1) sampling error
抽样误差
1.
This paper was focused on deriving the B nomogram of L-moments method,which was used to estimate the sampling errors in frequency analysis.
在设计洪水的抽样误差估计中,采用保证修正值系数B方法估计均方差简单易用。
2.
The results show that the former sampling error becomes much less than the latter.
根据我国频率计算中广泛采用的P-Ⅲ型分布,应用统计试验方法,分别对仅由历史调查洪水和实测洪水组成的不完全系列,以及加入考虑流量误差情况下的古洪水资料后的系列进行了计算,得到后者比前者抽样误差大为减小的结论。
3.
The operation scheme defined by the model has been applied to five hydropower stations on the upper reaches of the Yellow River according to various possible inflows for the analysis of expected energy output and sampling error.
以该模型所确定的调度方案为依据,对黄河上游5座水电站的各种可能来水进行调度,从而对这些水电站的期望电能及其抽样误差作出分析。
2) sample error
抽样误差
1.
Aiming at the sample error and its poor representativeness, this paper introduces several insertoffset methods of runoff for water resources evaluation combining with the properties of hydrology in Baicheng area by the theory of hydrology.
本文针对水文系列的抽样误差代表性不好的问题,利用水文学原理,结合白城地区的水文特性,谈几种在水资源评价时径流量插补的方法。
2.
This paper mainly discusses principle and application of sample error in hydrological analysis, and analyses an example.
阐述了抽样误差的原理及其在水文分析中的应用,并做实例分析。
3.
The correlation degrees between subjects in multi-subject sampling survey are discussed in three cases, in view of every condition, the relevant sample orgainzation and the calculating methods of target variable, sample size and sample error are put forward in this thesis.
本文将多主题抽样调查中各主题间的相关程度分成三类进行了讨论 ,针对每一种情况 ,提出了相应的抽样组织形式 ,目标量的估计方法 ,抽样单位数和抽样误差的控制方法。
3) non-sampling errors
非抽样误差
1.
In this paper,some hotspot issues on the application and theory of survey sampling are reviewed,including sampling design and inference,the analysis of non-sampling errors and small area estimation.
综述了近三四十年来抽样调查应用与理论的若干前沿热门问题,着重讨论抽样设计与推断方法、非抽样误差分析及小域估计等三个方向,同时指出中国抽样调查的实践与理论研究所面临的主要问题。
4) limit of the error of sampling
抽样误差限
5) nonsampling error
非抽样误差
1.
There are many factors that affect the occurrence and the degree of sampling and nonsampling error.
抽样误差和非抽样误差的产生及误差大小各受到多种因素的影响;控制抽样误差的主要方法是搞好抽样设计;控制非抽样误差的主要方法是在调查操作的每一过程环节都采取有效预防措施。
补充资料:抽样误差
分子式:
CAS号:
性质: 抽样方法本身所引起的误差。当由总体中随机地抽取样本时,哪个样本被抽到是随机的,由所抽到的样本得到的样本指标x与总体指标μ之间偏差,称为实际抽样误差。当总体相当大时,可能被抽取的样本非常多,不可能列出所有的实际抽样误差,而用平均抽样误差来表征各样本实际抽样误差的平均水平。
CAS号:
性质: 抽样方法本身所引起的误差。当由总体中随机地抽取样本时,哪个样本被抽到是随机的,由所抽到的样本得到的样本指标x与总体指标μ之间偏差,称为实际抽样误差。当总体相当大时,可能被抽取的样本非常多,不可能列出所有的实际抽样误差,而用平均抽样误差来表征各样本实际抽样误差的平均水平。
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