Modeling Partial Knowledge on Multiple‐Choice Items Using Elimination Testing

Single‐best answers to multiple‐choice items are commonly dichotomized into correct and incorrect responses, and modeled using either a dichotomous item response theory (IRT) model or a polytomous one if differences among all response options are to be retained. The current study presents an alternative IRT‐based modeling approach to multiple‐choice items administered with the procedure of elimination testing, which asks test‐takers to eliminate all the response options they consider to be incorrect. The partial credit model is derived for the obtained responses. By extracting more information pertaining to test‐takers’ partial knowledge on the items, the proposed approach has the advantage of providing more accurate estimation of the latent ability. In addition, it may shed some light on the possible answering processes of test‐takers on the items. As an illustration, the proposed approach is applied to a classroom examination of an undergraduate course in engineering science.     

论片面共同正犯

片面共同正犯是否成立,历来有肯定说和否定说之争.二者分别站在行为共同说和犯罪共同说的理论之上,来阐明各自的观点,均有一定的合理性,但也存在一定的片面性.本文从主客观相统一的原则、共同犯罪的刑法理论及现状等三个方面论述了片面共同正犯存在的合理性.     

某几类数值积分的计算

采用递归迭代法解决了某几种数值积分的计算问题，该方法比采用传统的复化的梯形公式、复化的辛浦生公式来得快，更精确，容易达到要求的精度。     

我国股票指数收益的正态性分析

金融市场的风险管理、回报率的预测以及绩效的评估通常要涉及到变量的分布问题,因为正态分布拥有特殊的数字特征,一般假设金融资产时间序列数据服从于正态分布。但是国外大多数的研究表明正态分布不符合实际的情况。本文根据我国上海股票交易所的综合指数和深圳交易所的成分指数的数据,使用三种不同的检验方法,在不同的交收制度下分别对它们的日收益率、周收益率和月收益率做正态性检验。结果表明,两种指数的日收益率和周收益率不服从正态分布,而月收益率在一定的阶段表现出正态特性。     

发散的P-级数部分和的一个估计

在文献[1]的基础上讨论了发散的P-级数部分和一个估计。得到:当     

An Exploratory Analysis of a Subjective Well-Being Model for Chinese University Students

College students experience great stress due to many factors, such as an uncertain future, academic responsibilities, and pressures imposed by social communication. Many institutions of higher education are focusing on how to mediate stressful situations and increase the subjective well-being (SWB) of students to sustain a lifestyle focused on wellness. The online survey used for this study focused on testing an exploratory SWB model by implementing partial least squares structural equation modeling (PLS-SEM) techniques. The participants were 470 college-aged students enrolled in seven different institutions in six cities across China. Findings yielded a good model fit (the Standardized Root Mean Squared Residual [SRMR] = .054) with the validity of manifest variables, reliability of the latent variables (LVs), and overall SWB model indicating moderate predictiveness (GoF R2 = .476) by the LVs. Additionally, all of the direct path coefficients and indirect path coefficients that consisted of four partial mediators and one full mediator yielded statistically significant results via bootstrapping. Furthermore, path coefficients for utilization of emotion to life satisfaction for the cognitive exercise group were significantly higher than for the non-cognitive exercise group. The findings illustrated a good model fit for an exploratory SWB model that can predict an individual’s SWB, and cognitive and non-cognitive exercises had different effects on the individuals’ SWB.     

现代汉语词缀问题初探

现代汉语的词缀系统一向被认为是封闭的、缺乏活力的,近20年来这个系统却发生了显著的变化。一批传统词缀重新活跃起来,而且更加引人注目的是一批新词缀形成,并参与构词,为汉语的词缀系统带来了生机。就目前状况看,汉语的词缀数目增多,构词能力增强,许多新造派生词进入交际,从而导致了汉语派生词构词手段的发展。     

大系统的部分联结一致渐近稳定性及指数稳定性

基于子系统间某些关联可能是固定的情况,本文讨论了大系统的部分联结稳定性,并且利用向量李雅普诺夫函数法研究了大系统的部分联结一致渐近稳定性及指数稳定性,推广了大系统关联稳定性的相关结论。     

一类偶数阶偏微分方程的振动判据

用微分不等式方法讨论了一类偶数阶中立型偏微分方程的振动性 ,得到了该类偏微分方程振动的判据     

烷氧取代聚对苯乙炔衍生物的合成

以对甲氧式苯酚和溴代烷为原料,经醚化,双氯甲基化和脱氯化氢反应,成功地合面出一系列高产率的氯仿可溶性烷氧取代聚对苯乙炔衍生物,讨论了各步合成反应的影响因素及其改进措施,并对聚合物的光,热性能进行了测试,产品的结构由ＩＲ和＾１ＨＮＭＲ得到确认。