抽样

The estimation of population mean is obtained using a cluster sampling method with supplementary stratified sample.

针对这一缺陷，提出了一种辅以分层抽样样本的整群抽样方案，得到了总体均值的估计量，以及这一估计量的一些良好性质。

Students will learn Descriptive Statistics, Probability and Random Variables, Probability Distributions, Sampling and Sampling Distributions in Statistics.

同学们将在统计学中学习叙述统计量的意义与计算、机率与随机变数、机率分配、抽样与抽样分配等基础统计方法。

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。

Methods. A total of 1461 (669 females and 792 males; age range, 16 to 69 yr) workers were selected through a representative population survey (7,597,386 Taiwanese workers) in 1999 from the Taiwan Bureau of Labor Insurance by proportional probability sampling.

研究样本系以等机率抽样方式自1999年台湾地区劳保资料库（抽样母群体包括7，597，386位台湾劳工）抽出，总计有1461笔样本（669位女性与792位男性），年龄介於16至69岁。

With introducing the Proportional to Population Size Sampling technique into resample for the problem of specimen reconstruction effectiveness and rationality, a neural network ensemble method based on the PPS technique was proposed, which could improve the accuracy of individual network and the differences among individual networks; and a new dynamic selection approach of individual network in a neural network ensemble was put forward.

针对样本重组的有效性和合理性问题，将PPS抽样技术引入样本重构，提出了基于PPS抽样的集成神经网络算法，以提高个体神经网络的准确性与差异度，并实现动态选择个体神经网络的神经网络集成新方法。

Objective To know the existing conditions, influence factors of country women's puerperal dietary and to study scientific puerperal dietary and health care pattern.

目的了解农村妇女产褥期饮食习惯的现状及影响因素，探讨其科学的饮食方式和保健模式。方法采取分层抽样与整群抽样相结合的方法，对湖北麻城县农村712名妇女产褥期的饮食状况进行回顾性问卷调查。

Third, we conducted in-depth interviews of 8 persons in 9 times, who were sampled by quota sampling method.

最后以配额抽样法在研究场域针对调解人、召集人与公正人士共抽样8人做9次的深度访谈，得以架构出研究概念并整理研究发现。

It used Quota Sampling with target subject group of local residence in Taipei district of TenMou, collected 265 valid surveys, went through numerous allocation, factor analysis, ANOVA analysis, Regression analysis, and Chi-square test analysis of variance population, characteristic and life style,shops' image, motivation in purchase with satisfaction and return purchases.

使用配额抽样法，以台北市天母地区的民众为抽样对象，回收有效问卷228份，经次数分配、因素分析、ANOVA分析、回归分析、卡方检定对人口统计变数、生活型态、商店形象、购买动机与满意度及再购意愿进行统计分析。

Applying mathematical statistics, this paper studied the characters of random sampling and its excessive random effect on other trip characters, put forward stratified sampling method, researched quota sampling and best distribution sampling.

建议对于大型城市采用简单随机抽样方法；而对于中小城市，按年龄分类，采用分层抽样方法，以提高调查精度。

Based on the proportion estimate and the mean estimate in sampling technology,the authors of this paper put forward the method of ratio estimator in sampling technology and makes a detailed analysis of method.

在抽样技术比例估计与均值估计的基础上，提出了抽样技术的比率估计法，并对其作了详细的分析，同时，通过具体问题的讨论，说明了比率估计法所具有的优越性；针对各个样本比值有比较大的差别时所产生的不稳定性，运用聚类分析的方法提出了具体的比率估计法的改进公式，减少了噪声数据的影响，得到了较高的准确度。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。