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911.
A Sampling experiment performed using data collected for a large clinical trial shows that the discriminant function estimates of the logistic regression coefficients for discrete variables may be severely biased. The simulations show that the mixed variable location model coefficient estimates have bias which is of the same magnitude as the bias in the coefficient estimates obtained using conditional maximum likelihood estimates but require about one-tenth of the computer time. 相似文献
912.
In many applications, decisions are made on the basis of function of parameters g(θ). When the value of g(theta;) is calculated using estimated values for te parameters, its is important to have a measure of the uncertainty associated with that value of g(theta;). Likelihood ratio approaches to finding likelihood intervals for functions of parameters have been shown to be more reliable, in terms of coverage probability, than the linearization approach. Two approaches to the generalization of the profiling algorithm have been proposed in the literature to enable construction of likelihood intervals for a function of parameters (Chen and Jennrich, 1996; Bates and Watts, 1988). In this paper we show the equivalence of these two methods. We also provide and analysis of cases in which neither profiling algorithm is appropriate. For one of these cases an alternate approach is suggested Whereas generalized profiling is based on maximizing the likelihood function given a constraint on the value of g(θ), the alternative algorithm is based on optimizing g(θ) given a constraint on the value of the likelihood function. 相似文献
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915.
The growing popular realization that American product quality and productivity are no longer without challenge for world leadership presents an opportunity for the American statistical community to make stronger contributions to sound industrial practice than it has in the past. Management consultants, such as Deming and Juran, are promoting philosophies that contain strong statistical components and are being heard by top U.S. executives. There are thus growing opportunities for industrial statisticians. Upon reviewing the content of typical graduate-level statistical quality control courses and books in the light of the present situation, we find them to be inadequate and in some cases to suffer from inappropriate emphases. In this article we discuss our perceptions of what is needed in the way of a new graduate-level course in statistics for quality and productivity (SQP). We further offer for discussion a syllabus for such a course (which is a modification of one used at Iowa State in the 1983 spring semester), some comments on how specific topics might be approached, and also a partially annotated list of references for material that we believe belongs in a modern SQP course. 相似文献
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917.
David R Fritsch 《Serials Review》2013,39(4):271-272
AbstractOpen Access is increasingly considered the most logical and hopeful solution to ease the burden on library budgets, as well as the best way to unshackle research findings—its primary role. But is Open Access the panacea for all the ills that currently beset those of us dedicated to the dissemination and preservation of good quality academic research? In this article, Richard Gedye (Sales Director, Oxford Journals) explores the background to one of Oxford Journals' current Open Access initiatives and explains some elements of the model adopted. He also offers his personal opinions on the significant role librarians could play in the Open Access story. 相似文献
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In many applications in applied statistics, researchers reduce the complexity of a data set by combining a group of variables into a single measure using a factor analysis or an index number. We argue that such compression loses information if the data actually have high dimensionality. We advocate the use of a non-parametric estimator, commonly used in physics (the Takens estimator), to estimate the correlation dimension of the data prior to compression. The advantage of this approach over traditional linear data compression approaches is that the data do not have to be linearised. Applying our ideas to the United Nations Human Development Index, we find that the four variables that are used in its construction have dimension 3 and the index loses information. 相似文献
920.
David Gullette Dorothy Rosenberg 《Development policy review : the journal of the Overseas Development Institute》2015,33(6):703-723
Reflecting on the experience of conducting a conflict‐sensitivity review during the 2010 political and social disturbances in Kyrgyzstan, the authors argue for the integration of conflict‐sensitive methods across programme areas, close monitoring of conflict potential and an institutional commitment to detailed conflict research drawing on broader socio‐economic research. Comparing their observations with the review findings of conflict sensitivity methods in Nepal, the authors offer recommendations for the application of ‘do no harm’ principles to development work in fragile environments. Ensuring the creation and systematic use of an adequate knowledge base is the critical first step to preventing the lessons that should be learnt from the Kyrgyz experience from being lost. 相似文献