Inference of non-centrality parameter of a truncated non-central chi-squared distribution

Non-central chi-squared distribution plays a vital role in statistical testing procedures. Estimation of the non-centrality parameter provides valuable information for the power calculation of the associated test. We are interested in the statistical inference property of the non-centrality parameter estimate based on one observation (usually a summary statistic) from a truncated chi-squared distribution. This work is motivated by the application of the flexible two-stage design in case–control studies, where the sample size needed for the second stage of a two-stage study can be determined adaptively by the results of the first stage. We first study the moment estimate for the truncated distribution and prove its existence, uniqueness, and inadmissibility and convergence properties. We then define a new class of estimates that includes the moment estimate as a special case. Among this class of estimates, we recommend to use one member that outperforms the moment estimate in a wide range of scenarios. We also present two methods for constructing confidence intervals. Simulation studies are conducted to evaluate the performance of the proposed point and interval estimates.     

职校内生产性实训基地建设的实践与思考

结合江苏省连云港中等专业学校机电专业校内生产性实训基地建设的具体案例,从中职学校校内实训基地建设现状入手,理论融合实践进行分析,对以教育功能为主体、校办企业为基础的主导式校内生产性实训基地的建设开展实践性研究,并从管理体系、运行体系、评价体系三个方面进行了阐述。     

近五年陕西省中小学教师培训多元化需求分析调查及解决策略研究

通过对自2009年以来近五年我国中小学教师专业培训需求研究成果进行分析和整理,分别从培训需求政策、培训动机需求、课程需求、模式需求等方面进行分析,最后提出解决培训中出现的问题和策略,旨在为教育行政部门提供可借鉴的参考。     

精致化纸浆模塑制品及关键制备工艺参数优化

为制备精致化纸浆模塑制品并研究关键加工工艺参数对其平滑度、光泽度的影响,以牛皮纸二次纤维为原料,在 全自动纸浆模塑机组上进行实际生产操作试验,用sPss软件进行极差分析和重复方差分析,对关键加工工艺参数进行 分析优化,得出较优的工艺参数为：打浆度25。SR、施胶剂用量1.5%、热压整型温度110℃和压力5 MPa。各参数影响 的主次顺序为：热压压力>打浆度>施胶剂用量>热压温度。研究表明提高热压压力,增加施胶剂用量,调节打浆度和 热压温度均可提高纸浆模塑制品的平滑度和光泽度     

论司法公开的必要限度--以副卷制度为着眼点分析

我国提出“司法公开”的口号已有很多年了,国内外关于司法公开问题的研究也比比皆是,已经达到了相对成熟的程度。然而,就关于法院案卷的副卷公开问题,研究者却是少之又少。副卷制度的存在,在给司法活动提供便利的同时,也引发了诸多问题。诱发了法院通过上下级领导请示“暗箱”操纵审判结果,或其它机关不当干预司法等现象,破坏司法公正和权威。而副卷制度的存在,形成了巨大“保护伞”,并将这些行为彻底地掩盖起来。因此,副卷制度所衍生出的问题亟需人们深刻反思。随着我国“司法公开”的不断推进,及时发现副卷制度的弊病,并对其进行合理的改造,有助于确保司法真正地在阳光下运行,提升司法运行的社会效果。     

“顽疾”还是“误诊”？产业扶贫“内生动力不足”问题探究

产业扶贫中“内生动力不足”是阻碍脱贫攻坚获胜的难题。以豫北黄河滩区Q乡为例,对扶贫项目运营情况进行长期调研,深度剖析“内生动力不足”产生的根源。调研发现,产业扶贫项目的自然风险、市场风险、道德风险与政治风险是影响贫困户“内生动力不足”的重要因素,认知评估理论与资源保存理论能有效揭示项目风险影响贫困户“内生动力不足”问题的内在作用机理。贫困户会对项目风险进行全面评估,认为凭借自身资源无力应对,同时为避免自有资源遭受损失,进而对扶贫项目表现消极,产生“内生动力不足”问题。为此,从健全防御配套设施、避免官僚逻辑、弱化精英偏好、人才培养与引进等方面化解项目风险,是提升贫困户“内生动力”、促进产业扶贫项目可持续发展的有效措施。     

Cultural capital or relative risk aversion? Two mechanisms for educational inequality compared1

In this paper we empirically examined two explanatory mechanisms for educational inequality: cultural reproduction and relative risk aversion, using survey data taken from secondary school pupils in Amsterdam. Cultural reproduction theory seeks to explain class variations in schooling by cultural differences between social classes. Relative risk aversion theory argues that educational inequalities can be understood by between-class variation in the necessity of pursuing education at branching points in order to avoid downward mobility. We showed that class variations in early demonstrated ability are for a substantial part cultural: cultural capital - measured by parental involvement in highbrow culture - affected school performance at the primary and secondary level. However, relative risk aversion - operationalized by being concerned with downward mobility - strongly affects schooling ambitions, whereas cultural capital had no effect. Thus, we conclude that 'primary effects' of social origin on schooling outcomes are manifested through cultural capital and not through relative risk aversion (in addition to other potential sources of class variations such as genetics). Relative risk aversion, and not cultural capital, affects schooling ambitions, which is relevant for our understanding of secondary effects.