抽样误差(所抽样本不具备代表性) a situation in which a set of results or figures does not show a true situation, because the group of people or things it was based on was not typical of a wider group
The margin of sampling error for all adults was plus or minus 3 percentage points. 调查结果误差为上下三个百分点。
It has a sampling error of plus or minus 1.9 percentage points. 该调查的抽样误差为正负1.9个百分点。
Analysis of Influence by sampling error to dissolved oxygen monitoring value 溶解氧采样误差对监测值的影响分析
Analysis of Sampling Error for Soil Water Measured by Drying and Weighing Method 烘干称重法测定土壤水分取样误差分析
Nonuniformly Sampling Error Analysis in Parallel Data Acquisition System 并行数据采集系统中非均匀采样引起的误差分析
In audience measurement, replications involve drawing subsamples from a parent sample to assess sampling error. 在受众测量中,重复调查涉及从原样本中再抽出子样本来评估抽样误差。
The Gauss width of focal spot which is too small results in the sampling error while using CCD as the centroid detecting device of Shack-Hartmann Wavefront Sensor ( SHWS) in Adaptive Optics ( AO) system. 自适应光学系统中采用CCD作为哈特曼波前传感器的光斑质心位置探测器时,由于光斑的高斯宽度较小会带来大采样误差。
Sampling error of hydrologic estimator 水文估计量的抽样误差
Monte Carlo simulation of sampling error of homogeneous test 均匀性试验抽样误差的蒙特卡罗模拟
The margin of sampling error is plus or minus three percentage points for all adults and for Tea Party supporters. 对于成年人和茶党的支持者来说,取样的错误范围在正负3。
Stratified sampling can reduce the sampling error associated with simple random samples. 分层抽样可以减少由简单随机抽样造成的抽样误差。
Study on power harmonics measurement algorithm in response to synchronous sampling error 针对同步采样误差的电网谐波检测算法研究
This describes the percentage of the variability in effect estimates that is due to heterogeneity rather than sampling error ( chance). 这个指标描述了由异质性而非抽样误差引起效应变异的百分比。
Asynchronous Sampling Error and Its Correction in the TV Dynamic Measuring System 电视动态测量中的采样不同步误差及其校正
Q: Would different sample size for different questions affect the sampling error? 问:个别题目的样本数目会否影响抽样误差?
Quantitative Model and Fast Estimation Algorithm of Sampling Error for Association Rule Mining 关联规则挖掘的取样误差量化模型和快速估计算法
In this paper, the sampling error on the mean of annual suspended sediment discharge for the Yichang station on the Yangtze River has been estimated by use of the hydrologic stochastic simulation, and the variation ranges of the mean have been analysed by other three methods. 本文应用水文随机模拟方法,对长江宜昌站年悬移质输沙量均值进行了抽样误差估计,并用其它三种方法分析了均值的变化范围。
The relationship between the fitting index and the sampling error of design events estimated with the curve-fitting method is calculated and analysed with the Monte-Carlo method in the paper. 本文利用Monte-Carlo方法计算了不同适线方法下拟合优度与设计值精度的相关系数,并分析了适线方法的不确定性对以上关系的影响。
The Manipulation of Sampling Error in Experiment 试验抽样的误差控制和调整
Overall, stratified random sampling may increase precision of estimation and decrease sampling error. 总之,分层随机抽样可以提高估计精度,减少抽样误差。
Several methods were used to improve the system calibration and measurement accuracy. A novel interpolation algorithm for calibration was proposed, system gamma and distortion correction was used, and sampling error was controlled. 针对三维测量中测量精度不高的问题,运用多种方法进行改进:提出了一种新的插值标定算法,进行了系统的GAMMA校正、畸变校正以及抑制量化误差,提高了标定与测量精度;
The outcomes show that the sampling error of Xp can be reduced by improving the estimation of prior distribution, and this is obvious for samples with small sizes. 结果表明,提高先验分布的估计精度会降低贝叶斯方法估计Xp的抽样误差,当样本容量较小时效果更明显,这对水文频率分析中使用贝叶斯方法具有一定的参考价值。
The chief method to control sampling error is to well design sampling. 控制抽样误差的主要方法是搞好抽样设计;
The effects of attenuation by precipitation and sampling error on measuring accuracy of 713 type dual linear polarization radar 雨区衰减和雷达取样误差对713型双线偏振雷达测量精度的影响
Thirdly, we obtain the comparison conclusion of multi-objective stratified sampling and simple random sampling error. 三.本文得出了多目标分层抽样与简单随机抽样误差比较的结论。
Systematic error includes temperature error, nonlinear error and sensitive error of sensors, sampling error and analog-digital conversion error in data acquisition, computer calculation error, displaying error and data processing error of virtual instrument software. 系统误差包括传感器的温度误差、非线性误差和灵敏度误差,数据采集中的采样误差和A/D转换误差,以及计算机与检测软件中的计算机运算误差、显示误差和数据处理误差。
By introducing and comparing several typical MPPT methods, this thesis discusses mechanism of misjudgment in MPPT, especially the effect to incremental conductance method caused by sampling error, sampling time and step variation. 本文对几种常用的MPPT方法进行了详细的阐述和对比,分析了MPPT方法中误判的产生机理,重点讨论了采样误差、采样时间、变化步长对导纳增量法跟踪性能的影响。
For the calibration of non-uniform sampling error, the method of fractional delay filter design is given. 对于时间相位误差的校准,给出了分数延时滤波器的设计方法。