The property of invariance—well-known for a single test problem—is extended to multiple test problems. It is shown that the invariance of the components of a multiple test is necessary and sufficient for the multiple test to be invariant. Furthermore, the invariance of stepwise procedures is investigated. An example is given addressing some related aspects. 相似文献
Human resources development in South Africa is constrained by the underpreparedness of many students for university. The problem is particularly acute among school leavers for whom English is not their first language and who are thereby at a disadvantage in an English language university. In order to address the problem, which goes beyond language, bridging curricula have been devised. This research analyses how effective one such intervention is, in terms of an academic achievement outcome.
Decisions to allocate resources to bridging intervention need the assurance that the resources are used effectively. An ex post facto experimental research design ts used in this study to test the learning outcome of the PBS bridging intervention. The analysis assesses whether the PBS programme increases the academic achievement of students at first‐year level.
The examination results achieved by an experimental group of PBS students who matriculated from DET schools are compared with the results of a control group of DET matriculants. The research shows that the academic achievements of the PBS group during the bridging year were superior to those of the control group. Furthermore, superior performance was sustained by the PBS students after they Joined the mainstream BCom curriculum. After the bridging intervention, the PBS students achieved 7.7 percentage points better in Business Economics I examinations than the control group. The research design controls for demonstrated academic ability at school At a 0.01 level of statistical significance, the results of the analysis indicate that the PBS intervention has contributed positively to the students’ academic achievement. 相似文献
In recent years the re-engineering of R&D functions in large multinationals has often been accompanied by the emergence of groupware applications as strategic decision-making tools, while the organization of work has shifted towards various forms of teamworking. There is however, little empirical evidence on the conditions and processes through which groupware and teamworking practices can be efficiently linked. This paper examines the experience in groupware adoption by two large multinationals, Hoffmann la Roche and Unilever, in selected areas of new product development: the final New Drug Application phase for a new anti AIDS drug in Roche and the development along an 'innovation funnel' of new oral care products in Unilever. Despite the variety of tasks, organizations, missions and technology deployed, similar themes seem to emerge regarding how large organizations are able to 'host' the new groupware applications. Learning processes seem to play a key role in the final integration of the technology in the workflow. Still, what seems to emerge is that despite its critical role, learning is not a sufficiently valued competence, at least in the organizations examined. As a consequence, the innovations tend to drift, lead to unexpected outcomes and many opportunities for learning from (mistakes and) innovations are simply missed. Factors responsible for such a state of affairs seem to be the power of the hierarchical context into which groupware and teamwork are introduced; the continuous jolts to which such context must undergo because of radical shifts in management and R&D strategy; the dialectics between local and global changes. 相似文献
The new EEG 2012 law opens up for more parties to participate in the trading of wind and solar power, because of the bonus system that now compensates everybody for all market relevant costs, not only the Transmission System Operators. Therefore it can be expected, that the trading of renewable energies by private parties will increase. One of the central questions to be answered is how efficient does a balance responsible party have to be to stay competitive also with a small pool. The quantification of balance costs for different trading strategies is however complex and non-trivial. We propose a methodology in this study that accounts for this fact. Additionally, we analyse and show the requirements and the monetary value of Intra-Day trading for the handling of wind and solar power. The trading strategies proposed in this article make use of an uncertainty band around the forecasts used in the Intra-Day, in order to avoid double trading and thereby reducing the total balancing volume and the associated costs. 相似文献
This literature review offers a rigorous approach, incorporating both quantitative and qualitative techniques, to examine research to date in the field of socially and environmentally responsible procurement (SERP). It identifies that the SERP literature is at a critical juncture in its development and that researchers should be aware of the literature's shortcomings and potential points of fragmentation. This is of considerable importance if the field is to become a salient issue in the wider management literature. As such, this review not only takes stock of the existing literature, but it provides a comprehensive and systematic analysis of existing contribution and their implications for practitioners. In addition, we highlight the avenues for future research, which has so far been neglected by academics, but which is critical from a practitioners and implementation perspective. 相似文献
An efficiency‐wage model of steady‐state equilibrium with labor‐augmenting technical progress is developed to explore the long‐run relationship between unemployment and growth. The rate of productivity growth is either specified exogenously or determined endogenously. In both cases, we preserve key results of the Shapiro–Stiglitz efficiency‐wage analysis without growth. Our model, however, also yields some striking new results. For instance, an exogenous increase in the growth rate may raise the rate of efficiency‐wage unemployment, and a once‐for‐all rise in the labor force may reduce the unemployment rate in the endogenous‐growth case. 相似文献