查询词典 stratified sampling

METHODS: 5 184 people of non-manual workers and manual workers in city as well as farmers at different sex, aged from 20-59 years, were selected in Shijiazhuang, Cangzhou and Chengde with random sampling of stratified cluster in July 2000. They were assigned into 20-39 year group and 40-59 years group according to age to perform investigation of their physical work, which composed of strength of grasp, anteflexion of body when sitting, standing with single foot when closing eyes, back pressure, vertical jump, 10 m×4 return run, push-up, sit-up and choice of reaction time, etc. RESULTS: 4 800 people were involved in the result analysis.

于2000-07用分层整群的随机抽样方法抽取石家庄、沧州、承德3个城市不同性别的城市非体力劳动者、城市体力劳动者、农民3类职业人群的20～59岁公民5184名，按年龄分为20～39岁组和40～59岁组两组，对其进行体能测查，测查内容包括握力、坐位体前屈、闭眼单脚站立、背力、纵跳、10m×4往返跑、俯卧撑、仰卧起坐、选择反应时等。

Methods Stratified random and cluster sampling methods were employed in this study.

正确使用安全、可靠的避孕方法是降低意外妊娠的关键。

Methods With stratified cluster sampling method,2 519 students were questionnaired in Anhui province.

采用分层整群抽样方法，对安徽省2519名中小学生进行问卷调查。

Methods Stratified cluster sampling was used to investigate villagers with questionnaire.

采用分层整群随机抽样方法，对家中有流动人口的村民进行调查。

Methods : A questionnaire survey was conducted among 411 medical staff in 15 departments by stratified cluster sampling.

采用分层随机整群抽样方法，对我院15个部门中的411在职医务人员进行问卷调查。

To interview1483 residents of 15 years and above by the way of stratified and cluster sampling.

通过分层整群抽样访谈调查了黑水县15岁以上居民1483人。

Methods The stratified cluster sampling was used to research 395 college students of Huangshan college by questionnaires.

采用分层整群抽样方法对安徽黄山学院395名大学生进行网络行为问卷调查。

Methods: The survey were designed by stratified cluster sampling.

方法采取分层整群抽样的方法。

It is verified that th action's mean value of the expected value by simple radom sampling is equal to one by stratified radom sampling.

证明了在期望值决策准则下，用等概率分层随机抽样得到的方案收益期望值的均值，与用简单随机抽样得到的相同。

This paper discusses cluster sampling and stratified cluster sampling in continuous surveys with censuses.

本文讨论了连续调查中应用普查方法时的整群抽样和分层整群抽样。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。