Basic Process Capability Indices: An Expository Review

A review of the four basic process capability indices has been made. The interrelationship among these indices has been highlighted. Attention has been drawn to their drawbacks. The relation of these indices to the proportion nonconforming has been dwelt upon and the requirement of the adequate sample size has been emphasized. Cautionary remarks on the use of these indices in the case of nonnormal distributions, skewed distributions, and autocorrelated data are also presented. The effect of measurement error on process capability indices has been dealt with in great detail.     

Random non-response in multi-character surveys

In the present investigation, we have made first shot to propose an alternative estimator of population total, in the presence of random non-response, for multi-characteristics by using probability proportional to size and without replacement (PPSWOR) sampling when the selection probabilities are poorly correlated with the study variables. The mean square error (MSE) expressions are derived for the proposed estimator. The behavior of the proposed estimator has been examined under super population model. An empirical study has also been carried out to look into the performance of the proposed estimator. The proposed estimator has been applied to real data set.     

珠江三角洲地区港口竞争与合作研究

一段时期以来,关于我国沿海港口是否存在过度建设和竞争过于激烈的讨论令人关注,特别是在长江三角洲和珠江三角洲两个港口群密集地区.作者选取了珠江三角洲地区的港口作为研究对象.文章从是否属于区域性港口的角度,分析了各港口运量增长、航线分布、内外贸定位、服务与运作效率,以及港口供给能力与需求的差距等方面.研究结果表明,珠江三角洲地区大小港口职能分工相对明确,在珠江三角洲经济强劲增长的推动下,港口之间的合作大于竞争.     

加快企业信息化建设,提高统计工作职能

在企业从事统计工作多年,伴随着企业信息化建设步伐的加快,统计方法在不断完善,工作效率不断提高,越来越意识到企业信息化建设对于提高统计工作职能的重要意义。     

几类非线性协整模型研究综述

协整分析方法经过20多年的发展成为计量经济学界的一个前沿工具,在经济与金融领域得到了广泛的应用。线性协整分析已经成熟,而非线性协整的理论与方法仍在持续研究中。本文回顾了最近20年非线性协整的发展历史,其中包括结构变化、门限非线性、马尔可夫转换和平滑转换等几类非线性协整模型,强调了这些非线性机制的本质区别,总结了已取得的一些重要研究成果,最后对该问题的最新发展动向加以概括。     

The Brand Choice Model of Wine Consumers: A Multinomial Logit Model

The objective of this study is to determine factors influencing brand preferences of wine consumers in the Marmara region where viniculture and wine production is so important in Turkey. First, the consumers’ preferences survey has been conducted with 1022 persons in the region randomly selected and evaluated. Then, the informative factors influencing brand preferences collected in these surveys have been determined by the multinomial logit model. A lot of independent variables have been used in the multinomial logit model, but, because some independent variables were not found as significant according to Likelihood Ratio test, these variables are not included in the multinomial logit analysis. Six important factors influencing wine brand preferences have been determined. These factors are brand change causes of consumers, occupation of consumers, marital status of consumers, birthplace of consumers, income of consumers and gender of consumers. In addition, whether the wine brand preferences are independent, has been tested with Testing Independence of Irrelevant Alternatives of Hausman. According to this test, it has been found that the wine brand preferences are independent.     

中国分省区FDI的引进效率评价与解析

本文用非参数DEA方法评价和分析了中国各省区1998～2000年和2001-2003年两个时期FDI的引进效率。研究发现，在1998-2000年优势充分发挥的省区是：福建、广东、广西和海南，优势发挥严重不足的地区是青海和新疆；在2001-2003年优势充分发挥的省区是：江苏、江西和海南，优势发挥严重不足的地区是宁夏和新疆。效率分解的结果使我们发现新疆效率低下的主要原因是规模效率低下，宁夏效率低下的主要原因是拥挤测度太低，而青海效率低下的原因则是来自规模效率和拥挤测度两方面。     

Recruitment Source Research: Current Status and Future Directions

The effectiveness of different recruitment sources for new employees has been the topic of speculation and research for over 50 years. Effectiveness has primarily been assessed by examining turnover/job survival rates and job performance. As reported in most narrative reviews and all five quantitative reviews, referrals by current personnel, in-house job postings, and the re-hiring of former employees are the most effective sources. Walk-ins have been slightly less effective, and the least effective sources are newspaper ads, school placement services, and employment agencies (government/private). Over these 50 years, six explanations for this pattern have been offered. They are summarized and evaluated here. The practical usefulness of recruiting from effective sources is estimated, based on the effect sizes from our meta-analysis. Finally, suggestions for future research are made.     

On a Morgenstern-type bivariate gamma distribution

Summary In this paper a Morgenstern-type bivariate gamma distribution has been studied. Its moment generating function has been derived. The distribution of the product and quotient are derived in terms of the modified Bessel function. The results for the independent case follow as special cases. Further the regression function has been analysed, in terms of its deviation from linear regression function.This research was initiated while the first author was a U.N. Consultant under the Statistical Training Program for Africa, visiting the University of Ghana.     

《反垄断法》的实施效应评估

我国《反垄断法》实施两年来,既产生了及时有效保护竞争和维护正常市场竞争秩序的积极效应,也存在"经济宪法"地位是否凸显、执法效应偏离反垄断法目标、私益保护乏力的论争。结合应然效应和美国等主要国家《反垄断法》的实践,科学理性地评估我国《反垄断法》的实施效应,建议在WTO核心原则框架下实现《反垄断法》实施的良好效应。     

The practitioner-academic gap: A view from the middle

The practitioner-academic gap has been widely discussed for decades along with recommendations for increasing the practical application of management research. We review some of the reasons for this disconnect and argue this has been the norm going back to the beginnings of the field. At the same time contemporary management practice has obviously been greatly influenced by management research. We suggest that much of this influential work has been done by academics who choose to work in the middle between university and practice. We review the experience of the Center for Effective Organizations and others working in the middle to make recommendations for doing useful research and suggest there are reasons for optimism in research to practice transfer in a changing landscape.     

