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131.
Double sampling scheme is used when cheap auxiliary variables may be measured to improve the estimation of a finite population parameter. Several estimators for population mean, ratio of means and variance are available, when two dependent samples are drawn. However, there are few proposals for the case of independent samples. In this paper both cases of dependent and independent samples are dealt with. A general approach for estimating a finite population parameter is given, showing that all the proposed estimators are particular cases of the same general class. The minimum variance bound for any estimator in this class is provided (at the first order of approximation). Furthermore, an optimal estimator which reaches this minimum is found. 相似文献
132.
Regression models for survival data are often specified from the hazard function while classical regression analysis of quantitative outcomes focuses on the mean value (possibly after suitable transformations). Methods for regression analysis of mean survival time and the related quantity, the restricted mean survival time, are reviewed and compared to a method based on pseudo-observations. Both Monte Carlo simulations and two real data sets are studied. It is concluded that while existing methods may be superior for analysis of the mean, pseudo-observations seem well suited when the restricted mean is studied. 相似文献
133.
The DEDICOM model is a model to analyze square tables describing asymmetric relationships among n entities. Its importance in the asymmetric multidimensional scaling literature is due to the fact that several authors showed a large class of models to be simply a constrained version of DEDICOM. A typical example is the Generalized GIPSCAL proposed by Kiers & Takane. In this paper we present a new algorithm capable to fit, in the least squares sense, any DEDICOM constrained model. 相似文献
134.
We investigate the properties of several statistical tests for comparing treatment groups with respect to multivariate survival data, based on the marginal analysis approach introduced by Wei, Lin and Weissfeld [Regression Analysis of multivariate incomplete failure time data by modelling marginal distributians, JASA vol. 84 pp. 1065–1073]. We consider two types of directional tests, based on a constrained maximization and on linear combinations of the unconstrained maximizer of the working likelihood function, and the omnibus test arising from the same working likelihood. The directional tests are members of a larger class of tests, from which an asymptotically optimal test can be found. We compare the asymptotic powers of the tests under general contiguous alternatives for a variety of settings, and also consider the choice of the number of survival times to include in the multivariate outcome. We illustrate the results with simulations and with the results from a clinical trial examining recurring opportunistic infections in persons with HIV. 相似文献
135.
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137.
This article presents a teaching concept that lets students of the educational fields acquire counselling qualifications along with their curriculum. The importance of offering this course at the university of Hamburg, where a first test-run is conducted, is discussed. Further, the theoretical background, course contents and structures of the planned addition qualification “educational counselling and psycho-educative coaching” are shown. Finally, the current implementation and its progression is described together with an accompanying survey. 相似文献
138.
Ina?GrauEmail author Hans-Werner?Bierhoff 《Gruppendynamik und Organisationsberatung》2002,33(4):437-450
The influence of the social situation on the physical distance and, as measured by a questionnaire, emotional intimacy between participants was experimentally studied (N = 90) in a cooperative, a competitive, and a neutral social situation. Results indicate that the physical distance was greatest under neutral conditions. The cooperative condition produced the strongest feeling of intimacy. It is argued that the neutral condition is irrelevant to the participants’ behaviour and level of attention to other persons. Further, intimacy can only arise if an interaction is both positive and relevant. The correlation between physical and emotional distance turned out to be relatively small, in accordance with the range usually given for attitudebehaviour correlations. 相似文献
139.
马耀鹏 《江苏大学学报(高教研究版)》2002,(3)
随着学习“三个代表”、实践“三个代表”的深入 ,“三个代表”思想如何进课堂是马克思主义理论课教学面临的现实问题。要讲清理论 ,掌握群众 ,体现“三个代表”思想的创新蕴意 ,必须解决好理论的“权威”与“维权”的矛盾 ;课堂中可能出现的“讲清”与“清讲”的矛盾 ;必须着眼于理论思维 ,全面梳理“三个代表”思想。 相似文献
140.
Tobias?BraunEmail author Jochen?Koch 《Organisationsberatung, Supervision, Coaching》2002,9(2):149-159
Quality Management: History, problems and an integrative modelStarting with a critical examination of the history and the commonly known concepts and systems of Quality Management, the paper discusses a broader understanding of quality in a genuinely managerial perspective. This is shown by generating and applying five basic dimensions of the quality concept. An integrative concept of Quality Management is presented. 相似文献