查询词典 systematic sampling

Methods Proportional probability sampling method was used to randomly sample 1 200 pupils from 30 counties in Henan Province.

方法采用人121比例概率抽样法分阶段抽样。

This course is a self-contained introduction to statistics with economic applications. Elements of probability theory, sampling theory, statistical estimation, regression analysis, and hypothesis testing.

这是一门独立的统计学导读课程，适用于经济学，要点包括概率论，抽样理论，统计估计，回归分析和假设检验。

The content includes: sources, collection and tabulation of data, description of characteristic of data distribution, probability, sampling method, regression and correlation, hypothesis testing, time series and index number.

主要内容包括：统计数据的收集与整理，数据分布特征的描述，抽样的基本理论与方法，相关分析与回归分析，假设检验的基本理论与方法，时间数列分析，统计指数。

The first CATI system was developed in America, in the middle of 70's. They used CATI to help them to design survey, and to perform the probability sampling.

CATI系统发展最早在美国，约从1970年代中期开始，他们将统计中的机率抽样以电脑程式表现，藉以提高调查回收率。

2 Disposable safe machine blood sampling device: fill the cavity of the blood sample device with bacterial endotoxin check water, and cover both sides. Put it into a 37OC±1OC thermostat for two hours, then take it out and put the probational liquid into a sterile and corked glass container free of pyrogen.

2.4.2一次性使用安全机用采血器：细菌内毒素检查用水，注满采血器内腔，两端封闭，置37OC±1OC恒温箱中保温2小时，取出后将供试液汇集至一无菌无热原带具塞玻璃容器内。

Program design and electric parameter sampling are studied in software aspect.

软件方面对程序设计和电量参数的采样技术进行了研究。

Sampling of propellants under typical operating conditions may be necessary to obtain valid capacitance information.

为了获得有效的容量资料，在典型的工作条件下对推进剂取样是很必要的。

Proper sampling frequency not only can fit the demands of quality monitoring but also can decrease the workload and economize the property.

确定合适的采样频率，即能满足监测目的的要求，又可以减少工作量，节省物力财力。

The simulation results show that the proper selection of sampling frequency numbers and time interval can keep the simulation process fast, efficient and precise, which overcome the shortcomings of long time cost and low precision in the traditional method.

仿真结果表明，适当选取采样频率点数与时间间隔，可以在保证模拟功率谱计算精度的同时，具有快速高效的特点，弥补了传统方法在模拟三维风速时耗时长、精度低的缺点。

According to the principle of proportional allocation,a three-stage sampling survey was set up.

应用按比例抽样原理，建立三级抽样框，抽样比为15％的问卷抽样调查。

Objective:To compare the response control and attention of Schizophrenic patients with that of the healthy controls by Integrated Visual and Auditorycontinuous performance test. To quantitate the impairment of cognitive function in patients, and to explore the relationship between cognitive function and the severity of the disorder.

目的：探讨精神分裂症病人在IVA持续操作测试中的反应控制能力、注意力等，并与健康人进行比较，从而量化精神分裂症病人的认知功能损害，并进一步探讨其认知功能与疾病严重程度的关系。

Main effective factors including subcooling degree, mechanical vibration, gas hydrate reformation, environment temperature, noncondensing gas and surfactant are analyzed.

指出过冷度、机械振动、重复生成水合物、环境温度、不凝性气体、添加剂是影响气体水合物生成的主要因素，还对R152a水合物的放冷进行了实验研究。