Diagnostic Tests for the Necessity of Weight in Regression With Survey Data

To weight or not to weight in regression analyses with survey data has been debated in the literature. The problem is essentially a tradeoff between the bias and the variance of the regression coefficient estimator. An array of diagnostic tests for informative weights have been developed. Nonetheless, studies comparing the performance of the tests, especially for finite samples, are scarce, and the theoretical equivalence of some tests has not been investigated. Focusing on the linear regression setting, we review a collection of such tests and propose enhanced versions of some of them that require an auxiliary regression model for the weight. Further, the equivalence of two popular tests is established which has not been reported before. In contrast to existing reviews with no empirical comparison, we compare the sizes and powers of the tests in simulation studies. The reviewed tests are applied to a regression analysis of the family expenditure using the data from the China Family Panel Study.     

Learning for sharing: an empirical analysis of organizational learning and knowledge sharing

Knowledge is one of the most strategically important resources to sustain competitive advantage in an organization. So its creation and management has attracted the attention of managers and researchers alike. Organizational learning has been positively associated with innovation and performance and knowledge sharing has been associated with innovation performance. Although, some authors argued that organizational learning and knowledge sharing are complementary, there are few studies that have empirically tested the relationship between them. The purpose of this study was to analyze its relation and to empirically test it in the hospitality industry. Based on the results of the structural equation modeling approach on 244 Spanish hotels we confirmed a positive relationship between the variables. The findings are discussed; implications and future lines of research are presented.     

Analysis of Visitor Decision Making System When Visiting Natural Recreation Sites by Multinomial Logit Model

Multinomial Logit Model has analyzed the relationship between the frequency of visits to recreation areas and the motivational factors affecting the visits. Kastro Environment Preserving Site that is located in the Black Sea coast of Marmara region in Turkey, has been chosen as the site for this study. Kastro bay is a natural park that is visited only for recreational visits. The study has been conducted on a photogenic study group due to the proximity factor of Kastro bay close to Istanbul. Kastro bay is a popular recreational park due to its characteristic advantages such as a 200 m wide and approximately 2.5 km long beach and with its high quality vegetation. The vegetation type includes ash tree, oak tree, black pine, sand lily etc. Kastro bay is also the site for the Mediterranean seals (Monachus-monachus) which are at the level of extinction. Approximately 50,000 visitors visit the region during the months of July and August. It has been concluded that there is high direct correlation between the frequency of visits and the motivational factors. It has been determined that the visits are mostly based on the sea and the ecological tourism.Jel: O13, Q20, Q26, Q51, Q56, Q57     

Quality Level and Price in Turkish Durum Wheat Market

This study has been made to assess the influences and effects of durum wheat quality characteristics on the prices in Turkish durum wheat market. The current prices are determined as the result of the applied analysis, in respect to the quality characteristics of durum wheat. The Turkish durum wheat varieties are compared with the wheat varieties of other countries, from where Turkey is importing durum wheat in respect to the quality characteristics. It has been assessed that hectoliter and glassware are the major factors that have the greatest effect and influence on Turkish durum wheat market in respect to the quality aspects.     

Measuring environmental effects on property values without hedonic regressions

The effect of environmental nuisances on property values has been frequently studied using hedonic regressions, yet that method has extensive data and estimation requirements. The technique developed in this paper uses repeat sales on houses to substantially reduce these requirements. The technique adjusts for depreciation between sales and allows for nonzero error covariance terms when a house has been sold more than twice. The effect of highway noise on property values is studied using this method, and the results are statistically equivalent to the results of an extensive hedonic study for the same area.     

浅谈贝氏体钢钢轨、辙叉、尖轨在朔黄线的应用

随着朔黄铁路运量的增加,运输压力越来越大,对线路设备质量的要求越来越高。钢轨、道岔是线路设备中最重要的环节,辙叉、尖轨又是道岔的关键部件。实践表明,贝氏体钢辙叉、尖轨、基本轨采用大大提高了道岔使用寿命,增加了安全系数,创造更多的经济效益和社会价值。     

“互联网+”思维下图书馆服务创新探究

我国经济取得的巨大进步推动了我国科学技术的不断更迭,信息技术和网络技术已经在我国社会得到了全面普及,人们日常的生产、生活都与信息技术和网络技术息息相关。当前,互联网技术已经非常成熟,并且已经应用于我国的各个行业。在这样的社会背景下图书馆服务想要有所发展,就必须引入“互联网+”的思维模式,通过创新服务手段,完善图书馆服务,使得图书馆能够更好地为读者服务。     

基于PLC的选煤厂集控系统的设计与应用

介绍了基于PLC的选煤生产集控系统组成结构、系统功能及实现方法,讨论了PLC在该系统中的应用、各控制模块的功能以及通信网络等部分的设计方法。实际应用表明该系统在节能降耗、安全生产等方面取得了良好的效果。     

材料配比及施工因素对弹性环氧砂浆性能的影响分析

弹性环氧砂浆在水工混凝土建筑物的破损修补及抗冲磨防护结构中得到应用，但其在应用中常出现开裂等各种破坏现象。文章结合试验及施工中的现象，从配比及施工因素两方面对环氧砂浆的应用进行分析和讨论，并提出一些合理的建议。