...网 要: 在非平衡数据情况下,由于传统特征选择方法,如信息增益(Information Gain,IG)和相关系数(Correlation Coefficient,CC),或者不考虑负特征对分类的作用,或者不能显式地均衡正负特征比例,导致特征选择的结果下降.
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近年来GIS 与关系数 据库管理系统(Relational DataBase Management System,RDBMS)相结合的应用也比较广泛 [2,3],但空间数据库系统一般较大,对计算机要求比较高,需要专门的中间件应...
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关系数 据库管理系统(Relational Database Management System,RDBMS)就是管理关 系数据库的计算机软件。
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关系数据库 [计] relational database ; RDBMS ; RDB ; RDB Relation DataBase
相关系数 [数] correlation coefficient ; [数] coefficient of correlation ; correlation ; corrcoef
关系数据库管理系统 RDBMS ; [计] relational database management system ; Oracle RDBMS ; object relational database management system
皮尔逊积矩相关系数 Pearson product-moment correlation coefficient
斯皮尔曼等级相关系数 Spearman's Rank Correlation Coefficient
等级相关系数 rank correlation coefficent ; [统计] Coefficient of rank correlation ; Spearman rank correlation coefficient ; Spearman coefficient of rank correlation
复相关系数 [数] multiple correlation coefficient ; coefficient of multipiecorrelation ; Multiple ; Qcum
积差相关系数 Coefficient of production-moment correlation ; moment correlation ; product moment correlation of coefficient
多重相关系数 [数] Coefficient of multiple correlation ; [数] multiple correlation coefficient ; [数] multiple coefficient of correlation
它也支持关系数据和XML的集成。
表格 1 显示了关系数据的例子。
关系数据库使用表格存储信息。
He came up with the relationship that nu bar, which is called wave number --He found the reciprocal.
他也提出了它们与波数的关系,波数是波长的倒数。
So, we could also plot the number of electrons that are ejected as a relationship to the intensity, so that was yet another experiment they could do.
我们还可以画出出射,电子数和光强的关系,这是他们做的。
And this is what they had expected that there would be no relationship, but instead here they saw that there was a linear relationship not to the intensity and the kinetic energy of the electrons, but to the intensity and the number of electrons.
另外一个实验,他们预期这两者没有关系,但他们看到的不是,光强和电子动能的,线性关系,而是光强,和电子数的线性关系。
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