Large-scale sample surveys are always undertaken with stratified multi-stage sampling.
大型抽样调查总是采用分层多阶段抽样。
Method:254 people aged 51~75 with two stage sampling were investigated by using multifactor analyses.
方法：采用二阶段抽样法对254名51～75岁居民用多因素分析法进行了调查分析。
This paper studies the second stage sampling methods used in the two stage sampling survey for waterway transportation volume.
研究了采用二阶抽样对水路运输量进行抽样调查时的第二阶抽样方法。
The distribution and quantity of Felis lynx population in the northeast have been found out by the three-stage sampling method.
我们利用三阶抽样法，查清了东北地区猞猁种群的分布及数量情况。
Methods 3-stage sampling was adopted to collect 15-69 year old constant inhabitants at sites of surveillance for questionnaire investigation.
方法采用3阶段抽样方法，抽取监测点15 ~ 69岁常住居民进行问卷调查。
A balanced three-layer sample rotation pattern is presented in this paper to solve the problem of rotation for the quarterly surveys with three-stage sampling designs.
本文构造了一种平衡的三层次样本轮换模式，解决了三阶段抽样季度调查的三层次样本轮换问题。
We give the approximation formulas of the variance of the sample ratio estimator for a population mean and its asymptotically non-biased estimator in multi-stage sampling.
讨论多阶段抽样比率估计及其样本量选择的问题，给出了比率估计抽样均方误差的近似公式及其渐近无偏估计的公式。
For the ratio estimate in two-stage sampling, the bias and mean square errors(MES) of the estimater value have been obtained, and the estimater value of the MSE has been given.
给出了二阶比估计量的偏差、估计量的均方误差以及均方误差的估计。
However, for the sample size of the sampling stage, but given the proposal in principle, no discussion of the calculation method.
但是，对于各抽样阶段的样本量，只是给出了原则性的建议，没有讨论测算的方法。
The control approaches of microbe during beer production including the earlier fermentation stage, fermentation stage, late fermentation stage and sampling process were summed up.
总结了啤酒生产过程发酵前段、酵母发酵阶段、发酵后段和取样过程中微生物的控制方法和途径。
Methods. The survey was conducted according to multi-stage stratified cluster sampling method.
方法：分阶段分层整群随机抽样调查。
Methods Subjects were collected from community population by stratified multi-stage cluster sampling method. The data gathered from case investigation and serological detection.
方法对社区人群采用多阶段分层整群随机抽样方法抽取研究对象，进行个案调查和血清学检测。
The sampling valve has broad application at each stage of brewing and post-processing of wine and can be used for storage tanks of other wines or beverages.
该取样阀在葡萄酒酿造和后处理的各个阶段都有着广泛应用，也可用于其他酒类或饮料等储罐。
The paper presents a typical self-weighting sample design for the stratified three-stage or over sampling.
本文提出了分层三阶段及以上抽样的自加权抽样设计方法。
Methods A total of 7482 residents aged 15-69 selected in representative 30 counties through multi-stage random sampling from Zhejiang Province were surveyed by using questionnaire.
方法采用多阶段随机抽样的方法，在浙江省有代表性的30个县区，对7482名年龄在15～69岁的居民进行面对面问卷调查。
The present balanced two-layer sample rotation system is applicable only to the monthly survey with two-stage sample designs and with small primary sampling units.
目前的平衡两层次样本轮换模式只适用于一级单元规模较小时的两阶段抽样月度调查。
The figure recognition was an active cognition process, while sampling was the first actual stage in the cognition process.
人对图形的识别是一个主动的认知加工过程，取样是这个认知过程中第一个实质性的加工环节。
RESEARCH METHODThe stratified multi-stage cluster random sampling method was used in the survey.
研究方法本研究采用分层整群随机抽样方法进行抽样。
Calibration estimation which USES known auxiliary information at the estimation stage to improve the precision of the estimators of totals and means has been widely used in survey sampling.
校正估计法已被大量运用于抽样调查中，它利用辅助信息构造的校正权重提高了对总体总值(或均值)的估计精度。
The present experiment carried out at the later stage of cotton growth with the aim to lengthening the period of sampling and culturing as well as the raising of culture efficiency in a larger extent.
本试验选择在棉花生长后期进行，以期延长取材和培养工作时间以及在更大范围内提高培养效果。
Methods the study sample was got by multi-stage randomized sampling, and the injury information of the inhabitants aged over 18 years in Guangdong province was collected by questionnaire.
方法按分层整群抽样的方法抽取样本，并通过问卷调查的方式收集有关广东省18岁以上居民的伤害信息。
Methods: the breakfast structure and the nutrition knowledge of 3 547 students in rural boarding middle school in Chongqing were investigated by adopting stratified two-stage cluster sampling method.
方法：采用分层二阶段整群抽样方法，对重庆市3 547名中学生早餐饮食结构和营养知识进行调查。
Method A multi-stage stratified cluster sampling survey on health condition of 14486 residents was taken in 2007.
方法：采用多阶段分层整群抽样方法，对2007年居民家庭健康状况入户调查，共调查14 486人。
Methods 1356 employees of 7 enterprises from 7 districts of Shenzhen City were selected by multi-stage random sampling and investigated by questionnaires.
方法采用多层随机抽样方法，抽取深圳市7个区7家企业1356名员工进行健康素养现状调查。
Methods 1356 employees of 7 enterprises from 7 districts of Shenzhen City were selected by multi-stage random sampling and investigated by questionnaires.
方法采用多层随机抽样方法，抽取深圳市7个区7家企业1356名员工进行健康素养现状调查。
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