Comparing cumulative index and factor analytic approaches to measuring maltreatment in the National Longitudinal Study of Adolescent to Adult Health     

《Child abuse & neglect》2019

Child maltreatment is a complex and multifaceted construct in need of advanced statistical techniques to improve its measurement. The current study compared the predictive utility of a cumulative index to a factor analytic approach for constructing a measure of maltreatment. Data were from Waves III and IV of the National Longitudinal Study of Adolescent to Adult Health (Wave III: n = 14,800; Wave IV: n = 12,288). As adults, participants retrospectively reported on their childhood experiences of physical abuse, sexual abuse, emotional abuse, physical neglect, supervisory neglect, and social services investigations. Both the cumulative index and a two-factor solution showed evidence of convergent validity, predicting lifetime incidence of homelessness, being paid for sex, and various measures of running away or living apart from biological parents, and prospectively predicting depression, substance use, and criminal behavior. The latent variables, derived from a factor analytic approach, had greater explanatory power for many outcomes compared to the cumulative index, even when controlling for sociodemographic variables. Results suggest that factor analysis is a better methodology than a cumulative index for measuring maltreatment in large datasets when explanatory power for external outcomes is of greatest concern.  相似文献   

高水平射击运动员心理选材指标的研究   总被引：9，自引：1，他引：8  

陈昱 《首都体育学院学报》2003,15(3):95-97

本文通过与射击运动紧密相关的五项心理指标：简单反应时、肩臂动作稳定性、手指本体感、智力、个性等的分析讨论，拟从高水平健将级运动员身上明确其成功潜在的心理因素，服务于运动员的科学选材。  相似文献   

过度运动对大鼠海马脑源性神经营养因子的影响   总被引：3，自引：0，他引：3  

高颀  满君  田野 《北京体育大学学报》2004,27(9):1211-1212

观察过度运动对海马神经元脑源性神经营养因子(BDNF)的影响,探讨过度运动导致的海马神经元形态改变与BDNF的关系.大鼠6周递增负荷游泳运动后取海马制作石蜡切片,采用SABC免疫组织化学染色方法观察BDNF的变化.结果发现:过度运动后大鼠海马发生形态变化,发生结构变化的神经元的BDNF表达增加.  相似文献   

论终身教育思想对体育课程改革的影响   总被引：13，自引：0，他引：13  

陈俊钦 《福建体育科技》2003,22(1):39-41

为了适应现代社会的快速发展 ,人类改变了将人生划分为学习和工作两个阶段的观念 ,产生了终身教育的思想。终身教育思想又对教育的组成部分———体育产生影响 ,促使了终身体育思想的产生。终身体育思想对体育课程改革起到十分重要的影响作用 ,主要表现在对体育课程目标、体育教学内容、体育教学模式和体育教学评价等方面改革的影响 ,使改革充分体现了体育课程为终身体育打基础的思想  相似文献   

影响竞技健美操最后得分因素探究——以第10届世界健美操锦标赛六人操决赛为例     

周雯  杜少武 《福建体育科技》2009,28(6):20-23

运用图像分析、文献资料调研、数理统计等研究方法，对第10届世界健美操集体六人决赛前8名运动员名次与难度、艺术、完成得分进行了系统分析。研究显示，提高难度动作的质量才是关键所在，难度、艺术和完成是相辅助相成、相互影响的，仅仅孤立地追求某一方面的得分，只会得不偿失。  相似文献   

SciELO对发展中国家开放存取期刊建设的启示   总被引：9，自引：0，他引：9  

刘海霞  胡德华  陶雯  曲艳吉 《图书馆建设》2006,(5):58-59,62

本文对科技在线电子图书馆（SciELO）的开放存取期刊进行了深入、具体的调查与分析，包括对学科分布、影响因子、即时因子和半衰期进行质量评价研究，以对发展中国家开放存取期刊建设有所启示。  相似文献   

网络链接分析研究进展   总被引：8，自引：1，他引：8  

张洋  邱均平  文庭孝 《图书情报知识》2004,(6):3-8

本文对网络链接分析研究的进展情况作了较为全面、详细的介绍，并分析了目前网络链接分析研究中存在的问题。  相似文献   

Impact Factors and the Central Limit Theorem: Why citation averages are scale dependent     

