另一个基本的概念是协方差。
负值的协方差就表示，二者反向变动。
A negative covariance means that they tend to move opposite each other.
很多个负值的结果相加，就会使协方差是一个负值。
If you get a lot of negative products, that makes the covariance negative.
协方差衡量的是两个变量一起变动的情况。
Covariance is a measure of how much two variables move together.
目的探讨协变量的不均衡对协方差分析的影响。
Objective To study the effect of covariate imbalance on analysis of covariance.
对系统进行了协方差分析。
对系统进行了协方差分析。
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