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111.
Michael Haber 《统计学通讯:模拟与计算》2013,42(4):999-1013
In 1935, R.A. Fisher published his well-known “exact” test for 2x2 contingency tables. This test is based on the conditional distribution of a cell entry when the rows and columns marginal totals are held fixed. Tocher (1950) and Lehmann (1959) showed that Fisher s test, when supplemented by randomization, is uniformly most powerful among all the unbiased tests UMPU). However, since all the practical tests for 2x2 tables are nonrandomized - and therefore biased the UMPU test is not necessarily more powerful than other tests of the same or lower size. Inthis work, the two-sided Fisher exact test and the UMPU test are compared with six nonrandomized unconditional exact tests with respect to their power. In both the two-binomial and double dichotomy models, the UMPU test is often less powerful than some of the unconditional tests of the same (or even lower) size. Thus, the assertion that the Tocher-Lehmann modification of Fisher's conditional test is the optimal test for 2x2 tables is unjustified. 相似文献
112.
近年来周王权力问题颇受学界关注,大量成果问世。本文旨在回顾东周时期周王权力的情况,简评这一问题的研究现状,并提出对此问题的一些思考。 相似文献
113.
The following personal reflections are in honour of Michael and all that he contributed to our lives. And, we honour Brigitte a key member of the group who died in 2006. Mem, Sue and Veronica, December 2008. 相似文献
114.
Michael R. Greenberg 《Risk analysis》2009,29(9):1242-1254
Public and political opposition have made finding locations for new nuclear power plants, waste management, and nuclear research and development facilities a challenge for the U.S. government and the nuclear industry. U.S. government-owned properties that already have nuclear-related activities and commercial nuclear power generating stations are logical locations. Several studies and utility applications to the Nuclear Regulatory Commission suggest that concentrating locations at major plants (CLAMP) has become an implicit siting policy. We surveyed 2,101 people who lived within 50 miles of 11 existing major nuclear sites and 600 who lived elsewhere in the United States. Thirty-four percent favored CLAMP for new nuclear power plants, 52% for waste management facilities, and 50% for new nuclear laboratories. College educated, relatively affluent male whites were the strongest CLAMP supporters. They disproportionately trusted those responsible for the facilities and were not worried about existing nuclear facilities or other local environmental issues. Notably, they were concerned about continuing coal use. Not surprisingly, CLAMP proponents tended to be familiar with their existing local nuclear site. In short, likely CLAMP sites have a large and politically powerful core group to support a CLAMP policy. The challenge to proponents of nuclear technologies will be to sustain this support and expand the base among those who clearly are less connected and receptive to new nearby sites. 相似文献
115.
The purpose of the article is, in case of one sample, to obtain tests concerning the parameter in the power series distribution in one parameter using Ku11back-Leibier information measure. The class of power series distibutions contains a host of discrete distributions. Ve illustrate the general results obtained in case of the geometric distibution. 相似文献
116.
It is shown that the locally best invariant test for the existence of outliers for scale parameters of the gamma distribution is given by Bartholomew's test for exponentiality which is the ratio of the sum of squares of the data to the square of the sample mean. The optimality robustness, including null and nonnull robustness of the test is shown. A small simulation study to compare the power among the other eight competitive tests for testing exponentiality is performed. It is seen that the locally best invariant test is not always best but is reasonably good. It is slightly better than Cochran's test and suffers less from the limiting masking effect. 相似文献
117.
新经济政策实行后,苏维埃政权对由此出现的"耐普曼"持反对态度,在认识上视它为资本主义经济成分,在政策和实践中则以限制和打击为主。这也决定了"耐普曼"最终消亡的命运。 相似文献
118.
本文从地缘政治视角分析美国崛起的原因,比照当代中国与19世纪末美国在地缘政治环境上的异同,提出当代中国和平发展应研究借鉴美国的经验,按照统一国家——增强国力——发展海权的步骤,把握中国自身地缘政治环境特点,顺应当代世界发展潮流,统筹好国内国际两个大局,为实现中华民族的伟大复兴奠定坚实基础、创造良好环境。 相似文献
119.
“政教合一制”是一种特有的政治制度,然而在对这一制度的判断标准上学界却有不同的意见,文章通过西藏地方和中世纪西欧“政教合一制”形成的比较,提出作者自己的判断标准。 相似文献
120.