一种简单随机模型下双重抽样的精度

本文提出了一种估计总体均值的双重抽样方案 ,第一相样本其指标值是粗估得到的含有误差数据 ,但调查费用是廉价的 ,第二相样本采用精确量测方法得到其指标真值 ,费用较昂 ,故容量较小 ,得到的结果表明在调查费用固定下 ,本文方法优于单一简单随机抽样方案 。

Coefficient of Partial Correlation and Its Calculation

This thesis offers the general concept of coefficient of partial correlation.Starting with regres-sion analysis,the paper,by using samples,infers the general formula of expressing coefficient of partial correlation by way of simple correlation coefficient.