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Jürgen Groß 《Statistical Papers》2004,45(3):311-336
Linear models with possibly singular dispersion (variance-covariance) matrix of the vector of disturbances have been considered
in the literature since the late sixties. In this paper we give a survey of important results and consequences without a claim
to completeness. Proofs are given for the results in Sections 2 to 5.
相似文献
1 | Notation |
2 | The General Gauss-Markov Model |
3 | Best Linear Unbiased Estimation |
4 | Quadratic Unbiased Estimation |
5 | Testing a Linear Hypothesis |
6 | Further Aspects of Linear Estimation |
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Olman and Shmundak proved 1985 that in estimating a bounded normal mean under squared error loss the Bayes estimator with
respect to the uniform distribution on the parameter interval is gamma-minimax when the parameter interval is sufficiently
small and the class of priors consists of all symmetric and unimodal distributions. Recently, one of the authors showed that
this result remains valid for quite general families of distributions which satisfy some regularity conditions. In the present
paper a generalization to the class of unimodal priors with fixed mode is derived. It is proved that the Bayes estimator with
respect to a suitable mixture of two uniform distributions is gamma-minimax for sufficiently small parameter intervals. To
that end appropriate characterizations of a saddle point in the corresponding statistical games are established. Some results
of a numerical study are presented. 相似文献
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The paper presents research findings on decision making and differences in skill perception between 55 dyads of German managers of large organizations. These findings are related to research on carefully matched samples in the U.S. and U.K. The data, while still confined to two variables (two vertical and one horizontal method of measuring power sharing, and two ways of measuring perceptual differences between closely related decision makers), confirm the validity of a contingency model of managerial decision making and power sharing. 相似文献
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A new modeling approach called ‘recursive segmentation’ is proposed to support the supervised exploration and identification of subgroups or clusters. It is based on the frameworks of recursive partitioning and the Patient Rule Induction Method (PRIM). Through combining these methods, recursive segmentation aims to exploit their respective strengths while reducing their weaknesses. Consequently, recursive segmentation can be applied in a very general way, that is in any (multivariate) regression, classification or survival (time-to-event) problem, using conditional inference, evolutionary learning or the CART algorithm, with predictor variables of any scale and with missing values. Furthermore, results of a synthetic example and a benchmark application study that comprises 26 data sets suggest that recursive segmentation achieves a competitive prediction accuracy and provides more accurate definitions of subgroups by models of less complexity as compared to recursive partitioning and PRIM. An application to the German Breast Cancer Study Group data demonstrates the improved interpretability and reliability of results produced by the new approach. The method is made publicly available through the R-package rseg (http://rseg.r-forge.r-project.org/). 相似文献