分层抽样

Stratified sampling

分层抽样

3, 分层抽样(stratified sampling) 先将总体的单位按某种特征分为若干次级总体(层), 然后再从每一层 内进行单纯随机抽样,组成一个样本.分层可以提高总体指标估计值的精确度,它可以将一个内部变异很 大的总体分成一些内部变异较小的层(次总体).每一层内个体变异越小越好,

Stratified sampling

分层抽样法

样本的选择 分层抽样法(stratified sampling)是将母体分成几个互斥的层(strata)或次群体,然后从各层中随机抽取样本的方法称为分层随机抽样法(stratified random sampling).

stratified simple random sampling

分层简单随机抽样

stratified sampling 分层抽样 | stratified simple random sampling 分层简单随机抽样 | stratum 层

stochastic variable

分层抽样

stratified sampling 统计处理 | stochastic variable 分层抽样 | sum of cross products of 随机变量

area stratified sampling

区域分层抽样

area septa 隔区 | area stratified sampling 区域分层抽样 | area study 区域研究

stratified sampling method

分层抽样法

stratified sampling 分层抽样 | stratified sampling method 分层抽样法 | stratigraphic soil type 层状土壤型

relative-variance for stratified sampling

分层抽样的相对方差

relative-absorption term 相对吸收项 | relative-variance for stratified sampling 分层抽样的相对方差 | relatively closed set 相对闭集

covariance for stratified sampling

分层抽样协方差

covariance between inheritance and environment 遗传环境协方差 | covariance for stratified sampling 分层抽样协方差 | covariance function 积差函数,协方差函数=>共分散関数

stratified selection

分层抽样

stratified sampling 分层抽样 | stratified selection 分层抽样 | stratum 层

sum of cross products of

分层抽样

统计处理 stochastic variable | 分层抽样 sum of cross products of | 随机变量 deviation from mean

NHL：abbr. non-hodgkin lymphoma; 淋巴瘤

complete ordered field：完备有序体

完全的空间n点形 complete n-point in space | 完备有序体 complete ordered field | 完全正(直)交系 complete orthogonal system