Wie können „bildungsferne“ Gruppen für ein Hochschulstudium gewonnen werden?

Against the background of the relatively low enrolment of students at universities, the minor proportion of academics at the population, and the distinctive social inequality at the transition to the tertiary education in Germany, it is assumed that – additionally to the structure of the educational system – primary and secondary effects of social origin are responsible for that the working class children are underrepresented at German universities. According to empirical findings for high-school graduates, their subjectively expected success in university training in general as well as their educational decision on continuing tertiary education, in particular, are crucial for this empirical fact of persistent inequalities of university education. If one cancels out the secondary effects of social origin, the participation of working class children could be increased more significantly than by neutralizing the primary effects. If one neutralizes also the secondary effects at both, the first and the second transition in the individuals’ educational course, the individuals’ transition to the sector of tertiary education could be increased additionally. Both, the selection and filter processes of the Germany school system as well as individuals’ educational choices provide the counterproductive effect that the talented offspring from socially disadvantaged classes will be diverted away from the higher education and the universities.     

Characterizations of Lorenz curves and income distributions

The purpose of this paper is to propose and justify the use of a few measures of inequality for summarizing the basic information provided by the Lorenz curve. By exploiting the fact that the Lorenz curve can be considered analogous to a cumulative distribution function it is demonstrated that the moments of the Lorenz curve generate a convenient family of inequality measures, called the Lorenz family of inequality measures. In particular, the first few moments, which often capture the essential features of a distribution function, are proposed as the primary quantities for summarizing the information content of the Lorenz curve. Employed together these measures, which include the Gini coefficient, also provide essential information on the shape of the income distribution. Relying on the principle of diminishing transfers it is shown that the Lorenz measures, as opposed to the Atkinson measures, have transfer-sensitivity properties that depend on the shape of the income distribution. Received: 20 July 1998/Accepted: 10 September 1999     

Optimizing trial design in pharmacogenetics research: comparing a fixed parallel group,group sequential,and adaptive selection design on sample size requirements

Two‐stage clinical trial designs may be efficient in pharmacogenetics research when there is some but inconclusive evidence of effect modification by a genomic marker. Two‐stage designs allow to stop early for efficacy or futility and can offer the additional opportunity to enrich the study population to a specific patient subgroup after an interim analysis. This study compared sample size requirements for fixed parallel group, group sequential, and adaptive selection designs with equal overall power and control of the family‐wise type I error rate. The designs were evaluated across scenarios that defined the effect sizes in the marker positive and marker negative subgroups and the prevalence of marker positive patients in the overall study population. Effect sizes were chosen to reflect realistic planning scenarios, where at least some effect is present in the marker negative subgroup. In addition, scenarios were considered in which the assumed ‘true’ subgroup effects (i.e., the postulated effects) differed from those hypothesized at the planning stage. As expected, both two‐stage designs generally required fewer patients than a fixed parallel group design, and the advantage increased as the difference between subgroups increased. The adaptive selection design added little further reduction in sample size, as compared with the group sequential design, when the postulated effect sizes were equal to those hypothesized at the planning stage. However, when the postulated effects deviated strongly in favor of enrichment, the comparative advantage of the adaptive selection design increased, which precisely reflects the adaptive nature of the design. Copyright © 2013 John Wiley & Sons, Ltd.     

Wenn weiße Schafe krampfhaft nach schwarzen suchen ... und sich dabei dreckig machen! Replik auf den Beitrag von Jochen Gläser

Ohne Zusammenfassung     

From consensus to credibility

The development of consensual science has greatly influenced the international environmental negotiation processes. This is not least the case for the Convention on Long‐range Transboundary Air Pollution (CLRTAP). Negotiators as well as regime analysts regard CLRTAP as a successful example of how scientists have succeeded in influencing international policy making through consensus‐building strategies. Drawing on Ulrich Beck's work on reflexive scientization and the concept of ‘stage management’ from the field of the Sociology of Scientific Knowledge (SSK), this paper critically analyzes the role of science in the regulation of transboundary air pollution. It discusses the consensus‐building strategies developed by scientists as well as contemporary strategies for making science matter in regulative work. It is argued that scientific credibility is crucial for attracting political and public attention, but that credibility does not necessarily have to be based on scientific consensus. The challenge for science is not so much to create consensus but to strengthen its credibility by elaborating new relations with its stakeholders.     

Prediction of Chaotic Time Series in the Presence of Measurement Error: the Importance of Initial Conditions

In this paper we argue that even if a dynamic relationship can be well described by a deterministic system, retrieving this relationship from an empirical time series has to take into account some, although possibly very small measurement error in the observations. Therefore, measuring the initial conditions for prediction may become much more difficult since one now has a combination of deterministic and stochastic elements. We introduce a partial smoothing estimator for estimating the unobserved initial conditions. We will show that this estimator allows to reduce the effects of measurement error for predictions although the reduction may be small in the presence of strong chaotic dynamics. This will be illustrated using the logistic map.     

Postmodern‐oriented practices and patient‐focused research: possibilities and hazards

In this article two streams of thought within family therapy, one representing a traditional research focus and the other postmodern oriented practices are brought together. A qualitative study is described that used standardised measures to monitor therapeutic practice and provide feedback on process and outcome to therapists. The opportunities and pitfalls concerning this approach are discussed and illustrated. The use of measures as conversational tools increases and expands opportunities for collaboration between children, parents and their therapists. However, in organisations these measures risk becoming tools of competition instead of conversation, which is helped when managers take responsibility for implementing and supporting a culture of feedback.     

Suicide in Adolescent American Indians: Preventative Social Work Programs

Suicide is a leading social problem among the adolescent American Indian community. This literature review examines the demographics of American Indian adolescents who attempt suicide, along with the effects it has on the entire family/community. This paper describes various programs used to address individuals, while correlating them to specific use within the American Indian population. The authors look at the effectiveness of the Adolescent Suicide Prevention Project, American Indian Life Skills Development Curriculum, and Zuni Life Skills Development, along with the draw-backs associated with the implementation of each program. The importance of incorporating culturally specific programs and addressing the issue at a community level in an attempt to enhance the well-being of at-risk American Indian Adolescents is emphasized.