双重抽样

为PPS抽样而进行双重抽样的方法

A Method of Double Sampling For PPS Sampling

本文把双重抽样技术用于PPS抽样，给出了该方法下总体总值的无偏估计量，估计量的方差及方差的无偏估计公式。

In this paper the method of double sampling is applied to PPS Sampling . We present a unbiased estimator of population total in the method and discuss the variance of the estimator and unbiased estimator of the variance .

用双重抽样处理存在无回答时的比率估计量

The use of double sampling for a ratio estimator in existing of nonresponse

一种简单随机模型下双重抽样的精度

On precision of a kind of double sampling scheme

关于双重抽样

On t he double sampling

按品质的双重抽样方案

Double sampling plan by attributes

市场调研中的混合双重分层抽样方法方法采用分层整群随机抽样的调查方法。

The Method of Mixed two-phase Stratified Sampling in Market Research ; Methods Stratified chester random sampling .

在设置样地对采伐总量调查时，其标志值应为单位面积的实际采伐量，可用总体平均数的双重分层抽样法估计，其分层因子为地貌和林木地。

The marking value should be actual rate by the unit area , it can estimate by method with dual layering and sampling of the general average number , and layering factor as landform and forest site during the survey for total harvesting rate of setting sample plot .