Robust 2k factorial design with Weibull error distributions

It is well known that the least squares method is optimal only if the error distributions are normally distributed. However, in practice, non-normal distributions are more prevalent. If the error terms have a non-normal distribution, then the efficiency of least squares estimates and tests is very low. In this paper, we consider the 2^k factorial design when the distribution of error terms are Weibull W(p,σ). From the methodology of modified likelihood, we develop robust and efficient estimators for the parameters in 2^k factorial design. F statistics based on modified maximum likelihood estimators (MMLE) for testing the main effects and interaction are defined. They are shown to have high powers and better robustness properties as compared to the normal theory solutions. A real data set is analysed.     

变径对称振子的通用电流积分方程

本文从电磁场位的基本慨念出发,根据振子表面边界条件导出了变径对称振子的通用电流积分方程,并以圆柱,双锥等几种特殊情况的变径对称振子为例进行了验证。     

Extending conditional likelihood in models for stratified binary data

The conditional likelihood is widely used in logistic regression models with stratified binary data. In particular, it leads to accurate inference for the parameters of interest, which are common to all strata, eliminating stratum-specific nuisance parameters. The modified profile likelihood is an accurate approximation to the conditional likelihood, but has the advantage of being available for general parametric models. Here, we propose the modified profile likelihood as an ideal extension of the conditional likelihood in generalized linear models for binary data, with generic link function. An important feature is that for the implementation we only need standard outputs of routines for generalized linear models. The accuracy of the method is supported by theoretical properties and is confirmed by simulation results.This research was supported by MIUR COFIN 2001-2003.     

Two kinds of restricted modified estimators in linear regression model

In this paper, we introduce two kinds of new restricted estimators called restricted modified Liu estimator and restricted modified ridge estimator based on prior information for the vector of parameters in a linear regression model with linear restrictions. Furthermore, the performance of the proposed estimators in mean squares error matrix sense is derived and compared. Finally, a numerical example and a Monte Carlo simulation are given to illustrate some of the theoretical results.     

转基因水稻发展的社会支持网络运行策略

转基因作物的研发和产业化的推进是一个复杂的系统工程。转基因水稻发展的社会支持网络能够照顾到相关的利益群体,缓解转基因水稻推进过程中面临的各种阻力。为使转基因水稻发展的社会支持网络的良性运行,策略上应该做到：技术创新要充分考虑社会需求;充分发挥政府的主导作用;积极塑造转基因水稻＂绿色、有机＂的社会形象;实行差异化价格策略;实施整合传播等。     

社会科学视角下的转基因相关学术概念分类与检视

转基因出现在我国的社会科学研究场域中,并结合社会科学研究范式而形成的一些关键概念术语,是最近10年的事情。在我国转基因相关问题10多年的研究进程中,社会科学研究者对同一概念术语使用了很多不同的称谓,造成了不同的理论视域和研究倾向之间一定的隔阂与混乱。通过结构分析的方法和思路,把与转基因本质相联系的关键概念术语加以界定,并归纳为以下3类：技术相关类概念术语、问题相关类概念术语、实践应用类概念术语,以此形成理论和实践的良性互动。     

上证指数波动率和收益率长期依赖关系的实证研究

运用经典的和修正过的重标极差方法研究了在1999到2009上证指数中的波动率和收益率的长期依赖关系。运用具有预白（pre-whitening）和后黑（postblackening）的Moving block bootstrap方法为假设检验构建置信区间。结果显示上证指数的收益率没有显著的长期相关。但是,波动率具有显著的长期相关。关于收益率的研究和之前一些研究提出的中国股票市场具有可持续性的结论相抵触。并且,之前这方面的研究大多数没有运用置信区间或只是基于标准正态分布的置信区间。因此,这些研究的结果需要从新检验和从新进行解释。     

The effect of Phase I sample size on the run length performance of control charts for autocorrelated data

Traditional control charts assume independence of observations obtained from the monitored process. However, if the observations are autocorrelated, these charts often do not perform as intended by the design requirements. Recently, several control charts have been proposed to deal with autocorrelated observations. The residual chart, modified Shewhart chart, EWMAST chart, and ARMA chart are such charts widely used for monitoring the occurrence of assignable causes in a process when the process exhibits inherent autocorrelation. Besides autocorrelation, one other issue is the unknown values of true process parameters to be used in the control chart design, which are often estimated from a reference sample of in-control observations. Performances of the above-mentioned control charts for autocorrelated processes are significantly affected by the sample size used in a Phase I study to estimate the control chart parameters. In this study, we investigate the effect of Phase I sample size on the run length performance of these four charts for monitoring the changes in the mean of an autocorrelated process, namely an AR(1) process. A discussion of the practical implications of the results and suggestions on the sample size requirements for effective process monitoring are provided.     

从主名词角度论连体修饰句的动词时制

日语中的动词除了作为谓语出现在句末，还可以在连体修饰句中出现。通过具体例句，从主名词的角度论述了连体修饰句动词的时制问题，分别是相对名词、内容句名词、关系句名词、特征名词等几方面，从中发现，修饰句中动词的时制比较复杂，往往要受多方面因素的制约，实际使用中需要认清主名词的内在特点，注意主句事态与修饰句事态发生的时间先后，以及相关固定用法等。