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51.
Rhodes JE 《New directions for youth development》2004,(101):145-161
After-school settings are interpersonal in nature, and the quality of the relationships that are forged can directly influence youths' attendance decisions and the developmental benefits they derive. Programs should more effectively capitalize on this potential for caring adult-staff relationships. 相似文献
52.
Jean Ruffat 《Long Range Planning》1983,16(2):74-84
The author has developed a strategic framework for the management of ‘non-market corporations’ which he thinks better meets their peculiarities and specific needs by framing them in a relatively tight and rigorous socio-economic system relating to their internal logic. He believes that the proposed approach should provide the basis for a more constructive relationship between such corporations and the community at large and for better levels of performance 相似文献
53.
54.
The economically optimal sample size in a food safety test balances the marginal costs and marginal benefits of increasing the sample size. We provide a method for selecting the sample size when testing beef trim for Escherichia coli O157:H7 that equates the averted costs of recalls and health damages from contaminated meats sold to consumers with the increased costs of testing while allowing for uncertainty about the underlying prevalence rates of contamination. Using simulations, we show that, in most cases, the optimal sample size is larger than the current sample size of 60 and, in some cases, it exceeds 120. Moreover, lots with a lower prevalence rate have a higher expected damage because contamination is more difficult to detect. Our simulations indicate that these lots have a higher optimal sampling rate. 相似文献
55.
56.
We derive a non-parametric test for testing the presence of V(Xi ,εi ) in the non-parametric first-order autoregressive model Xi+1 =T(Xi )+V(Xi ,εi )+U(Xi )εi+1 , where the function T(x) is assumed known. The test is constructed as a functional of a basic process for which we establish a weak invariance principle, under the null hypothesis and under stationarity and mixing assumptions. Bounds for the local and non-local powers are provided under a condition which ensures that the power tends to one as the sample size tends to infinity.The testing procedure can be applied, e.g. to bilinear models, ARCH models, EXPAR models and to some other uncommon models. Our results confirm the robustness of the test constructed in Ngatchou Wandji (1995) and in Diebolt & Ngatchou Wandji (1995). 相似文献
57.
Massé Raymond Poulin Carole Dassa Clément Lambert Jean Bélair Sylvie Battaglini Alex 《Social indicators research》1998,45(1-3):475-504
Social Indicators Research - This paper addresses the question of whether psychological distress and subjective well-being are the opposite poles of the same axis of mental health or independent... 相似文献
58.
Fabien Gagnon Mathieu Courchesne Benoît Lévesque Pierre Ayotte Jean‐Marc Leclerc Jean‐Claude Belles‐Isles Claude Prévost Jean‐Claude Dessau 《Risk analysis》2008,28(5):1221-1230
The present study was aimed at assessing the health consequences of the presence of radon in Quebec homes and the possible impact of various screening programs on lung cancer mortality. Lung cancer risk due to this radioactive gas was estimated according to the cancer risk model developed by the Sixth Committee on Biological Effects of Ionizing Radiations. Objective data on residential radon exposure, population mobility, and tobacco use in the study population were integrated into a Monte‐Carlo‐type model. Participation rates to radon screening programs were estimated from published data. According to the model used, approximately 10% of deaths due to lung cancer are attributable to residential radon exposure on a yearly basis in Quebec. In the long term, the promotion of a universal screening program would prevent less than one death/year on a province‐wide scale (0.8 case; IC 99%: –3.6 to 5.2 cases/year), for an overall reduction of 0.19% in radon‐related mortality. Reductions in mortality due to radon by (1) the implementation of a targeted screening program in the region with the highest concentrations, (2) the promotion of screening on a local basis with financial support, or (3) the realization of systematic investigations in primary and secondary schools would increase to 1%, 14%, and 16.4%, respectively, in the each of the populations targeted by these scenarios. Other than the battle against tobacco use, radon screening in public buildings thus currently appears as the most promising screening policy for reducing radon‐related lung cancer. 相似文献
59.
Consider a firm as an organization that needs to efficiently coordinate several specialized departments in an uncertain environment.
Decision making involves collective planning sessions and decentralized operational processes. In this setting this paper
explores the role of economic modeling through an experimental game. Results support the idea that economic modeling favors
higher performance. Economic modeling facilitates the emergence of common knowledge and the decomposition of a group decision
problem into individual decision problems that are meaningfully interrelated.
This paper was presented at the Porquerolles Summer School on Cognitive Sciences, September 2001. 相似文献
60.