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1. Introduction and Main ResultsSuppose the population of interest consists of N distinct units labelled by 1,' f N.Associated with unit i are two values K and Xi, with Xi > 0 (i = 1,' t N). Denote thepopulation means of K and X, by Y and X respectively. To estimate Y, it is customaryto select a simple raPdom sample of size n and to use the ratio estimatNn = RX if Xis available, where R = y/x is an estimator for population ratio R = Y/X, y and x arerespectively the 8ample mean8 of… 相似文献
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考察F-分布的密度和矩,本文给出了正态随机向量二次型之比服从F-分布的充分必要条件,进而给出了椭球等高随机向量二次型之比服从F分布的充分必要条件.作为应用,我们减弱了传统F-检验中对两简单子样独立性的要求. 相似文献
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