Resistance partial factor and reliability of cast ball-and-socket support joint     

韩庆华  芦燕  金明昌 《天津大学学报(英文版)》2011,17(6):391-396

Considering the uncertainty of material performance, geometric characteristic and analysis method, the analysis of statistical parameters of the resistance of cast ball-and-socket support joints and the reliability analysis are carried out by JC method (improved first-order second-moment method) based on the relevant experimental data. Results show that the resistance partial factor of the joint increases with the increase of the reliability index. The resistance partial factors are suggested corresponding to the reliability index under different load combinations. Moreover, the suggested resistance partial factor is adopted in reliability design, and it is found that the reliability index of the joint is larger than the target reliability index. The optimal load combination is the one in which live load plays an important control role. Finally, based on the suggested resistance partial factors, the reliability analysis of cast ball-and-socket support joints of a project is conducted.  相似文献   

Peer assessment accounting for student agreement     

Jordan L. Neus 《Assessment & Evaluation in Higher Education》2011,36(3):301-314

Peer assessment has been gaining significant ground as a means of fostering an environment of accountability and responsibility for group projects in higher education. A popular peer assessment method assigns individual grades via a linear relationship to peer assessment scores. Using this method, a group member who receives his or her group’s average peer assessment score is assigned the instructor‐given group grade; the group member who receives a total peer assessment score of zero is assigned an individual grade of zero. Unfortunately, applying this method often requires time‐consuming exploratory data analysis because of the potential for the method to yield a high spread of grades, including grades over 100%. The present study proposes a modification, which accounts for the degree of student agreement. When the modified procedure results in a change from the group grade, the direction of change is always the same, but with smaller magnitude, requiring less subsequent data analysis and instructor time demands. Easy‐to‐modify SAS code for applying the method is presented in the Appendix.  相似文献   

云南企业文化测评体系构建研究——基于文化特质模型的优化及实证     

王小菲  肖冬平  程颂 《蒙自师范高等专科学校学报》2015,(4):62-67

该研究以组织有效性文化特质模型为基础,通过维度假设和模型优化,形成了由28个题项组成的量表。利用SPSS统计软件因子分析中的主成分分析法和最大方差正交旋转法识别出十个维度,并通过Cronbach’sα值检验出这十个维度具有较高的信度。该体系的构建为云南企业文化量化管理提供了依据。  相似文献   

在中国大学生样本中的修订成人依恋量表 AAS     

杜江红  王华昕  李永鑫 《湖州师范学院学报》2015,(1)

对国外成人依恋量表(Adult Attachment Scale,AAS)翻译后分两次对国内799名大学生施测,删除不合适的项目后检验其信效度,结果表明：修订的 AAS 分为依恋回避和依恋焦虑两个维度,依恋回避维度包括7个项目、依恋焦虑维度包括6个项目;探索性因素分析显示项目因子载荷在0.42~0.75之间,两个因素共可解释总体变异的45.23%;验证性因素分析的各项拟合指数均较为理想;依恋回避和依恋焦虑两个维度的会聚效度、区分效度、效标效度、α系数、组合信度均达到了心理测量学的要求。修订的 AAS 能真实和稳定地测量大学生的成人依恋,可以作为评估工具在以后的研究中加以运用。  相似文献   

需求不确定情况下沿海燃料油供应鲁棒优化     

刘炬  钟铭  黄梦思  陈江涛  张宇涵 《上海海事大学学报》2019,40(4):33-39

针对沿海地区燃料油供应问题,制定燃料油配送方案,设计配送航线和配送量使运输成本和库存成本最小,同时考虑需求不确定的情况,使需求发生一定变动时原方案依旧可行。与不考虑需求不确定的供应方案相比,使用鲁棒优化方法得到的结果可靠性更强,发生缺货的可能更小。由于需求不确定情况下存在的二次约束严重影响模型的求解效率,提出一种两阶段求解方法来分解问题,使求解效率得到明显提高。对于存在需求不确定情况的供应系统,决策者使用该鲁棒优化模型时,可以根据风险偏好并通过调整参数最大限度地提高供应方案的可靠性。  相似文献   

