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按规模比例概率随机化系统抽样中的方差估计AI 解读

Approximate expressions are given for the variance of two commonly used variance estimators when two units are selected from a stratum systematically with probability proportionate to size. The stability of the variance estimators is examined with the help of an example.

按规模成比例的随机系统抽样中的方差估计AI 解读

Approximate expressions are given for the variance of two commonly used variance estimators when two units are selected from a stratum systematically with probability proportionate to size. The stability of the variance estimators is examined with the help of an example.

大规模调查中按规模成比例的系统抽样AI 解读

Based on a nationwide labour force survey the gain in precision arising from systematic pps (probability proportionate to size) sampling of the primary sampling units as compared to with-replacement pps sampling is obtained. The performance of a particular convenient but biased estimator of sampling variance is also studied.

大规模调查中按规模成比例的系统抽样AI 解读

Based on a nationwide labour force survey the gain in precision arising from systematic pps (probability proportionate to size) sampling of the primary sampling units as compared to with-replacement pps sampling is obtained. The performance of a particular convenient but biased estimator of sampling variance is also studied.

若干抽样技术的相对精度AI 解读

The problem considered is estimation of the mean value of a character for a finite population, making use of information on an auxiliary character. A comparison is made between the pps estimate and the simple average, ratio and regression and stratified sample estimates. The results are obtained under the assumption that the finite population is a random sample from an infinite population possessing certain properties.

若干抽样技术的相对精度AI 解读

The problem considered is estimation of the mean value of a character for a finite population, making use of information on an auxiliary character. A comparison is made between the pps estimate and the simple average, ratio and regression and stratified sample estimates. The results are obtained under the assumption that the finite population is a random sample from an infinite population possessing certain properties.

不等概率不放回抽样中的若干估计量AI 解读

The problem considered is estimation of the total value of a character for a finite population from a sample when the units are selected with varying probabilities without replacement. Several unbiased estimators are proposed. Exact expressions and unbiased estimators for the variances of the estimators are obtained. Certain properties of Yates and Grundy's estimator of variance are proved. Examples are included to study the relative performance of the various estimators.…

由截断样本估计Ⅲ型总体的参数AI 解读

The problem considered is the estimation of the mean and variance of Type III populations from singly and doubly truncated samples with known truncation points when the number of unmeasured observations is (i) unknown for each tail, (ii) known separately for each tail, (iii) known jointly for the two tails. For singly truncated samples, estimation of all three parameters has also been considered. Estimating equations are obtained by the method of moments as well as by the…