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The effects of changes in the minimum drinking ages in various North American jurisdictions are reviewed. The research suggests that although most teenagers have experimented with alcohol, the rates of alcohol consumption and alcohol-related traffic collisions can be increased and decreased with the drinking age control legislation. 相似文献
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The application of infrared chemical imaging to the analysis of bicomponent fibers was evaluated. Eleven nominally bicomponent fibers were examined either side-on or in cross-section. In six of the 11 samples, infrared chemical imaging was able to spatially resolve two spectroscopically distinct regions when the fibers were examined side-on. As well as yielding characteristic infrared spectra of each component, the technique also provided images that clearly illustrated the side-by-side configuration of these components in the fiber. In one case it was possible to prepare and image a cross-section of the fiber, but in general the preparation of fiber cross-sections proved very difficult. In five of the 11 samples, the infrared spectra could be used to identify the overall chemical composition of the fibers, according to a published classification scheme, but the fiber components could not be spatially resolved. Difficulties that are inherent to conventional "single-point" infrared spectroscopy, such as interference fringing and sloping baselines, particularly when analyzing acrylic type fibers, were also encountered in the infrared chemical image analysis of bicomponent fibers. A number of infrared sampling techniques were investigated to overcome these problems, and recommendations for the best sampling technique are given. Chemical imaging results were compared with those obtained using conventional fiber microscopy techniques. 相似文献
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The relative importance of procedural and distributive factors for satisfaction was tested in a field study of 71 couples who were randomly assigned to mediate or litigate their child custody dispute. Multiple regression analyses showed that procedural factors (decision control and respect) and distributive factors (feeling of winning what one wanted) were equally influential for parents' satisfaction as a group. However, the relative importance of procedural fairness and outcome favorability differed depending on disputant gender, favorability of outcomes, and level of conflict in the relationship. Support was found for Tyler's (1989) assertion that the specific procedural factor of decision control is especially important in dispute resolution settings. However, contrary to expectation, decision control was relatively more important to satisfaction in mediation than in litigation. It is suggested that the type of allocation setting may not be as influential for satisfaction as participants' status in the proceedings and their perceptions of the level of conflict. 相似文献
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EDA for HLM: Visualization when Probabilistic Inference Fails 总被引:1,自引:1,他引:0
e-mail: jwbowers{at}umich.edu (corresponding author) e-mail: kwdrake{at}umich.edu Nearly all hierarchical linear models presented to politicalscience audiences are estimated using maximum likelihood undera repeated sampling interpretation of the results of hypothesistests. Maximum likelihood estimators have excellent asymptoticproperties but less than ideal small sample properties. Multilevelmodels common in political science have relatively large samplesof units like individuals nested within relatively small samplesof units like countries. Often these level-2 samples will beso small as to make inference about level-2 effects uninterpretablein the likelihood framework from which they were estimated.When analysts do not have enough data to make a compelling argumentfor repeated sampling based probabilistic inference, we showhow visualization can be a useful way of allowing scientificprogress to continue despite lack of fit between research designand asymptotic properties of maximum likelihood estimators. 相似文献
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Ellena KR 《Journal of law and medicine》2005,13(1):106-124
The introduction of a treaty between Australia and New Zealand to regulate complementary and alternative medicines (CAM) has revived the age-old debate between advocates of conventional medicine and those of CAM, particularly with regard to the standards of regulation that should be applied. Currently, the systems for regulating CAM products in Australia and New Zealand are very different, making harmonisation contentious, as the proposed treaty follows the Australian system very closely. New Zealand and Australian principles of good regulatory practice stipulate that only minimum necessary standards should be imposed, and should be transparent, understandable and equitable. It is argued that the proposed treaty does not adhere to good regulatory standards, and that other forms of harmonisation should be sought to avoid adopting a regulatory regime in New Zealand that is overly restrictive and harmful to the New Zealand CAM industry. 相似文献