Effect of missing plots in some response surface designs

The effect of one or more missing observations for response surface designs arranged in blocks are examined in this paper. The resu lts as applied to a central composite design with orthogonal blocking, and an equirdial design with orthogonal blocking, are reported.     

Inference from PseudoLikelihoods with Plug‐In Estimates

Effective implementation of likelihood inference in models for high‐dimensional data often requires a simplified treatment of nuisance parameters, with these having to be replaced by handy estimates. In addition, the likelihood function may have been simplified by means of a partial specification of the model, as is the case when composite likelihood is used. In such circumstances tests and confidence regions for the parameter of interest may be constructed using Wald type and score type statistics, defined so as to account for nuisance parameter estimation or partial specification of the likelihood. In this paper a general analytical expression for the required asymptotic covariance matrices is derived, and suggestions for obtaining Monte Carlo approximations are presented. The same matrices are involved in a rescaling adjustment of the log likelihood ratio type statistic that we propose. This adjustment restores the usual chi‐squared asymptotic distribution, which is generally invalid after the simplifications considered. The practical implication is that, for a wide variety of likelihoods and nuisance parameter estimates, confidence regions for the parameters of interest are readily computable from the rescaled log likelihood ratio type statistic as well as from the Wald type and score type statistics. Two examples, a measurement error model with full likelihood and a spatial correlation model with pairwise likelihood, illustrate and compare the procedures. Wald type and score type statistics may give rise to confidence regions with unsatisfactory shape in small and moderate samples. In addition to having satisfactory shape, regions based on the rescaled log likelihood ratio type statistic show empirical coverage in reasonable agreement with nominal confidence levels.     

A Class of Pseudolikelihood Ratio Tests for Homogeneity in Exponential Tilt Mixture Models

Mixture models are commonly used in biomedical research to account for possible heterogeneity in population. In this paper, we consider tests for homogeneity between two groups in the exponential tilt mixture models. A novel pairwise pseudolikelihood approach is proposed to eliminate the unknown nuisance function. We show that the corresponding pseudolikelihood ratio test has an asymptotic distribution as a supremum of two squared Gaussian processes under the null hypothesis. To maintain the appeal of simplicity for conventional likelihood ratio tests, we propose two alternative tests, both shown to have a simple asymptotic distribution of under the null. Simulation studies show that the proposed class of pseudolikelihood ratio tests performs well in controlling type I errors and having competitive powers compared with the current tests. The proposed tests are illustrated by an example of partial differential expression detection using microarray data from prostate cancer patients.     

运用系统论分析团体贷款复合系统的稳定性

运用系统论的方法,把团体贷款、农业经济和外在环境三个子系统协调度综合起来考查,并结合主成分分析法得出系统发展指数和系统稳定性.进一步,对该系统进行协调评价,最终得出团体贷款、农业经济和外在环境三个子系统所组成的复合系统协调发展的具体条件.     

宜昌长江铁路大桥施工控制及仿真分析

宜昌长江铁路大桥为连续刚构柔性拱组合结构,采用悬臂浇筑施工法进行施工。本文以该桥作为工程背景,运用现代控制理论,将参数识别法应用到施工控制中,采用专用空间有限元软件MI-DAS/CIVIL对其施工全过程进行仿真分析,通过对各施工阶段的应力和挠度变化规律的总结和完善的施工监测体系,对其应力控制进行成功的运用,取得了满意的效果。     

钙钛矿锰氧化物颗粒边界异质改性及低场磁电阻效应研究

综述了近几年钙钛矿锰氧化物磁电性质及CMR效应研究进展;综述了低场磁电阻研究现状,着重阐述了通过对钙钛矿锰氧化物的颗粒界面异质改性,实现低场磁电阻的方法,并提出利用A位稀土掺杂钙钛矿锰氧化物与金属颗粒复合实现低场磁电阻的设想。     

基于复合DEA的制造企业电子商务价值链优劣测评

利用复合数据包络分析方法，对传统制造企业向电子商务转型后形成的电子商务价值链进行了分析，找出其新增价值和新增成本，进行价值链优劣测评，拟定类型企业应根据其不同的指标表现确定不同的工作重点。     

Frequentist-Bayesian Monte Carlo testing

Abstract

Conventional methods for statistical hypothesis testing has historically been categorized as frequentist or Bayesian. But, a third option based on a reconciling hybrid frequentist-Bayesian framework is quickly emerging. Although prominent, there are applications where the exact hybrid test is not computable. For such cases, the present paper introduces a straightforward Monte Carlo procedure for performing frequentist-Bayesian testing.     

在电子行业应用电镀技术的现状和展望

对应用在电子行业中的合金电镀和复合技术的现状作了简要的综述,并分析电镀技术变革的主要原因,以及对新世纪里在电子行业中电镀新技术的需求和展望进行了论述.     

一种求解光学厚层渐近公式的新方法

根据Mie理论和辐射传输理论,利用迭代法结合高斯-勒让德积分,求解了Ambartsumian非线性积分方程,得到了光学半无限长粒子层的反射函数;利用半无限长粒子层的反射函数,推导了逃逸函数、漫射指数、漫射强度等参数的求解方程组.基于此方法,以典型的积云为例,计算了在0.4—5μm范围内各参数的谱分布.