Statistical Dependence Between Random Effects and the Numbers of Observations on the Effects for the Unbalanced One-Way Random Classification
不平衡单向随机分类中随机效应与观测数量的统计依赖AI 解读 ↓
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不平衡单向随机分类中随机效应与观测数量的统计依赖AI 解读 ↓
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This paper deals with certain aspects of variance component estimation for the unbalanced one-way random classification where the number (Ni ) of observations in the ith class is treated as a random variable not necessarily independent of the class effect (Ai ). It is assumed that in general P(Ni = 0) > 0. The conditional expectations (given the number of observations in each class) of all estimators of the between variance component (σ2 a ) belonging to a certain class of estimators are derived. A general expression is found for the expected value of that estimator of σ2 a yielded by analysis of variance of class means. The limit of this expression (as the number of classes → ∞) is given; and it is shown that, if the bivariate distribution function of Ai , Ni belongs to a certain class of distribution functions, then this limit is less than σ2 a . Numerical approximations to the expected values of two estimators of σ2 a are presented for one subclass of such distribution functions.