Manolis Antonoyiannakis 《Journal of Informetrics》2018,12(4):1072-1088

Citation averages, and Impact Factors (IFs) in particular, are sensitive to sample size. Here, we apply the Central Limit Theorem to IFs to understand their scale-dependent behavior. For a journal of n randomly selected papers from a population of all papers, we expect from the Theorem that its IF fluctuates around the population average μ, and spans a range of values proportional to $\sigma /\sqrt{n}$, where σ² is the variance of the population's citation distribution. The $1/\sqrt{n}$ dependence has profound implications for IF rankings: The larger a journal, the narrower the range around μ where its IF lies. IF rankings therefore allocate an unfair advantage to smaller journals in the high IF ranks, and to larger journals in the low IF ranks. As a result, we expect a scale-dependent stratification of journals in IF rankings, whereby small journals occupy the top, middle, and bottom ranks; mid-sized journals occupy the middle ranks; and very large journals have IFs that asymptotically approach μ. We obtain qualitative and quantitative confirmation of these predictions by analyzing (i) the complete set of 166,498 IF & journal-size data pairs in the 1997–2016 Journal Citation Reports of Clarivate Analytics, (ii) the top-cited portion of 276,000 physics papers published in 2014–2015, and (iii) the citation distributions of an arbitrarily sampled list of physics journals. We conclude that the Central Limit Theorem is a good predictor of the IF range of actual journals, while sustained deviations from its predictions are a mark of true, non-random, citation impact. IF rankings are thus misleading unless one compares like-sized journals or adjusts for these effects. We propose the Φ index, a rescaled IF that accounts for size effects, and which can be readily generalized to account also for different citation practices across research fields. Our methodology applies to other citation averages that are used to compare research fields, university departments or countries in various types of rankings.  相似文献   

太原市城中村体育公共服务均等化的实证研究     

贾雅婕  韩雨梅 《吉林体育学院学报》2016,(1):50-56

调查城镇化建设中太原市城中村体育公共服务的发展现状，全面反映太原市城中村公共体育均等化发展的概况，揭示太原市城中村公共服务的发展规律及其制约因素，为太原市积极推进体育公共服务均等化提供理论基础和决策参考。本研究从太原市6个区域内的173个城中村中分层选取6个城中村做为研究对象进行研究。通过问卷调查，因子分析等数理统计法方法，找出影响太原市城中村体育公共服务均等化的因子：外在因子、内在因子、基本因子、性别与资源共享因子和意识形态因子五种因子。应重视太原市城中村体育基础设施建设，满足体育健身需求之间的矛盾，调动居民参与体育健身娱乐的积极性，扩大金费来源，促进太原市城中村的体育事业的发展。  相似文献   

The influence of shoe drop on the kinematics and kinetics of children tennis players     

Alexis Herbaut  Pascale Chavet  Maxime Roux  Nils Guéguen  Christophe Gillet  Franck Barbier 《European Journal of Sport Science》2016,16(8):1121-1129

This study investigated the immediate effects of reducing the shoe drop (i.e. the difference between the heel and the forefoot height) on the kinematics and kinetics of the lower extremities of children tennis players performing a tennis-specific movement. Thirteen children tennis players performed a series of simulated open stance forehands wearing 3 pairs of shoes differing only in the drop: 0 (D0), 6 (D6) and the control condition of 12?mm (D12). Two embedded forceplates and a motion capture system were used to analyse the ground reaction forces and ankle and knee joint angles and moments of the leading lower limb. In D6 compared with D12, the peak impact force was reduced by 24% (p?=?.004) and the ankle was less dorsiflexed at foot strike (p?=?.037). In D0 compared with D12, the peak impact force was reduced by 17% (p?=?.049), the ankle was less dorsiflexed at foot strike (p?=?.045) and the knee was more flexed at foot strike (p?=?.007). In addition, 4 out of 13 participants (31%) presented a forefoot strike pattern for some of the trials in D0. No difference was observed across shoe conditions for the peak knee extensor moment (p?=?.658) or the peak ankle plantarflexor moment (p?=?.071). The results provide preliminary data supporting the hypothesis that for children tennis players, using a 6-mm lower shoe drop might reduce heel impact forces and thus limit potentially impact-related injuries.  相似文献