Estimation from smallest values

A two sample cest is proposea ior Liie hypuLiiefexo in.; LUSL observations from a second sample are equivalent, in distribution, to the smallest of r independent realisations of the first sample.

Assuming H to be true the efficiency of parameter estimation for the exponential and normal distributions is then considered     

曲柄群驱动机构单元化平衡

为实现曲柄群驱动机构的模块化设计与生产，定义曲柄单元为该机构的基本单元，以曲柄单元为基础研究曲柄 群驱动机构模块化设计中的摆动力平衡问题。研究了影响平衡块质量及配置位置的因素。分析表明，当在所有曲柄的 反方向配置参数相同的平衡决时，平衡决的质量矩与机构中的曲柄个数，曲柄的质量与长度，运动连杆总质量有关。得 出一种满足模块化设计与生产的方法，该方法能快速有效地实现曲柄群驱动机构单元化平衡     

基层食品监管工作问题及建议

基层是食品监管工作的前沿阵地,是工作的重点和难点。目前市场监管存在如监管依据缺乏、技术支撑水平有限、监管队伍基础薄弱、人员激励机制缺失等一系列亟需解决的问题。提高基层食品安全监管能力是完善食品监管“最后一公里”的关键环节,需完善法律法规及实施细则,强化基层食品检验检测体系建设,提高监管队伍的监管基础,完善激励保障制度,推进智慧监管等。     

Behavior in Multi‐Unit Demand Auctions: Experiments with Uniform Price and Dynamic Vickrey Auctions

We experimentally investigate the sensitivity of bidders demanding multiple units of a homogeneous commodity to the demand reduction incentives inherent in uniform price auctions. There is substantial demand reduction in both sealed bid and ascending price clock auctions with feedback regarding rivals' drop‐out prices. Although both auctions have the same normal form representation, bidding is much closer to equilibrium in the ascending price auctions. We explore the behavioral process underlying these differences along with dynamic Vickrey auctions designed to eliminate the inefficiencies resulting from demand reduction in the uniform price auctions.     

单位制的消解与社区的整合及变迁——以甘肃省G社区为例

以一个单位型社区的变迁为个案,通过观察法和访谈法,从社区文化、社区参与以及制度性作用这3个要素分析单位制度对社区变迁过程和社区内部整合的影响,反映出在我国当代社会转型的背景下,单位社区的消解以及单位社区走向城市社区的必然趋势。单位社区的转型,对我国现代城市社区的建设具有重要的意义,通过描述这一单位社区的变迁,进而引发思考如何有效地应对这一转变,并从单位、居委会和社区自治组织三个方面出发而提出建议。     

单位化的村庄——一个乡村变迁研究的视角

建国以来,中国的一些乡村尤其是那些集体经济强大的村庄发生的变化之一就是对城市单位的模仿,出现了单位化的村庄。改革开放以来,单位化村庄有扩大或加强的趋势。本文以京郊农村“单位化”的过程及其特征为切人点,对城市化过程中出现的村庄单位化现象进行探讨,为研究乡村社会变迁提供了一个视角。村庄的单位化现象是在城市化背景下村落组织发展的一种自我选择,村庄资源独享性是单位化村庄形成的关键因素。这种以农业的方式发展工业,以农村组织形式从事城市管理,在一定历史时期不仅是合理的,也是有效的,但也有其自身的局限性。     

Effectiveness of the Coral Tree Family Service family inpatient unit: a longitudinal study exploring change in family functioning

Child mental health disorders represent a major burden to public health in Australia due to high prevalence rates, the widespread impact across domains, and the potential for difficulties to persist into adolescence and adulthood. Extensive evidence exists for the use of parent management training and cognitive behavioural therapy to treat difficulties experienced by children; however, a proportion of children do not benefit as expected from these treatments. The use of complementary therapeutic approaches and variations to the mode and intensity of existing intervention is warranted; family inpatient units represent a unique example of this. The aim of this study is to evaluate the effectiveness of a well-established Australian inpatient unit that admits the whole family, for children aged 12 years and younger referred with mental health, behavioural, or emotional difficulties. This study's longitudinal within-subject study design utilised routinely collected outcome data from the systemic clinical outcome and routine evaluation, 15 item (SCORE-15)—a valid and reliable measure of family functioning—from a sample of 980 participants attending the Family Residential Program. This study reported significant improvement in family functioning across all outcome variables between baseline and post-intervention, with no variables returning to pre-intervention levels at follow-up. Clinically significant changes in overall family functioning showed that 37% of participant scores moved from the clinical range at baseline to the nonclinical range post-intervention. This study represents the first empirical evaluation of the Family Residential Program, and the reported results provide compelling evidence for the program to effect improvement in family functioning for families with long-standing and severe difficulties. Poor rates of questionnaire completion following intervention frequent the literature base of family inpatient units, with low post-intervention (56%) and follow-up (12%) rates evident in this study. This study uniquely contributes to the growing evidence base of family inpatient units using rigorous evaluation methods.     

A Nonparametric Test of the Predictive Regression Model

This article considers testing the significance of a regressor with a near unit root in a predictive regression model. The procedures discussed in this article are nonparametric, so one can test the significance of a regressor without specifying a functional form. The results are used to test the null hypothesis that the entire function takes the value of zero. We show that the standardized test has a normal distribution regardless of whether there is a near unit root in the regressor. This is in contrast to tests based on linear regression for this model where tests have a nonstandard limiting distribution that depends on nuisance parameters. Our results have practical implications in testing the significance of a regressor since there is no need to conduct pretests for a unit root in the regressor and the same procedure can be used if the regressor has a unit root or not. A Monte Carlo experiment explores the performance of the test for various levels of persistence of the regressors and for various linear and nonlinear alternatives. The test has superior performance against certain nonlinear alternatives. An application of the test applied to stock returns shows how the test can improve inference about predictability.     

区域低碳发展指数建模——基于中国30省份的实证分析

区域低碳发展指数对于客观度量和对比不同地区的低碳发展水平具有重要的参考价值。综合空间距离法与人类发展指数的构建思路,从区域低碳经济、区域低碳能源效率、区域低碳环境三个维度构建了区域低碳发展指数模型,并运用中国30个省份2005-2011年的实际数据,对各区域的低碳发展水平进行了动态分析和地区差异对比研究,结果表明:样本期内低碳发展平均水平北京最高,宁夏最低;全国低碳发展水平稳中有升,但地区间的不平衡性有加剧的趋势;排名前30%的地区低碳发展差异性在缩小,排名后30%的地区之间不平衡性则逐渐趋于稳定;东部经济区的低碳发展水平最高,其次是中部和西部;聚类结果表明,按照低碳发展水平将各地区分为高、中、低三类是比较合适的。