试卷质量和考试成绩评判指标的分析研究

本文对试题警告系数、考试成绩的信度、考试成绩的效度及学生警告系数的计算式做了修正 ,使之能适合计算机处理。提出试卷平均得分、试卷区分度、试卷警告系数和学生试卷得分度评判指标 ,使试卷质量 ,教学质量和学生学习水平的评判量化 ,可用于教学评估     

Parameter Estimation Accuracy of the Effort-Moderated Item Response Theory Model Under Multiple Assumption Violations

As low-stakes testing contexts increase, low test-taking effort may serve as a serious validity threat. One common solution to this problem is to identify noneffortful responses and treat them as missing during parameter estimation via the effort-moderated item response theory (EM-IRT) model. Although this model has been shown to outperform traditional IRT models (e.g., two-parameter logistic [2PL]) in parameter estimation under simulated conditions, prior research has failed to examine its performance under violations to the model’s assumptions. Therefore, the objective of this simulation study was to examine item and mean ability parameter recovery when violating the assumptions that noneffortful responding occurs randomly (Assumption 1) and is unrelated to the underlying ability of examinees (Assumption 2). Results demonstrated that, across conditions, the EM-IRT model provided robust item parameter estimates to violations of Assumption 1. However, bias values greater than 0.20 SDs were observed for the EM-IRT model when violating Assumption 2; nonetheless, these values were still lower than the 2PL model. In terms of mean ability estimates, model results indicated equal performance between the EM-IRT and 2PL models across conditions. Across both models, mean ability estimates were found to be biased by more than 0.25 SDs when violating Assumption 2. However, our accompanying empirical study suggested that this biasing occurred under extreme conditions that may not be present in some operational settings. Overall, these results suggest that the EM-IRT model provides superior item and equal mean ability parameter estimates in the presence of model violations under realistic conditions when compared with the 2PL model.     

公共文化服务的基本特征与现代政府的文化责任

公共文化服务的基本特征，决定了公共文化服务绝不是任何私人组织的盈利活动，而是一项关乎全民共同利益的公共事业。这样的公共事业不可能由任何私人组织来提供，必须由国家政府来举办。当前，在全面实现小康社会的伟大进程中，构建公共文化服务体系，国家政府具有义不容辞和不可推卸的重要责任。     

基于Bootstrap法的核估计逼近

从分布密度函数为f的总体中抽取独立同分布的样本X1,…,Xn,μ=EX1研究密度泛函θ=f(μ)的核型估计fn()的Bootstrap逼近问题.     

基于贝叶斯估计的Context量化器设计方法

介绍了一种基于贝叶斯估计的Context量化器设计方法.通过将自适应码长增量与贝叶斯估计中的先验概率估计进行结合,使得该量化器在不需要先验知识的情况下,既考虑到Context量化本身的特点,又使得编码后信源的自适应码长最短,最终保证了Context量化的自适应性.实验结果表明,该Context量化器设计方法能获得最优量化结果,达到设计目标.     

Likelihood-Based Confidence Intervals in Exploratory Factor Analysis

In exploratory or unrestricted factor analysis, all factor loadings are free to be estimated. In oblique solutions, the correlations between common factors are free to be estimated as well. The purpose of this article is to show how likelihood-based confidence intervals can be obtained for rotated factor loadings and factor correlations, by applying maximum likelihood factor analysis subject to scaling and rotation constraints. As an illustrative example, an oblique 5-factor model will be fitted to the variance-covariance matrix of the 30 personality facets measured by the Revised NEO Personality Inventory, and confidence intervals will be estimated for all factor loadings and factor correlations, as well as for the associated reliability and validity coefficients.     

关于单一简单问题的学生团体反应时间分布参数估计与运用

介绍在计算机局域网环境条件下进行单一简单问题测试,收集学生团体的反应时间分布数据并加以处理的基本方法,给出时间反应分布参数的矩估计结果,初步探讨学生团体反应信息的有效运用问题。     

遥感技术在农业生产中的应用研究

遥感技术既是一种准确的对地观测技术。又是一种有效的信息获取手段。农业是遥感应用中最成功的领域之一。遥感技术和计算机技术结合应用。已经使农业研究从经验水平提高到理论水平,使农业生产进入到定量化、精准化和机理化的新阶段。     

基于MATLAB的赫尔默特方差分量估计法实现

本文通过对赫尔默特方差分量估计法的理论、模型和算法的研究,应用MATLAB平台,使用MATLAB语言编写程序,开发出通用的模块,制作可视化界面,操作简单,减少了测绘工作的内业工作量,提高了工作效率,并可作为其他平差问题编程的参考,此模块具有极高的实际意义和应用价值。     

非齐次等式约束线性回归模型回归系数的综合条件岭估计

提出非齐次等式约束线性回归模型回归系数的一个新的有偏估计,即综合条件岭估计,讨论了综合条件岭估计的性质,在一定的条件下,综合条件岭估计的样本总方差、均方误差、均方误差矩阵均分别小于约束最小二乘估计的相应误差.在综合条件岭估计下,条件岭估计和条件根方估计为其特例,从而统一了条件岭估计和条件根方估计的理论.