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41.
Stelios D. Georgiou 《Metrika》2008,68(2):189-198
Supersaturated designs are an important class of factorial designs in which the number of factors is larger than the number
of runs. These designs supply an economical method to perform and analyze industrial experiments. In this paper, we consider
generalized Legendre pairs and their corresponding matrices to construct E(s
2)-optimal two-level supersaturated designs suitable for screening experiments. Also, we provide some general theorems which
supply several infinite families of E(s
2)-optimal two-level supersaturated designs of various sizes.
相似文献
42.
Nancy Flournoy Caterina May Piercesare Secchi 《Revue internationale de statistique》2012,80(2):293-305
Response‐adaptive designs are being used increasingly in applications, and this is especially so in early phase clinical trials. This paper reviews a particular class of response‐adaptive designs that have the property of picking the superior treatment with probability tending to one. This is a desirable property from an ethical point of view in clinical trials. The model underlying such designs is a randomly reinforced urn. This paper provides an overview of results for these designs, starting from the early paper of Durham and Yu (1990) until the recent work by Flournoy, May, Moler and Plo (2010). 相似文献
43.
文章论述了现有抗震规范抗震设计方法存在的问题,并对2008年规范的修改内容进行了详细说明,给出了概念设计的要领和做好概念设计的建议。 相似文献
44.
变电站基础设计是变电站施工设计优化的重点。文章针对变电站建筑物的不同特点,介绍了几种对变电站不良地基进行处理的方法。 相似文献
45.
This paper examines nested 2 ×2 row-column designs when within-block observations are assumed to be dependent. The model
considered has fixed block effects, which may also include row and/or column effects. Optimal binary and non-binary designs,
constructed from semi-balanced arrays, are given under both generalised and ordinary least squares estimation. It is shown
that binary designs are optimal when dependence is low. In general, however, the optimal designs are highly specific to the
correlation values.
Received: October 1999 相似文献
46.
A note on generalized aberration in factorial designs 总被引:2,自引:0,他引:2
In this paper we extend the wordlength pattern and minimum aberration for non-regular factorials. The new concepts, the generalized
wordlength pattern and minimum generalized aberration, are proposed. Some connections between the generalized wordlength pattern
and uniformity are given. Some applications of the new concepts in the Blackett and Burman's designs are discussed.
Received: September 2000 相似文献
47.
文章介绍了35kV长档柜线路的设计计算过程及要求,为线路工程设计提供有益借鉴。 相似文献
48.
Two ge neral classes of search designs for factor screening experiments with factors at three levels
In this paper, we are presenting general classes of factor screening designs for identifying a few important factors from
a list of m (≥ 3) factors each at three levels. A design is a subset of 3m possible runs. The problem of finding designs with small number of runs is considered here. A main effect plan requires at
least (2m + 1) runs for estimating the general mean, linear and quadratic effects of m factors. An orthogonal main effect plan requires, in addition, the number of runs as a multiple of 9. For example, when m=5, a main effect plan requires at least 11 runs and an orthogonal main effect plan requires 18 runs. Two general factor screening
designs presented here are nonorthogonal designs with (2m− 1) runs. These designs, called search designs permit us to search for and identify at most two important factors out of
m factors under the search linear model introduced in Srivastava (1975). For example, when m=5, the two new plans given in this paper have 9 runs, which is a significant improvement over an orthogonal main effect plan
with 18 runs in terms of the number of runs and an improvement over a main effect plan with at least 11 runs. We compare these
designs, for 4≤m≤ 10, using arithmetic and geometric means of the determinants, traces, and maximum characteristic roots of certain matrices.
Two designs D1 and D2 are identical for m=3 and this design is an optimal design in the class of all search designs under the six criteria discussed above. Designs D1 and D2 are also identical for m=4 under some row and column permutations. Consequently, D1 and D2 are equally good for searching and identifying one important factor out of m factors when m=4. The design D1 is marginally better than the design D2 for searching and identifying one important factor out of m factors when m=5, … , 10. The design D1 is marginally better than the D2 for searching and identifying two important factors out of m factors when m=5, 7, 9. The design D2 is somewhat better than the design D1 for m=6, 8. For m=10, D1 is marginally better than D2 w.r.t. the geometric mean and D2 is marginally better than D1 w.r.t. the arithmetic mean of the maximum characteristic roots. 相似文献
49.
Henk J. de Vries Joost P.M. de Ruijter Najim Argam 《Technology Analysis & Strategic Management》2013,25(3):249-262
Literature suggests that in battles between competing designs, ultimately one design will emerge as dominant to the detriment of the others. Various factors and forces have been identified to explain this phenomenon. Yet, sometimes no dominant design emerges at all and multiple competing designs coexist in the market. The flash memory card industry provides an example of this. In this study, we use this example as a case to investigate the circumstances under which an industry has a tendency toward multiple designs. The case shows that a combination of factors may result in multiple designs and we argue that such a combination of factors will increasingly also apply in other cases. 相似文献
50.
André I. Khuri 《Revue internationale de statistique》2000,68(3):311-322
This article provides (1) a comprehensive coverage of the literature on designs for estimating variance components, and (2) a review of recent applications of such designs in genetics, statistical process control, and quality improvement. In addition, recent methods of estimation of variance components and model forms, other than the linear, are discussed. The latter developments have a direct effect on the choice of design. Some suggested ideas for future research directions are also given. 相似文献