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641.
Ashish Das Aloke Dey Ling-Yau Chan Kashinath Chatterjee 《Journal of statistical planning and inference》2008
A popular measure to assess 2-level supersaturated designs is the E(s2) criterion. In this paper, improved lower bounds on E(s2) are obtained. The same improvement has recently been established by Ryan and Bulutoglu [2007. E(s2)-optimal supersaturated designs with good minimax properties. J. Statist. Plann. Inference 137, 2250–2262]. However, our analysis provides more details on precisely when an improvement is possible, which is lacking in Ryan and Bulutoglu [2007. E(s2)-optimal supersaturated designs with good minimax properties. J. Statist. Plann. Inference 137, 2250–2262]. The equivalence of the bounds obtained by Butler et al. [2001. A general method of constructing E(s2)-optimal supersaturated designs. J. Roy. Statist. Soc. B 63, 621–632] (in the cases where their result applies) and those obtained by Bulutoglu and Cheng [2004. Construction of E(s2)-optimal supersaturated designs. Ann. Statist. 32, 1662–1678] is established. We also give two simple methods of constructing E(s2)-optimal designs. 相似文献
642.
邹岳华 《上海理工大学学报(社会科学版)》1989,(3)
本文讨论了减小热敏电阻温度传感器非线性测温误差的方法和参数计算公式。从整机出发,研究了传感器误差和成本费用的优化分配。经过优化设计,提高了传感器整机精度,同时又扩展了测温范围。 相似文献
643.
本文研究玻璃管空气预热器的优化问题,提出了管式空气预热器优化设计的通用计算机软件,并进行了实例计算。同时还对卧式空气预热器的经济流速和最佳风烟速比进行了讨论。 相似文献
644.
AnantM. Kshirsagar Joanna Chung-inCheng 《Australian & New Zealand Journal of Statistics》1996,38(1):83-89
This paper proposes a new measure of rotatability of a response surface design. It is based on a comparison between the design moments of a given design and the design moments of a rotatable design closest to the given design in the least squares sense. This measure is easier to calculate than Khur?s measure. An alternative easier non-geometrical way of deriving Khuri's measure is also presented. Both measures are calculated to illustrate some designs considered by Khuri. 相似文献
645.
el-Guebaly N 《Journal of gambling studies / co-sponsored by the National Council on Problem Gambling and Institute for the Study of Gambling and Commercial Gaming》2005,21(1):41-47
The paper presents a case study of our attempt to design an outcome package for a program including pathological gamblers and their comorbidities. The clinical intricacies involved highlight the limitations of the clinical trial and the need for alternate designs aimed at assessing effectiveness.the critical contributions of Dr. David Hodgins in developing our programs outcome monitoring is hereby gratefully acknowledged. 相似文献
646.
We consider optimal designs for a class of symmetric models for binary data which includes the common probit and logit models. We show that for a large group of optimality criteria which includes the main ones in the literature (e.g. A-, D-, E-, F- and G-optimality) the optimal design for our class of models is a two-point design with support points symmetrically placed about the ED50 but with possibly unequal weighting. We demonstrate how one can further reduce the problem to a one-variable optimization by characterizing various of the common criteria. We also use the results to demonstrate major qualitative differences between the F - and c-optimal designs, two design criteria which have similar motivation. 相似文献
647.
Anthony C. Atkinson & R. Dennis Cook 《Journal of the Royal Statistical Society. Series B, Statistical methodology》1997,59(1):111-124
We investigate D -optimum designs for experiments in which a linear model holds after an unknown power transformation of the univariate response variable. This is a departure from standard D -optimal design in which an appropriate scale for the response is assumed known before data collection. The design problem that we formulate is intrinsically non-linear, requiring characterization of likely parameter values. Several applications are presented to illustrate the importance of recognizing the role of response transformations at the design stage. 相似文献
648.
宣培才 《绍兴文理学院学报》1991,(Z1)
本文主要涉及以下两方面的内容:(1)给出一类多元指数型算子的构造方法;(2)在一致逼近意义下,给出了多元指数型算子的饱和理论及逼近的等价定理,主要结果如下: A.设L_(n,m)(f;x,y,)表示二元指数型算子,则当f∈C_B(D),且满足αf/αx,αf/αy∈A,C,Loc,‖ψ~2×α~2f/αx~2‖,‖ψ~2×α~2f/αxαy‖,‖ψ~2×α~ 相似文献
649.
This is the first of two papers that provide an expository discussion of the basic structure of the asymptotic theory of M-estimators in dynamic nonlinear models and a revlew of the literature. In this paper we discuss consistency,uniform laws of large numbers and develop a new framework for laws of large numbers for dependent and heterogeneous processes, encompassing the theory of stochastically stable as well as near epoch dependent processes. This framework results in simplified catalogues of sufficient conditions for consistency. The second paper, Potscher and Prucha (1990b), deals with asymptotic distribution theory. 相似文献
650.
Equally spaced designs are compared using the generalized variance as a measure of efficiency. Results for polynomial models are derived on the increased efficiency arising from increasing the number of design points when the regions are fixed and when the regions are expanded. The effects of dependence among the observations on these results are studied by considering a particular family of stationary correlated error structures. 相似文献