对系统进行了协方差分析。
Another concept that's very basic here is covariance.
另一个基本的概念是协方差。
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 negative covariance means that they tend to move opposite each other.
负值的协方差就表示，二者反向变动。
If you get a lot of negative products, that makes the covariance negative.
很多个负值的结果相加，就会使协方差是一个负值。
Objective To study the effect of covariate imbalance on analysis of covariance.
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.
目的探讨协变量的不均衡对协方差分析的影响。
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