Covariance is a measure of how much two variables move together.
协方差衡量的是两个变量一起变动的情况
A positive covariance means that the two move together.
一个正值的协方差表示两个变量同向变动
Covariance is--we'll call it--now we have two random variables, so cov... I'll just talk about it in a sample term.
协方差是...我们有两个随机变量,x和y的协方差是,从样本的角度来说
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