Consistent estimation in the rasch model based on nonparametric margins

Consider the class of two parameter marginal logistic (Rasch) models, for a test ofm True-False items, where the latent ability is assumed to be bounded. Using results of Karlin and Studen, we show that this class of nonparametric marginal logistic (NML) models is equivalent to the class of marginal logistic models where the latent ability assumes at most (m + 2)/2 values. This equivalence has two implications. First, estimation for the NML model is accomplished by estimating the parameters of a discrete marginal logistic model. Second, consistency for the maximum likelihood estimates of the NML model can be shown (whenm is odd) using the results of Kiefer and Wolfowitz. An example is presented which demonstrates the estimation strategy and contrasts the NML model with a normal marginal logistic model.This research was supported by NIMH traning grant, 2 T32 MH 15758-06 and by ONR contract N00014-84-K-0588. The author would like to thank Diane Lambert, John Rolph, and Stephen Fienberg for their assistance. Also, the comments of the referees helped to substantially improve the final version of this paper.     

Use and interpretation of test scores from limited cognitive test batteries: How g + Gc can equal g

Single scores from limited and unbalanced test batteries of cognitive ability can be ambiguous to interpret theoretically. In this study, a limited verbally and knowledge‐loaded cognitive test battery, from applicants to the Swedish police academies (N = 1,344), was examined to provide foundations for the use and interpretation of test scores. Three measurement models were compared: one single factor model and two bifactor models, which decomposed the variance of the battery into orthogonal components. The models were evaluated by fit indices and omega coefficients, and then applied to the prediction of academic performance. The overall prediction of all models was similar, although specific abilities also were found to provide substantial predictive validity over and above general intelligence (g). The findings provide support for the use of single scores in applied settings (selection), but suggest that it may be more appropriate to interpret such scores as composites of substantive components, and not just as measures of g.     

Training and transfer effects of long-term memory retrieval training

ABSTRACT

Long-term memory retrieval ability and working memory can share attention control ability. Based on cognitive plasticity, a hypothesis that cognitive training could improve long-term memory retrieval efficiency and that this could transfer to retrieval involving working memory was proposed. 60 undergraduates were randomly assigned to a group of training and an active control group; all the participants completed the same tasks in the same order before and after the training, the tasks included a long-term memory retrieval access task, a intelligence test, a switching task, a working memory updating task, a response inhibition task and an interference control task. The statistics results indicate that cognitive training can improve long-term memory retrieval efficiency and has a transfer effect on working memory updating, interference control and switching ability, but not on response inhibition or intelligence. This reveal the plasticity of long-term memory retrieval and its influence on working memory.     

多级评分聚类诊断法的影响因素

从测验和被试两个层面探讨了属性数目、属性层级关系、被试知识状态分布、属性层级误设和Q矩阵误设等因素对GRCDM的影响, 以进一步考察GRCDM的特性。研究发现：(1)GRCDM对属性数目无依赖, 随属性数目的增多判准率反而增高; (2)被试知识状态分布对GRCDM判准率高低无影响; (3)属性层级误设对GRCDM的影响与属性层级类型有关, 当属性层级为无结构型和发散型时, “属性层级关系错乱”的判准率降幅最大; (4)Q矩阵误设对GRCDM的影响因层级关系而异, 收敛型和发散型受影响较小, 无结构型和线型的判准率在属性既冗余又缺失时降幅最大。     

注意能力测评方法的初步研究

本研究自行开发了"BT-LYR注意能力测试软件(1.0版)",并发展了一套融专家经验与实际测试为一体的注意能力模糊综合评价方法.结果显示,注意能力测试软件及模糊综合评价方法都具有较高的信度和效度,值得在实践中进一步检验与推广.     

知情同意的风险决策能力评估探究

能力是知情同意的“守门人”概念,风险相关决策能力将患者的行为能力与具体决策风险结合起来,并充分考量其法律依据与医学特点。一般情况下,临床实践并不需要评估患者的决策能力。但是,当患者拒绝医生提出的最有利患者的建议,患者同意会伤害其本身利益的决策,以及患者前后决策相互矛盾且后期决策会伤害患者健康的情况下,需要评估。风险相关决策能力评估需要考察患者的沟通能力、信息理解能力、评估能力和道德推理能力。其道德合理性在于“行善”的价值辩护,在实践操作中需要借助个体的“实践智慧”。     

住院医师规范化培训中辩证思维能力的培养

精湛的临床思维能力和良好的辩证思维能力是住院医师岗位胜任能力的根本要求。如何切实提升住院医师的辩证思维意识和思维习惯是现阶段住院医师规范化培训中一个亟待解决的现实难题。阐述了培养住院医师辩证思维能力的必要性和重要性,重点分析了住院医师规范化培训中应着力掌握的几种思维素养和能力。在规范化培训阶段,应以提升住院医师的辩证思维素养、强化辩证思维意识和思维习惯的养成教育、注重临床诊治实践能力的培养等为着力点培养住院医师辩证思维能力。     

非小细胞肺癌术后化疗循证医学证据引发的思考

肺癌是目前对人类生命威胁最大的恶性肿瘤之一.对非小细胞肺癌术后化疗的循证医学证据及由此引发的思考:对循证医学的局限性及认识真理的曲折性进行了阐述.