Adaptive bootstrap tests and its competitors in the c-sample scale problem

This paper deals with a study of different types of tests for the two-sided c-sample scale problem. We consider the classical parametric test of Bartlett [M.S. Bartlett, Properties of sufficiency and statistical tests, Proc. R. Stat. Soc. Ser. A. 160 (1937), pp. 268–282] several nonparametric tests, especially the test of Fligner and Killeen [M.A. Fligner and T.J. Killeen, Distribution-free two-sample tests for scale, J. Amer. Statist. Assoc. 71 (1976), pp. 210–213], the test of Levene [H. Levene, Robust tests for equality of variances, in Contribution to Probability and Statistics, I. Olkin, ed., Stanford University Press, Palo Alto, 1960, pp. 278–292] and a robust version of it introduced by Brown and Forsythe [M.B. Brown and A.B. Forsythe, Robust tests for the equality of variances, J. Amer. Statist. Assoc. 69 (1974), pp. 364–367] as well as two adaptive tests proposed by Büning [H. Büning, Adaptive tests for the c-sample location problem – the case of two-sided alternatives, Comm. Statist.Theory Methods. 25 (1996), pp. 1569–1582] and Büning [H. Büning, An adaptive test for the two sample scale problem, Nr. 2003/10, Diskussionsbeiträge des Fachbereich Wirtschaftswissenschaft der Freien Universität Berlin, Volkswirtschaftliche Reihe, 2003]. which are based on the principle of Hogg [R.V. Hogg, Adaptive robust procedures. A partial review and some suggestions for future applications and theory, J. Amer. Statist. Assoc. 69 (1974), pp. 909–927]. For all the tests we use Bootstrap sampling strategies, too. We compare via Monte Carlo Methods all the tests by investigating level α and power β of the tests for distributions with different strength of tailweight and skewness and for various sample sizes. It turns out that the test of Fligner and Killeen in combination with the bootstrap is the best one among all tests considered.     

Computer support for continuous improvements

Abstract. The view of manufacturing has changed in recent years. This is evident from how the focus of management's attention is shifting more and more towards the basics of operating the business. The challenge to manufacturers in the West today is how to introduce leaner practices in their operations. The objective of this paper is to demonstrate how computer technology and information systems can be applied to support the transition to leaner practices in a complex operation. The problem with the large information systems developed to manage the complex operations of many Western companies is that they were designed to help maintain performance and not to support finding opportunities for new improved practices. Results from the ESPRIT II project, CIM for Multi-supplier Operations (CMSO), show that an existing data infrastructure can be effectively utilized to develop inexpensive, customized tools to support a process of continuous improvements. In this project a set of tools for planning the material flow from supplier to the assembly line was developed for the Saab-Valmet automobile assembly plant in Uusikaupunki, Finland. Hypertext tools were used to quickly develop decision support applications that supported problem solving and finding improvement potentials.     

美国大学生数学建模竞赛对我国高校数学教学的启示

作为数学建模领域内的国际性权威赛事,美国大学生数学建模竞赛受到了全世界各大高校的高度关注和重视,这项活动对于推动高校教育改革,尤其是对数学教育的改革有着重要意义。围绕开展美国大学生数学建模竞赛这一主题,简要阐述了该活动对于推动高校数学教育的地位和作用,同时对我国高校数学教学如何积极有效地培养学生创新精神和合作意识,把数学建模的思想融入到数学教学当中进行了思考。     

Needed but Not Liked – The Impact of Labor Market Policies on Natives’ Opinions about Immigrants

This article builds on the notion that immigrants’ integration into the labor market benefits migrants and shapes natives’ opinions about immigrants. Using insights from the newest literature on labor immigration and drawing upon the literature on attitudes toward immigrants, the article explores in a multilevel design the impact that regulations in the EU member states concerning immigrants’ access to domestic labor markets have on threat perceptions and on opinions about immigrants’ economic role. It finds that labor market regulations have a positive effect on opinions about immigrants’ economic role and reduce the negative relationships between precarious labor market status and opinions about the economic role. However, a robust effect of labor market regulations on threat perceptions was not found. Our results imply that labor market incorporation rules need to be accompanied by other measures to close the gap between natives and immigrants.     

