optional sampling meaning in English
可选采样
任意抽样
Examples
- The dma 5000 measures a sample in 40 seconds , considerably increasing efficiency in your lab . optional sample changers automate filling and cleaning , freeing lab personnel from these routine tasks
Dma 5000在40秒内测量一种样品，在相当程度上提高实验室的工作效率。可选配样品转换器，完成自动进样和清洗，解放实验室工作人员执行的这些常规任务。 - Firstly , by numerical and theoretical analysis , the author compares some existent confidence intervals , for example , " exact " confidence interval , wald confidence interval and bayesian confidence interval , and finds some deficiencies points of the confidence intervals , whose modification version has been proposed . also , several better confidence intervals such as are also presented . secondly , for given confidence coefficient and interval width , the author constructs a class of asymptotical two - stage interval estimate procedures . at the same time , under varies restriction of confidence coefflcientent interval width , the optional sample size of the first stage has been computed by numerical computation . the numerical computation shows that the method considered in this dissertation have good properties and applied value
同时，由于poisson分布的特性，我们知道不存在其参数区间长度小于0 . 5的置信区间，基于这些情况，我们主要展开了以下两个方面的研究：一是利用数值计算分析与理论分析的方法对现有的若干置信区间如“精确”置信区间， wald置信区间， bayes置信区间等进行分析比较，发现了一些缺陷，针对这些缺陷，我们进行适当的修正，并得到几种性质较好的置信区间如：修正大样本区间jeffreys原则下置信区间二是针对已给定的置信系数与区间长度，我们提出了一种渐近的两阶段区间估计程序，并利用数值计算的方法，在各种置信系数与区间长度限定下，算出了最优的第一阶段观测次数(抽样量) ，大量数据表明，本文考虑的方法性态良好，具有应用价值。 - With those purposes , the paper discusses the social and economic basis of auditory of circulations with systemically reviewing the origin , development and internationalization of abc and bpa . an analysis on the definition , significance and characteristics of auditory of circulations is also done with a full perspective on the current index systems and series of regulatory regime both on abc and bpa ( us abc and bpa international as the two optional samples ) . furthermore , the author tries to find out a tentative solution on the issue of the system construction of auditory of periodicals " circulations with the analyses of the current social and economic situations , especially the development of the periodical industry and advertising industry in china at the beginning of 21st century
本文对abc和bpa的起源、发展和国际化历程做了系统考察，在此基础上分析发行量认证体系存在和成长的社会经济基础；以美国发行量认证署（美国abc ）和bpa国际媒体认证公司（ bpainternational ）这两个认证机构为样本，对两种认证体系的现行指标体系及具体管理制度等微观层面作全面透视，分析发行量认证的内涵、意义和特征；针对中国当前的社会经济现状，尤其是中国期刊产业和广告业的发展格局进行剖析，解答中国要不要引入期刊发行量认证体系以及中国引入期刊发行量认证体系的初步解决方案这两个问题。