zài / tǒng jì xué / zhōng / xié fāng chā / yòng lái / héng liáng / liǎng gè / biàn liàng / biàn huà / qū shì / de / yī zhì xìng

在统计学中，协方差用来衡量两个变量变化趋势的一致性。

In statistics, covariance measures how consistently two variables change together.