Populations, random samples. Sample statistics, moments of the sample mean and variance.
母体，随机样本。样本统计， 样本平均数和变异数的动差。
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。
This article discusses the relations between randomness and the statistic law by analyzing three types of random samples.
本文通过对三类随机模型的分析，讨论了随机性与统计规律的关系。
The verifications shall be made by way of taking random samples from the declaration documents in the current month and past months.
核查采用随机抽查以往月份申报单和当月申报单的方式。
One manufacturer tests one sample of every type, style and size of finished products. Random samples are taken from warehouses and retail shelves.
制造商对最终产品的每个类型，样式和尺码测试一个样品。从仓库和零售架上随机抽取的样品。
Methods Adopt specially designed investigation form, random samples according to GB4789.1-94 and GB4789.2-94, determining the total of bacterium and coli form.
方法采用统一设计的调查表格，按照国家标准GB4789.1- 94和GB4789.2 - 94检验方法随机抽样进行菌落总数和大肠杆菌测定。
The trapezoidal fuzzy number sample is one of non-real random samples. This dissertation will discuss the support vector machine base on trapezoidal fuzzy numbers.
梯形模糊数样本是一类非随机样本，本文将讨论基于梯形模糊数样本的支持向量机。
Two methods of generating random samples based on chaotic maps were studied to improve the resolution and Electronic Counter-Counter Measure (ECCM) of radar signals.
为了提高雷达信号的分辨率和抗干扰能力，分析了两种基于混沌映射生成随机抽样的方法。
Methods: the 32 cases of DSA image data are analysed, the BP Neural Network is used to build diagnostic model, we input 100 cases of random samples to verify the model.
方法：应用BP神经网络模型，分析32例肝癌病例DSA影像资料数据，建立计算机临床辅助诊断模型，然后把100个随机抽样测试样本输入模型验证。
The problem of using ordinary statistical methods basically for simple random samples in analyzing data from complex surveys for non simple random samples was discussed.
目前国内进行的调查大都采用复杂抽样方案，但在分析时却常常采用只适用于简单随机样本的一般方法。
Methods a questionnaire survey of health risk behaviors in last year was conducted on 919 random samples among children's normal school students by cross-sectional study.
方法采用现况调查方法，整群抽取某幼儿师范学校的919名学生进行最近1年内危害健康行为及其相关因素的问卷调查。
According to maximum likelihood theory, it fuses random samples coming from different matrix (same mean different variance) in an effective way, and gains a nwe estimator of matrix mean.
该方法依据极大似然原理将来自不同母体(均值相同、方差不同)的随机样本有效融合，得到新的母体均值估计量。
The evaluation studied 166 of Rwanda's 401 primary care facilities over a 2-year period; its findings were based on random samples of 13 households living in local areas served by the clinics.
这项评估在两年的时间里研究了卢旺达401个初级服务机构中的166个机构。它的结论是根据13个随机抽样、居住在卫生所服务覆盖地区的当地家庭做出的。
The field of capture-recapture and removal is an important direction of mathematical statistics, which studies the estimation of the sizes of finite populations from incomplete random samples.
捕获再捕获与捕获移出研究是数理统计的一个重要方向，它研究如何利用随机样本估计有限群体的总体数目。
Methods The multicenter, double-blind, random samples, active-controlled study has been processed in the mild to moderate hypertensive patients, and maleic acid amlodipine as the controll drug.
方法以国产马来酸氨氯地平为对照药，在轻度至中度高血压病人中进行多中心、随机、双盲、平行、活性对照的临床试验。
To increase coverage, this land-line sample was supplemented by respondents reached through random dialing of cellphone numbers. The two samples were then combined.
为了增加覆盖率，除了陆上电话局抽取的样本外，调查者还随意拨打了一些手机号，并把两种样本结合起来统计。
The survey was completed on the basis of combining stratified sampling and random sampling, collecting 1005 valid samples in total.
调查在分层逐级抽样法与随机抽样法相结合的抽样基础完成，共收集有效样本1005个。
The ANN model of the dangerous degree classification also trained by random selected enough samples in the range of known parameters.
采用在已知参数范围内随机选取足够的样本的方法来训练危险度分级的神经网络模型。
By using the 772 samples selected at random from Chinese A-sharing companies in 2005 and 2006, this paper researches empirically the features of board of directors of listed company on the audit fee.
通过运用我国A股上市公司2005年和2006年随机选取的772个样本，就上市公司的董事会特征对审计费用的影响进行了实证研究。
The experienced simulation model is introduced on the basis of random model. It can replace a lot of samples, can economize the capacity of samples and can expand information of samples.
在随机模拟的基础上引入经验模拟方法，可代替大量实际抽样，能够节省样本容量，扩展样本信息。
Time sampling Behavior may be missed if random time samples are not taken across the day.
如果没有在全天采取随机时间取样的话，一些行为可能会被错过。
The random sample selection and different sample positions ensure the samples to be representative and fair.
计算机随机选择采样点，采样点车车不同，保证了样品的代表性、公正。
A TC-RT-PCR method basing on reverse transcription with random primer facilitated the detection for those samples mixed infected by ASGV and ACLSV.
用随机引物反转录，通过TC-RT-PCR检测ACLSV和ASGV复合感染的梨样品也均获得了目标片段。
The random rail roughness samples are yielded using random numerical method and power spectral density function.
采用随机数值模拟方法和功率谱密度函数生成随机轨道粗糙度。
Samples drawing by the sampling techniques of Permanent Random Numbers (PRNs) have good characteristic of sample coordination.
采用永久随机数法抽样技术抽到的样本具有很好地样本兼容的性质。
Samples drawing by the sampling techniques of Permanent Random Numbers (PRNs) have good characteristic of sample coordination.
采用永久随机数法抽样技术抽到的样本具有很好地样本兼容的性质。
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