For the data with quantitative attribute , several unsupervised discretization methods of continuous features are discussed . three simple boolean discretization methods ( equal width , equal frequency and cluster ) and fuzzy discretization are simulated based on a real population statistical database 随后针对数据库中的模拟量属性，分析了非监督定量属性离散化的几种方法，在一个统计数据库基础上仿真研究了分别基于等宽、等频和聚类的布尔型分段离散化方法和模糊离散化方法。
In its current form , the internet is primarily a source of communication , information and entertainment but increasingly also a vehicle for commercial transactions . an understanding of reasons for purchasing on the world wide web is particularly relevant in the context of predictions made regarding electronic shopping in the future . in the paper , we focus on some of the antecedents to electronic exchange in the online context 本研究采用理论和实证研究相结合的方法，不仅从理论上对概念模型进行了合理的解释，而且引用了在国际上得到广泛认可的gvu统计数据库，采用其在1998年10月所作的第十次网络用户调研数据( gvu ' swww10tnusersurvey )进行数据统计和分析，验证概念模型可靠性，还根据我国国内消费者参与网络购物的实际情况，运用专家评分法，对数据分析的结果进行了检验。
This paper attempts to introduce a spatio - temporal data model for socio - economic statistics and implement it in esri geodatabase . according to the principle of information system analysis and design and the modeling method of spatio - temporal data , this paper introduces gis and spatio - temporal data model to statistical data management 研究的技术线路为:统计数据需求分析、收集整理;统计数据的时间、空间等特征分析;时空数据模型的探讨与设计;物理数据模型的设计;统计数据库的开发与应用。
