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161.
162.
Newspapers, Television and Political Reasoning 总被引:2,自引:0,他引:2
Adults' use of newspapers is found to correlate positively withhaving reasons for preferring one U.S. senatorial candidateover another. Television exposure is negatively related to politicalreasoning to a nearly significant degree. Data were providedby a 1974 nationwide, postelection survey. Analysis was conductedat the aggregate level, examining media behavior and politicalknowledge in 67 news markets. News markets with competitionamong daily newspapers show greater levels of information thanmonopoly areas, controlling for education and interest in politics.Results suggest that a decline in newspaper penetration, lessenedcompetition, or shift toward use of television for news wouldweaken peoples' understanding about partisan candidates. 相似文献
163.
Summary A small scale pilot study was conducted in two area teams andfour part-time GP attachment schemes to test the use of a psychiatricscreening instrument (GHQ28) and social assessments. The instrumentswere administered at case allocation and again at three months.Few clinical and social changes were observed in the short term.It was found that 27 out of 40 cases (68%) were identified bythe psychiatric screening instruments as probable cases of minordisorder, on both occasions, and that a further seven clientscould have had a transient disturbance. On the basis of theseresults it was felt that a larger two-stage enquiry was warranted,and necessary, before definite conclusions could be drawn. 相似文献
164.
This paper explores how some widely studied classes of nonexpected utility models could be used in dynamic choice situations. A new "sequential consistency" condition is introduced for single-stage and multi-stage decision problems. Sequential consistency requires that if a decision maker has committed to a family of models (e.g., the multiple priors family, the rank-dependent family, or the betweenness family) then he use the same family throughout. Conditions are presented under which dynamic consistency, consequentialism, and sequential consistency can be simultaneously preserved for a nonexpected utility maximizer. An important class of applications concerns cases where the exact sequence of decisions and events, and thus the dynamic structure of the decision problem, is relevant to the decision maker. It is shown that for the multiple priors model, dynamic consistency, consequentialism, and sequential consistency can all be preserved. The result removes the argument that nonexpected utility models cannot be consistently used in dynamic choice situations. Rank-dependent and betweenness models can only be used in a restrictive manner, where deviation from expected utility is allowed in at most one stage. 相似文献
165.
Summary A study is reported of the perceived effectiveness of teamsof social workers and their managers. Prior studies are reviewedand shown to give disproportionate emphasis to the supervisionelement in the manager's task. It is shown that in the sampleof teams studied the correlates of perceived team effectivenesswere quite different in area teams from those found in socialwork teams. Social work teams required a manager who was primarilysupportive, whereas in area teams the manager's role was foundto be less important than were group process variables. 相似文献
166.
JÜRG SCHELLDORFER PETER BÜHLMANN SARA VAN DE GEER 《Scandinavian Journal of Statistics》2011,38(2):197-214
Abstract. We propose an ?1‐penalized estimation procedure for high‐dimensional linear mixed‐effects models. The models are useful whenever there is a grouping structure among high‐dimensional observations, that is, for clustered data. We prove a consistency and an oracle optimality result and we develop an algorithm with provable numerical convergence. Furthermore, we demonstrate the performance of the method on simulated and a real high‐dimensional data set. 相似文献
167.
Rubbery Polya Tree 总被引:1,自引:0,他引:1
Abstract. Polya trees (PT) are random probability measures which can assign probability 1 to the set of continuous distributions for certain specifications of the hyperparameters. This feature distinguishes the PT from the popular Dirichlet process (DP) model which assigns probability 1 to the set of discrete distributions. However, the PT is not nearly as widely used as the DP prior. Probably the main reason is an awkward dependence of posterior inference on the choice of the partitioning subsets in the definition of the PT. We propose a generalization of the PT prior that mitigates this undesirable dependence on the partition structure, by allowing the branching probabilities to be dependent within the same level. The proposed new process is not a PT anymore. However, it is still a tail‐free process and many of the prior properties remain the same as those for the PT. 相似文献
168.
Abstract. In a range of imaging problems, particularly those where the images are of man-made objects, edges join at points which comprise three or more distinct boundaries between textures. In such cases the set of edges in the plane forms what a mathematician would call a planar graph. Smooth edges in the graph meet one another at junctions, called 'vertices', the 'degrees' of which denote the respective numbers of edges that join there. Conventional image reconstruction methods do not always draw clear distinctions among different degrees of junction, however. In such cases the algorithm is, in a sense, too locally adaptive; it inserts junctions without checking more globally to determine whether another configuration might be more suitable. In this paper we suggest an alternative approach to edge reconstruction, which combines a junction classification step with an edge-tracking routine. The algorithm still makes its decisions locally, so that the method retains an adaptive character. However, the fact that it focuses specifically on estimating the degree of a junction means that it is relatively unlikely to insert multiple low-degree junctions when evidence in the data supports the existence of a single high-degree junction. Numerical and theoretical properties of the method are explored, and theoretical optimality is discussed. The technique is based on local least-squares, or local likelihood in the case of Gaussian data. This feature, and the fact that the algorithm takes a tracking approach which does not require analysis of the full spatial data set, mean that it is relatively simple to implement. 相似文献
169.
PETER J. KOLESAR 《Production and Operations Management》1995,4(3):195-200
A serious gap is emerging between what is espoused as total quality management and what is actually being implemented. Examples of actual implementation failures are given. In addition to affecting the offending firms, these gaps threaten the viability of the quality management movement in the United States. Their causes and appropriate counter measures are worthy topics for research. 相似文献