跨文化能力递进——交互培养模式构建

全球化的迅猛发展使跨文化能力的重要性日益显现,并赋予跨文化能力以新的内涵。跨文化能力递进-交互培养模式是在现有跨文化能力培养模式的基础上,结合全球化语境对跨文化能力的新要求而提出的,以期为跨文化能力培养提供可供参考的实践模型。该模式以跨文化人格为培养目标,将知识、动机、技能、语境和效果五要素纳入其中,以全球化为语境,按照知识习得、动机培养、技能训练逐层递进的方式培养学习者的跨文化能力,注重交际双方的交流互动在实现交际效果和培养跨文化能力上的重要作用。     

Institutioneller Wettbewerb und Karrierechancen von Nachwuchswissenschaftlern in der Chemie

This paper examines the interplay between intensifying competition among scientific institutions, on the one hand, and career opportunities of young scientist, on the other hand, using chemistry-departments in German universities and non-academic research institutes as an example. Drawing on Bourdieu, we construct and analyze the filed in which institutional competition takes place. The power relations in the field are structured by the relative amount of “pure scientific capital” and/or “institutional capital” available. In an analysis of professorial appointments we show that the field’s structure has little impact on junior scientsits’ career opportunities. In contrast to the US, where pervasive institutional competition goes hand in hand with a high degree of social closure in academic careers, we find that career opportunities are (still) relatively open in the German case, in spite of growing competition. This openness is due to the special institutional framework that provides the German academic field with a relatively high degree of autonomy. As recent changes in science policy aim to alter the institutional framework, they also jeopardize the autonomy of the academic field.     

Religiös-konfessionelle Kultur und individuelle Religiosität: Ein Vergleich zwischen West- und Ostdeutschland

In religious terms, East and West Germany are still two separate societies more than 20 years after reunification. While the large majority of the population in West Germany belongs to one of the two main Christian churches, the proportion of those without a denomination in East Germany is now more than 70 %. Moreover, as far as church involvement, confidence in the church and individual religiosity are concerned, the West Germans have a much stronger religious affiliation to the church than their East German counterparts. The main reason for this difference is the influence of different political systems and legal cultures in East and West during the period when the two parts of Germany were divided. The fact, though, that the process of secularization has continued unabated in East Germany since 1989, and that the religious and ecclesiastical discrepancies between the two parts of the country have, if anything, become stronger rather than weaker since then, would suggest that there are other factors at work here, too. In this contribution, we argue that one of the factors that needs to be considered is the dominant denominational culture that exists in each of the two parts of the country, a culture which is highly persistent, can easily reproduce itself, puts pressure on the respective minority cultures, and is able to diffuse into them. While the dominant denominational culture in West Germany is able to slow down the current processes of secularization, the secular, non-denominational majority culture in the East tends rather to produce effects which accelerate these processes. In this essay, we use a variety of empirical indicators (effectiveness of religious socialization, denominational affiliation, churchly affiliation, faith in God) to demonstrate these effects.     

Political parties' perceptions and uses of anti‐Semitic conspiracy theories in Turkey

Despite its ever‐present and at times escalating significance, conspiracy theory is an under‐researched topic in the social sciences. This paper analyses the political influence of conspiracy theories by drawing on semi‐structured interviews with the representatives of four major political parties from the Turkish parliament about widespread anti‐Semitic conspiracy theories regarding Dönmes (converts). The findings indicate that right‐wing political parties problematize the secret character of the Dönme community and use the conspiracy theories to express their own ontological insecurities emerging from the Sèvres syndrome. Left‐wing and liberal parties conversely dissociate themselves from the conspiratorial rhetoric. The research concludes that the political parties reject or accept the conspiracy theories rationally and in alignment with their own ontological insecurities; by doing so, they pragmatically confirm their individual ideological perspective.     

Difficulties in Diagnosing Sexual Abuse in Children with Condyloma Acuminata in Turkey

Human papillomavirus is responsible for anogenital warts and could be regarded as an indicator of possible sexual abuse in children. A genital wart was detected during an investigation of anti–hepatitis C virus positivity in a four-year-old male patient. No pathological findings of another sexually transmitted disease were found except complete cleft palate and circumferential lesions in the perianal region. No family member was anti-hepatitis C virus positive, but the patient's uncle and his wife had genital condylomata. Although detailed physical examination uncovered no other findings indicative of sexual abuse, suspicion of abuse could not be eliminated. Therefore, we wanted to draw the attention of health professionals to the association of anogenital warts and sexual abuse.