covariance
中文来自 ECDICT
- n.
- 协方差
构词拆分
co-前缀
Together: the root word is done co-incidently. · Having commonality, similarity with respect to the root.
+
variance词根/词干
词源说明
释义（英文）
名词 Noun
- (statistics) A statistical measure defined as Cov(X,Y)=E((X−μ)(Y−ν)) given two real-valued random variables X and Y, with expected values E(X)=μ and E(Y)=ν.
- (object-oriented programming) The conversion of data types from wider to narrower in certain situations.