不放回抽样

一种基于不放回抽样的图像混沌加密算法

Image Chaotic Encryption Algorithm Based on Sampling Without Replacement

在不放回抽样条件下总体均值的估计

Estimation of Overall Average Without Replacement of Samples

对有限总体在不放回抽样的方法下，构造了一类非线性回归估计量，讨论了它的性质及其有关抽样误差。

A kind of nonlinear regression estimator for limited Population is given and the quality and the sampling variance about is discussed .

本文证明了在不放回抽样条件下，样本平均数不仅是总体均值的无偏估计，而且还是相合估计。

In this paper , the author proves that sample average is both the non-deviation estimation and consistent estimation of overall mean value .

对简单随机不放回抽样，在总体非敏感属性个体比例未知的情况下，给出了两个子样本容量的最优配置。

Under simple random sampling scheme without replacement and unknown proportion of population possessing neutral attribute , the optimal allocation of sizes of two sub-samples is given .

严格πps抽样方案在不放回不等概率抽样方案中的可容许性

Admissibility of Strict π ps Sampling Scheme in Class of Unequal Probability Sampling Scheme Without Replacement