We use the covariance analysis method to appraise teaching efficiency and provide an important basis for scientific management of teaching.
利用协方差分析方法评价教学效率，为教学的科学管理提供了重要依据。
Take the two-factor covariance analysis for example, the projection method is used to decompose the derivate square.
以双因素协方差分析为例，介绍如何用代数中投影的方法进行离差平方和分解。
Method: Dummy variable is used for analysis of covariance and analysis of variance.
方法：在协方差分析与方差分析中使用哑变量。
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