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41.
It is shown that the minimal covering designs for v=6t+5 treatments in blocks of size 3 are optimal w.r.t. a large class of optimality criteria. This class of optimality criteria includes the well-known criteria of A-, D- and E-optimality. It is conjectured that these designs are also optimal w.r.t. other criteria suggested by Takeuchi (1961). 相似文献
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Roy Boyd 《Journal of Policy Modeling》1983,5(2):293-307
This article quantitatively analyzes the various impacts of current U.S. coastal restrictions on the Northwest lumber industry. The history of U.S. maritime regulation is briefly reviewed and a simulation model is developed to measure its affect on lumber shipments and transport costs. The results of the model indicate that aggregate cost redutions obtained through deregulation are likely to be small. The pattern of intercoastal shipments could change a great deal, however, with U.S. producers picking up a large share of the Northeast market. 相似文献
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Lee Roy Beach Alexandra Hope Brenda D. Townes Frederick L. Campbell 《Population and environment》1982,5(2):95-108
It is proposed that as expectations about parenting become increasingly high, couples have an increasing tendency to decide to have a(or another) child. Similarly, as parenting expectations become increasingly low, couples have an increasing tendency to decide on sterilization. Couples without extremely high or low expectations continue to use contraceptives. Expectations are defined as Subjective Expected Utilities (SEUs) for having or not having a child. Preliminary results support the model and suggest that the threshold for making these decisions is not at neutral, but is conservative so that couples must have fairly high or low expectations before making such binding decisions are parenting or sterilization. The fact that data reveal that this exists supports the Expectancy-Threshold model, but it also requires a change in SEU Theory's maximization rule for some kinds of decisions.The authors wish to thank Carole Baker, former executive Director of the National Alliance for Optional Parenthood, and the board members of that organization for their cooperation, and Dr. Barbara Beach who helped with the data analysis. Funding was provided, in part, by The Center for Studies in Demography and Ecology, University of Washington, through a grant, No. 5 P30 HDO 9397, from the National Institute for Child Health and Human Development 相似文献
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Bruno Roy 《Journal of popular culture》1980,14(1):60-69
Each of us has wished at some time to send in three box tops andget a magic kit that contains itchingpowder to give to our enemies, instructions for tricks designed to baffle our friends, and potions to make us more desirable. Exactly so in the Middle Ages. Bruno Roy's delightful essay on medieval do-it-yourself magic reveals the strong popular interest in practical jokes, illusions and tricks. People in the Middle Ages were playful and high-spirited, waiting to entertain and be entertained. The transformative power implicit i n the tricks played by jugglers or entertainers appealed to all classes of society; these same jugglers not only dealt in illusory tricks but often used various chemicalpreparations, giving a “scientific” cast to their pranks. That so many of these tricks were related to the household in terms of the joke itself or the ingredients used suggests the widespread popularity of magic kits, a popularity that today perhaps resides only with the children who save the box tops. 相似文献
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In this study, the robustness of power and significance level of several statistical testing methods was evaluated under the assumption that the test populations were from Poisson, negative binomial, or geometric distributions. The F-ratio test, with or without appropriate transformations, was shown to be both safe and robust for all distributions examined. 相似文献
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