查询词典 sample survey

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 main features of rut distress and rut distribution data in two-layer pavement structure are identified through site survey and laboratory core sample analysis for rut occurred road sections of expressways,which have been opened to traffic for two and six years respectively.

对已通车2年的某高速公路和已通车6年的某高速公路发生车辙路段进行调查测试与室内芯样测量分析，得出了车辙病害的主要特征，以及在两层式路面结构中的分布情况。

The Fe57-xCo18Nb4Al2Si4B15Smx(x=0-3) amorphous alloy ribbons were prepared byvacuum arc melting and melt spinning. The influences of Sm addition on the glass forming ability, thermal stability, crystallization behavior and magnetic properties of Fe57-xCo18Nb4Al2Si4B15Smx amorphous alloys were studied by X-ray diffraction, differential thermal analyzer and vibration sample magnetometer survey.

摘 要：采用真空电弧熔炼和真空熔融甩带法制备Fe57-xCo18Nb4Al2Si4B15Smx(x=0~3)非晶合金，借助X射线衍射、差热分析以及振动样品磁强计等手段研究稀土元素Sm对制备合金的非晶形成能力、非晶热稳定性、非晶晶化行为以及磁性能的影响。

Based on the water resources survey of Shanghai in 1999 and the 1:50 000 color infrared aerial photos obtained in early 2000, a case study of the upper Huangpu River was carried out. The exponential method, pair-sample t test, and remote sensing analysis are used to analyze water environmental characteristics and land use pattern in the river network plain. In order to explore response of water quality in the waterhead region to the changes in land use and its driving force, five land use patterns are selected and a new type of exponential is designed.

以黄浦江上游水源地为例，利用1999年上海水资源普查数据及2000年初成像的上海市1：50000彩红外航空像片，采用GIS空间分析技术、灰色关联分析技术，划分土地利用样带，设计水质改善指数，探讨平原河网地区水环境质量对土地利用结构的响应，以及水源水质对土地利用变化驱动力的响应。

This thesis is about the brand image of the mobile communication of the Chinese Mainland, using the internet to collect data by questionnaire survey. Do the factor analysis on the fifty six sample data, utilizing the software--SPSS. Find out the recessive variables, which are essential but can not be fathomable directly, hiding behind the fathomable variables.

本文就我国内地移动通信行业品牌形象这一主题设卷，通过网络问卷调查形式进行数据收集，利用SPSS统计软件，对五十六个样本数据进行因子分析，找出用来描述隐藏在一组可测量到的变量中的一些更基本的但又无法直接测量到的隐性变量。

Methods Field survey and To sample for testing.

现场调查和采样检测。

The research, by the economist Helene Couprie, is based on a sample of more than 12,000 men and women in the British Household Panel Survey.

这项由经济学家海琳·考普里所做的调查主要基于"英国家庭专门调查"的1万2千多名男性和女性。

Because of this, it has become the most popular method for counting forest birds. In this paper, the assumptions, types, and limiting factors of using point count method in bird survey ere introduced, with the focus on the appropriate selection of sample size, sampling points and sampling time, and the durations of efforts.

本文在介绍样点法的假设条件、类型和影响鸟类调查准确性因素的基础上，重点介绍了样点法在调查森林鸟类需要考虑的样本大小、样点布设、调查时间、每点的停留时间和调查周期等。

Some troubles emerge when we use regression estimator in such a case:in a continuous survey research,when the prior sample and the present sample are independent and they have different elements,we can not compute the regression coefficient.

作连续调查研究抽样时经常用到回归估计。如果前后两个样本相互独立，并且它们所包含的元素不同，就无法直接计算出回归系数。

The survey sample size are 5,284, after excluded noninsurance ,age under20 years old and professional military personnel ; our final sample include 3,288,and there are 1,151 chronic disease patients.After controlling for need factors eg.

其中问卷调查之完访人数为5，284人，最后纳入年龄20岁以上己纳保之受访者，以及由於职业军人之身份较为特殊，不将其列为本次研究范围内，因此最后之样本数为3，288人，其中罹患慢性疾病之人数为1151，其罹病率为21.7%。

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。