The classification accuracy of four problem gambling assessment instruments in population research

Improved methodology was used to re-examine the weak correspondence between problem and pathological gamblers identified in population surveys and subsequent classification of these individuals in clinical interviews. The SOGS-R, the CPGI, the NODS and the Problem and Pathological Gambling Measure (PPGM), as well as questions about gambling participation and expenditures, were administered to a total of 7272 adults. Two clinicians then assessed each person's status, based on comprehensive written profiles derived from these questionnaire responses. Instrument classification was then compared to clinical classification. All four instruments correctly classified most non-problem gamblers (i.e. had good to excellent sensitivity, specificity and negative predictive power). However, the PPGM was the only instrument with good classification of problem gamblers (i.e. excellent sensitivity and positive predictive power). The CPGI and SOGS-R had weak positive predictive power and the NODS had only adequate sensitivity and positive predictive power. Improvement in the classification accuracy of the CPGI occurred when a 5+ cut-off was used and when a 4+ cut-off was used with the SOGS. In general, the classification accuracy of the NODS, SOGS and CPGI is better than prior research suggested but overall accuracy is still modest. With adjusted cut-offs, all three instruments are reasonably congruent with clinical ratings.     

Recent and classical goodness-of-fit tests for the Poisson distribution

We give a critical synopsis of classical and recent tests for Poissonity, our emphasis being on procedures which are consistent against general alternatives. Two classes of weighted Cramér–von Mises type test statistics, based on the empirical probability generating function process, are studied in more detail. Both of them generalize already known test statistics by introducing a weighting parameter, thus providing more flexibility with regard to power against specific alternatives. In both cases, we prove convergence in distribution of the statistics under the null hypothesis in the setting of a triangular array of rowwise independent and identically distributed random variables as well as consistency of the corresponding test against general alternatives. Therefore, a sound theoretical basis is provided for the parametric bootstrap procedure, which is applied to obtain critical values in a large-scale simulation study. Each of the tests considered in this study, when implemented via the parametric bootstrap method, maintains a nominal level of significance very closely, even for small sample sizes. The procedures are applied to four well-known data sets.     

算子的型与指标选择

本文定义了弱*(p,q)型算子,并且通过对强(p,q)型算子指标选择结论的推广,得到了弱(p,q)型算子以及弱*(p,q)型算子指标选择的结论。     

巴什拉的科学仪器思想概述

科学仪器的重要性日益显现,但是科学哲学家大多忽视了对于科学仪器的研究。法国科学哲学家巴什拉对科学仪器展开过具体的论述。巴什拉认为科学仪器是＂物化的理论＂,科学具有物质化的力量,仪器是科学理论物化的产物。巴什拉提出＂现象技术＂的概念,强调实验中仪器与理论的建构作用。巴什拉认为现代科学现象不是＂自然＂给定的,而是通过人类参与自然而建构的,特别通过仪器和理论的解释。巴什拉的科学仪器思想可以作为整合后SSK与科学仪器哲学研究的切入点。     

掺配调节的效应分析及对我国的启示

文章探讨政府采用“掺配调节”时进口商所面临的激励机制，分析在竞争性国内产业和国内垄断生产厂商的情况下这些限制的影响，然后再对“掺配调节”与作为达到各种政策目标的其他政策工具作一比较，在此基础上指出“掺配调节”对我国的借鉴意义。     

城市农民工社会保障问题的思考

城市化是有着丰富涵义的社会变迁过程。城市农民工作为我国城市化进程中的一个特定部分,由于体制、环境以及自身素质等方面因素,使得他们对于城市知觉处于一种普遍的焦虑之中。他们的社会保障由于缺乏应有的制度安排,而成为城市中的弱势族群。关注城市农民工的生存状况,妥善解决农民工的社会保障是解决当前中国农民工问题的关键所在。     

困境中的校园边缘群体——对长沙市高校自考生群体的实证研究

本文从实证的视角,通过在长沙市高校的典型调查,研究一个亟需关注、却易被忽略的特殊大学生群体(高校在读自考生)的生活状况及发展问题,运用翔实的数据、资料,对其发展阻力、成才途径、规律进行深入地阐释。这一探索性实证研究开辟了大学生研究的新领域、新视角。     

Asymptotic Inference on Cointegrating Rank in Partial Systems

The likelihood ratio test for cointegrating rank is analyzed for partial (or conditional) systems in the vector autoregressive error-correction model. Under the assumption of weak exogeneity for the cointegrating parameters, the asymptotic distributions are given and tables of critical values are provided. A discussion is given of some of the assumptions of the model, why they are needed, and how they are tested.     

关于大学物理实验的探讨

本文主要阐述了面对现在的大学生,大学物理实验课在实验内容上应进行的改革;面 对现代化仪器,如何培养学生的动手能力和实验技能。