A lower-bound oracle inequality for a blockwise-shrinkage estimate

Efromovich-Pinsker and Stein blockwise-shrinkage estimates are traditionally studied via upper-bound oracle inequalities, which bound the estimate's risk from above by the oracle's risk plus a remainder term. These bounds allow one to establish sufficient conditions for attaining the oracle's risk. To explore necessary conditions, this article develops a lower-bound oracle inequality, which bounds the estimate's risk from below by the oracle's risk minus a remainder term. In particular, the lower bound implies that thresholds must vanish for attaining the oracle's risk.     

Multivariate inverse Gaussian distribution as a limit of multivariate waiting time distributions

Multivariate inverse Gaussian distribution proposed by Minami [2003. A multivariate extension of inverse Gaussian distribution derived from inverse relationship. Commun. Statist. Theory Methods 32(12), 2285–2304] was derived through multivariate inverse relationship with multivariate Gaussian distributions and characterized as the distribution of the location at a certain stopping time of a multivariate Brownian motion. In this paper, we show that the multivariate inverse Gaussian distribution is also a limiting distribution of multivariate Lagrange distributions, which is a family of waiting time distributions, under certain conditions.     

安徽省农业贷支差异性的实证分析

本文分别选取从1998年1月至2004年2月连续74个月的安徽省短期贷款中的农业贷款余额和财政支出中的支农支出数据，利用季节预测法计算出1998年1月至2004年12月的农业贷款余额和支农支出值，将其与实际值比较得出：连续7年时间里，该省的农业贷款余额呈上升趋势，而支农支出却呈下降走势。最后就两者存在的走势差异性提出要切实加大对农业的支持，有必要结合经济增长趋势、消费价格指数等变量综合考虑如何更好地进行支农行为。     

基于分形理论下的外汇市场的预测

在全球金融一体化的大背景下，汇率的变动作为一个重要指标越来越被人们所重视，利用非线性特征来研究汇率问题已经成为研究的前沿和热点，将混沌与分形运用到汇率预测与汇率控制中是汇率研究的一个重要的分支。为此，分析了分形中的R/S方法，研究了转折点的选择；并以外汇市场中的美元、日元、欧元为例进行了实证分析，指出外汇市场服从分形分布； 运用该方法对外汇的变化进行分析，不仅得出汇率变化遵循有偏的随机游走，而且还预测出这三种汇率未来的走势。     

基于51单片机的小型温度测量系统

本文介绍了单线数字温度传感器DS18820的结构、特点、工作原理，设计了一种基于DS18820和AT89S52单片机的温度测量系统的硬件结构及汇蝙程序设计。     

论循环经济条件下建筑材料的开发与利用

在总结建筑材料开发与利用现状及存在的问题并深入分析其原因的基础上,遵循循环经济"减量化、再使用、再循环"的3R原则,从转变观念意识、加强科技创新、致力体制改革、严格管理等方面,提出了建筑材料开发与利用的对策。     

论20世纪中国文学城市叙事中的时间母题

现代性是关于时间意识的观念性阐释,而城市则是现代性的载体与集中呈现。文学中的城市书写与现代性的时间观念紧密相连。时间,既规训了城市的演变和现代人的生存方式,也造成了城市文学叙事的多元化与异质性。20世纪中国文学中的城市叙事,一定程度上就是作家关于时间的体验与想象性的表达。时间成为文学中城市叙事的母题,同时母题有关时间的不同表达方式也带来了城市叙事审美上的嬗变。     

托尼的中国研究及对费孝通乡村研究的影响

托尼的社会学研究在国内学术界被低估甚至被忽视了,他对中国的研究是经得起时间的考验的,也影响了当时中国学者的研究,典型的是费孝通的乡村研究,很大程度上是受到托尼的直接或间接影响。而托尼与费孝通共同的研究传统就是历史视角、整体视角,在此基础上研究中国农村,无论是从一般学术意义上,还是具体的中国当前农村问题的研究上,都具有很大的指导意义和参考价值,继承和发扬这一研究传统,是文化自觉和理论自觉的重要途径。     

Adaptive wavelet estimation of a density from mixtures under multiplicative censoring

In this paper, a mixture model under multiplicative censoring is considered. We investigate the estimation of a component of the mixture (a density) from the observations. A new adaptive estimator based on wavelets and a hard thresholding rule is constructed for this problem. Under mild assumptions on the model, we study its asymptotic properties by determining an upper bound of the mean integrated squared error over a wide range of Besov balls. We prove that the obtained upper bound is sharp.     

A Bayesian estimate of the concordance correlation coefficient with skewed data

Concordance correlation coefficient (CCC) is one of the most popular scaled indices used to evaluate agreement. Most commonly, it is used under the assumption that data is normally distributed. This assumption, however, does not apply to skewed data sets. While methods for the estimation of the CCC of skewed data sets have been introduced and studied, the Bayesian approach and its comparison with the previous methods has been lacking. In this study, we propose a Bayesian method for the estimation of the CCC of skewed data sets and compare it with the best method previously investigated. The proposed method has certain advantages. It tends to outperform the best method studied before when the variation of the data is mainly from the random subject effect instead of error. Furthermore, it allows for greater flexibility in application by enabling incorporation of missing data, confounding covariates, and replications, which was not considered previously. The superiority of this new approach is demonstrated using simulation as well as real‐life biomarker data sets used in an electroencephalography clinical study. The implementation of the Bayesian method is accessible through the Comprehensive R Archive Network. Copyright © 2015 John Wiley & Sons, Ltd.