1) stratified random sampling
分层随机抽样
1.
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。
2.
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。
3.
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。
3) delaminated random sampling method
分层随机抽样法
4) Optimum allocation stratified randomized sampling survey
最优分配分层随机抽样
5) stratified random sampling surveys
分层随机抽样调查
1.
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。
6) Stratified three-stage PPS random sampling
分层三阶段PPS随机抽样
补充资料：分层抽样
分子式：
CAS号：
性质：又称分类抽样或类型抽样。将总体划分为若干个同质层，再在各层内随机抽样或机械抽样，分层抽样的特点是将科学分组法与抽样法结合在一起，分组减小了各抽样层变异性的影响，抽样保证了所抽取的样本具有足够的代表性。分层抽样根据在同质层内抽样方式不同，又可分为一般分层抽样和分层比例抽样，一般分层抽样是根据样品变异性大小来确定各层的样本容量，变异性大的层多抽样，变异性小的层少抽样，在事先并不知道样品变异性大小的情况下，通常多采用分层比例抽样。
CAS号：
性质：又称分类抽样或类型抽样。将总体划分为若干个同质层，再在各层内随机抽样或机械抽样，分层抽样的特点是将科学分组法与抽样法结合在一起，分组减小了各抽样层变异性的影响，抽样保证了所抽取的样本具有足够的代表性。分层抽样根据在同质层内抽样方式不同，又可分为一般分层抽样和分层比例抽样，一般分层抽样是根据样品变异性大小来确定各层的样本容量，变异性大的层多抽样，变异性小的层少抽样，在事先并不知道样品变异性大小的情况下，通常多采用分层比例抽样。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条