recent headlines. Careful consideration of the study raises some ideas to get students engaged with statistics.  相似文献   

Teaching first‐year statistics students with COVID‐19 real‐world data: Graphs     

Danri H. Delport 《Teaching Statistics》2021,43(1):36-43

It is said that a picture is worth a thousand words, but what about graphs? Although graphs have the potential to bring data to life, numerous studies show that learners struggle with graphical comprehension. Furthermore, many textbook examples on graphs are boring and appear meaningless to students. Students want to know more about something which is interesting, meaningful, and worth knowing, in other words, something relevant. With the outbreak of the novel coronavirus in December 2019, COVID‐19 is dominating the news worldwide, and the internet is flooded with visual presentations about the virus. To make statistics more fascinating and exciting, relevant and real‐world data such as these can be used in the classroom to stimulate the learning of important statistical concepts such as graphs. Curcio's three levels of graphical comprehension were used as a framework in this study, while the importance of developing a global view on distributions was also emphasized.  相似文献   

Meta‐analysis and mega‐analysis: A simple introduction     

Joseph G. Eisenhauer 《Teaching Statistics》2021,43(1):21-27

Statistical methods are increasingly being used to integrate findings from the ever‐expanding universe of empirical research. Meta‐analysis encompasses various techniques for synthesizing summary statistics, and mega‐analysis pools raw data across studies. This paper offers an introduction to meta‐analysis and mega‐analysis that complements the study of analysis of variance (ANOVA). After a brief conceptual discussion, we provide simple numerical examples.  相似文献   

基于词频分析的我国2004年科学学发展动向研究   总被引：7，自引：0，他引：7       下载免费PDF全文

纪蔚蔚 《科研管理》2006,27(3):81-89

本文运用词频统计的内容分析法,分析我国2004年科学学研究的发展动向。分析结果表明:技术、企业、创新、发展、人、管理、评价、产业等领域是我国2004年科学学的主要研究热点。  相似文献   

科学群落的梯度结构及其生产函数     

林啸宇 《科学学研究》2003,21(1):17-22

本文将“科学群落”定义为科学子系统之一 ,并从角色期望、人格积淀、结构化机制和社会性差异等方面与“科学共同体”、“科学学派”及“科学组织”进行了比较 ,进而讨论了基于生态场类比的群落梯度结构属性 ,并基于发文数的洛特卡统计提出了梯度产出数学模型。  相似文献