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无偏比率型估计量的精度AI 解读

When each unit in a population of N units consists of an x and a y measurement, where the population mean [Xbar] of the x's is known, then the population mean [Ybar] of the y's is frequently estimated by drawing a random sample of n units and using one of the customary biased ratio-type estimators, [Ybar] (based on the ratio of the y sample mean and the x sample mean), or [Ybar] (based on the sample mean of the ratios of the y and x measurements for each unit). The precision…

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交叉分类的关联度量AI 解读

When populations are cross-classified with respect to two or more classifications or polytomies, questions often arise about the degree of association existing between the several polytomies. Most of the traditional measures or indices of association are based upon the standard chi-square statistic or on an assumption of underlying joint normality. In this paper a number of alternative measures are considered, almost all based upon a probabilistic model for activity to which…