An Empirical Study of Stabilities of Estimators and Variance Estimators in Unequal Probability Sampling (n = 3 or 4)
不等概率抽样中估计量与方差估计量稳定性的经验研究:样本量为三或四AI 解读 ↓
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Rao and Bayless [18] empirically investigated the stabilities of estimators of the population total and stabilities of their variance estimators for several methods of unequal probability sampling of two units (n =2) per stratum. In this article, after deriving the variances of variance estimators for general n for the following methods: (a) the I.P.P.S. (inclusion probabilities proportional to size) methods of Fellegi, Sampford and Carroll-Hartley, (b) Des Raj's and Murthy's methods, (c) the Rao-Hartley-Cochran method, (d) Lahiri's method using a ratio estimator and (e) p.p.s. sampling with replacement using the customary estimator, we perform empirical studies for n = 3 and 4 along the lines of our previous article. A major conclusion is that Murthy's method may be preferable over the other methods when a stable estimator as well as a stable variance estimator are required.