covariance

中文： 协方差、共变异数、协变

1. A statistical measure defined as scriptstyle operatorname Cov(X,Y)= operatorname E((X-μ)(Y-ν)) given two real-valued random variables X and Y, with expected values scriptstyle E(X),=,μ and scriptstyle E(Y),=,ν. (countable, uncountable)
2. The conversion of data types from wider to narrower in certain situations. (countable, uncountable)

复数 covariances