stratified random sampling

The simple random sampling plan and stratified random sampling plan has been introduced and the application means and effects of which also has been presented,it has some characteristics such as material precision and obvious reduce of sample size,and rational advice has been presented.

介绍了简单随机抽样和分层随机抽样方法及其在检测中的应用方法和效果。

Though stratified random sampling method is adopted for the arterial and collector functional systems,there is a good potential to improve it.

尽管分层随机抽样的方法已经在干线和一般的集散系统得到利用,它仍有很大的发展空间。

Therefore, the minimum variance and deviation methodology was introduced, based on which, stratified random sampling technology was used for sample design, and thus making an overall assessment more truly on water quality in distributi.

为此提出以最小方差和偏差的方法论,采用分层随机抽样技术进行样本设计,从而对管网水质进行较为真实的全面评价,同时对影响管网水质的因素进行分析。

Methods Based on the number of cases with hepatitis B reported by epidemic status network in 2005, the stratified random sampling surveys with different proportion were taken at the beginning of each month according to last month s regional incidence.

方法根据2005年疫情网络报告乙肝病例数,每月初按上月地区发病不等比例分层随机抽样调查,调查病例统一填写《天津市乙型病毒性肝炎流行病学调查表》,用Excel软件输机并运用SPSS11。

Proportion allocation in stratified random sampling

按比例分层随机抽样

timates in stratified random sampling

分层随机抽样的比率估计值

Multiple Impution for Missing Data in Stratified Random Sampling

分层随机抽样条件下缺失数据的多重插补方法

Methods The investigated sites were selected by cluster sampling from13 cities.

方法在13个市采用整群分层随机抽样的方法选择调查点。

the population is divided into strata and a random sample is taken from each stratum.

总体分成阶层后由各阶层抽选出来的随机样本。

Methods The number of samples was calculated with the optimum allocation stratified random sampling survey.

应用最优分配随机分层抽样方法确定调查点。

Methods Stratified chester random sampling.

方法采用分层整群随机抽样的调查方法。

random sampling

随机抽样,随机采样

Stratified Cluster Sampling and Its Application on the Improved RRT Model for Sensitive Question Survey;

敏感问题改进的随机应答技术模型分层整群抽样研究及应用

Estimation of parameters in stratified cluster sampling on randomized response technique for sensitive question survey

敏感问题随机应答技术模型分层整群抽样下参数的估计

single random sampling

单次随机抽样 单次随机抽样

simple random sampling

简单随机抽样 简单随机抽样

covariance for simple random sampling

简单随机抽样协方差

precision of simple random sampling

简单随机抽样精密度

Hierarchical Information Extraction from Research Papers Based on Conditional Random Fields

基于条件随机场的科研论文信息分层抽取研究

Comparision of Statistics Methods for Analysis of Multistage Clustered Randomized Data;

多阶段随机抽样数据统计分析方法比较

The Sample Average Approximation Method for the Stochastic Variational Inequality Problem

一类随机变分不等式的抽样平均近似方法

APPROXIMATION TO THE DISTRIBUTION OF M-ESTIMATES IN RANKED-SET SAMPLING BY RANDOMLY WEIGHTED BOOTSTRAP

序集抽样中M估计分布的随机加权逼近