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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锻炼社会支持量表的编制与信效度检验          下载免费PDF全文

钟涛  胡亮  刘献国 《体育科研》2019,(6):42-17

有规律的体育锻炼对人们的身心健康具有积极的促进作用，而社会支持是影响锻炼行为的重要相关因素。因此本研究的目的在于编制和检验锻炼社会支持量表。通过结合现有研究文献和质性研究，确立了初测量表，并通过两轮定量研究，应用探索性和验证性因子分析，信度分析以及校标效度检验对该量表进行了标准化的信效度检验。结果表明锻炼社会支持量表由4个因子构成，即情感性支持、信息性支持、工具性支持、同伴性支持，共24个条目。统计分析显示，量表具有良好的结构效度、内部一致性、重测信度和校标效度。锻炼社会支持量表符合我国文化背景，可以作为在中国人群中进行锻炼社会支持测量的工具。  相似文献   

Validity and Reliability of Three Self-Report Instruments for Assessing Attainment of Physical Activity Guidelines in University Students     

Joseph J. Murphy  Marie H. Murphy  Ciaran MacDonncha  Niamh Murphy  Alan M. Nevill  Catherine B. Woods 《Measurement in physical education and exercise science》2017,21(3):134-141

The purpose of this study was to compare the validity and reliability of three short physical activity self-report instruments to determine their potential for use with university student populations. The participants (N = 155; 44.5% male; 22.9 ± 5.13 years) wore an accelerometer for 9 consecutive days and completed a single-item measure, the a brief two item measure and the International Physical Activity Questionnaire—Short Form questionnaires on day 1 and 9. Correlations between self-reported and accelerometer derived moderate-to-vigorous physical activity levels were moderate for the International Physical Activity Questionnaire—Short Form, while poor for the single-item measure and the a brief two item measure. The agreement level was high with the International Physical Activity Questionnaire—Short Form (77.4%) and moderate for both the single-item measure (45.2 %) and a brief two item measure (44.5 %). The intraclass correlations between the two administrations were moderate to strong across all measures (0.52–0.70) in 133 participants. The International Physical Activity Questionnaire—Short Form is the most suitable of these three self-report instruments for use with this population due to higher correlations and levels of agreement with accelerometry.  相似文献   

Psychometric Properties of a Parental Questionnaire for Assessing Correlates of Toddlers’ Physical Activity and Sedentary Behavior     

Valerie Carson  Kylie D. Hesketh  Ryan E. Rhodes  Christina Rinaldi  Wendy Rodgers  John C. Spence 《Measurement in physical education and exercise science》2017,21(4):190-200

This study examined the psychometric properties of a questionnaire developed with the guidance of the socialization model of child behaviour to understand modifiable correlates of toddlers’ physical activity and sedentary behaviour. Findings are based on 118 parents (33.7 ± 4.9 years; 86% female) of toddlers (19.3 ± 2.7 months; 48% female) from Edmonton, Canada in The Parents’ Role in Establishing healthy Physical activity and Sedentary behaviour habits study (PREPS). The PREPS questionnaire encompassed 21 variables across the constructs of the socialization model of child behaviour. Of the nine variables assessed for internal consistency reliability, eight had good (α ≥ 0.70) reliability. Of the 15 continuous variables assessed for 1-week test–retest reliability, 10 had moderate (intra-class correlation = 0.50–0.74) and 5 had good (intra-class correlation ≥ 0.75) reliability. Of the six categorical variables assessed for 1-week test–retest reliability, two had fair (К = 0.21–0.40), one had moderate (К = 0.41–0.60), one had substantial (К = 0.61–0.80), and two had almost perfect (К = 0.81–1.00) reliability. Of the 12 sedentary behaviour variables assessed for convergent validity, 7 were significantly correlated with children’s screen time, of which three were small (r ≤ 0.29), two were medium (r = 0.30–0.49), and two were large (r ≥ 0.50) effect sizes.  相似文献   

Digital Module 07: Subscores: Evaluation and Reporting https://ncme.elevate.commpartners.com     

Sandip Sinharay 《Educational Measurement》2019,38(3):114-115

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