The standard deviation of a sampling distribution . it is the statistic used to make statements about the accuracy of estimates based on sample information 抽样分布的标准偏差.统计学上用来说明从样本预测的数据的准确性
Wrapper is an important part of virtual database system . this paper proposes and researches a wrapper generation method based on sample example 在参考相关包装器生成技术的基础上,论文探讨和研究了一种基于样本实例的包装器生成方法。
System , which came into operation in 1987 , is designed to present recent , short - term information about beach water quality , based on sampling over the past few weeks 另一套制度是1987年开始推行的等级制,目的是根据过去数星期收集的海水样本,提供最近数周的泳滩水质数据。
Slt is a machine learning theory based on samples , which was started by v . vapnik in the 1970s and matured to form a complete theoretical architecture in the middle of 1990s V . vapnik等人从六、七十年代开始致力于此方面的研究,到九十年的中期,其理论的不断发展和成熟,已基本形成一套比较完整的理论体系。
At present , there are a lot of methods to measure powder concentration . they can be generally classified in two classes , one is based on sampling , and the other is not need to sample 目前国内外测量粉尘浓度的方法各式各样,但是大致可以分为两大类:即基于取样的方法进行测量和基于非取样的方法进行测量。