A bivariate gamma mixture distribution

In this paper we construct a bivariate gamma mixture distribution by allowing the scale parameters of the two marginals to have a generalized Bernoulli distribution. We study the statistical properties of this distribution and discuss the estimation of the parameters. The distribution is then fitted to two bivariate data sets. Data on the age and lactation period of cows are described well by the proposed model, but it fails to fit Johansen's bean data properly because of theoretical constraints on the correlation.     

Technological Diversification and Organizational Divisionalization: The Moderating Role of Complementary Assets

This study uses data on 582 electronics and information technology firms in Taiwan for the period 1997–2005 to investigate the hypothesis that technological diversification increases the extent of organizational divisionalization under firm growth. This study applies competence‐based theory to argue that firms spread the technological competence base to achieve firm growth. However, in the face of firm growth, managers of multi‐technology firms often utilize a multi‐division structure to manage their various technologies based on their operating characteristics or needs. Furthermore, the findings of this study indicate that complementary assets moderate the negative relationship between technological diversification and organizational divisionalization. For firms with specialized complementary assets, multi‐technology firms may be observed to consolidate related‐technology activities into fewer divisions, facilitating the utilization of these complementary assets in conjunction with other divisions.     

Box–Cox transformation for spatial linear models: a study on lattice data

In this article, we extended the classic Box–Cox transformation to spatial linear models. For a comparative study, the proposed models were applied to a real data set of Chinese population growth and economic development with three different structures: no spatial correction, conditional autoregressive and simultaneous autoregressive. Maximal likelihood method was used to estimate the Box–Cox parameter λ and other parameters in the models. The residuals of the models were analyzed through Moran’s I and Geary’s c.     

Lag Order and Critical Values of the Augmented Dickey–Fuller Test

Response surface analysis is used to obtain approximate finite-sample critical values for the augmented Dickey–Fuller (ADF) test. Previous studies estimating the critical values for the test have generally ignored their possible dependence on the lag order. This study shows that the lag order, in addition to the sample size, can affect the finite-sample behavior of the test. The result points to the importance of correcting for the effect of lag order in applying the ADF test.     

杂多酸HPWA液相催化合成乙酸正丁酯

本文报导杂多酸HPWA对乙酸正丁酯液相合成反应的催化行为,通过对几种催化剂的催化作用比较、杂多酸HPWA用量不同的催化效果以及杂多酸重复使用效果的实验,发现杂多酸HPWA对乙酸正丁酯液相合成反应的催化作用明显优于硫酸等催化剂,是一种效果良好的液相合成乙酸正丁酯的催化剂。     

界限分析与批判:当代哲学重要的工作方式

"界限分析"是哲学十分重要的一种工作方式,它使哲学摆脱传统哲学观不切实际的自我期待,使哲学在当代知识背景和社会生活语境中重获生机与活力."界限分析"的工作方式可以在"语言"、"知识"、"存在"和"价值"四个基本层面上进行.它集中体现了哲学最为根本的精神气质,即批判性,因而将为哲学的当代合法性提供有力的自我辩护.     

净化美化优化亲商安商富商--营口市投资环境概述

近期,在辽宁经贸代表团赴日赴韩赴港招商中,营口市成绩斐然,分别名列全省第二至三位,一时成为热点亮点彩点.这与营口的优越的投资环境密不可分.     

企业团建必须实现服务企业与服务青年的结合

企业团建要实现服务企业与服务青年的结合,必须坚持党的领导、加强党、政、团联系,坚持青年理想教育的生动活泼、讲求实效,做到寓教育于活动,促使志愿者行动的制度化、规范化、经常化;深入开展青年岗位能手、青年文明号、安全生产、突击生产、创新创效活动;在加强团的基层组织建设、加强团干队伍建设方面,调整团的运作机制以适应企业发展需要。     

汽车悬架球铰总成动态试验台的研制

分析了汽车悬架球铰总成动态试验台的技术特点,阐述了其控制原理和研究路线.     

Reduction of control-chart signal variablity for high-quality processes

The design of a control chart is often based on the statistical measure of average run length (ARL). A longer in-control ARL is ensured by the design, but the variance run length distribution may also be large for such a design. In practical terms, the variability in false alarms and true signals may be large. If the sample size for plotting a point is not constant, then the focus is on the average number inspected as against the ARL. This article considers two well-known attribute control chart procedures for monitoring high quality based on the number inspected, and shows how the variability in false alarms and correct signals can be reduced.