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1. 描述
http://www.theanalysisfactor.com/confusing-statistical-terms-5-covariate/
2. 使用
http://stats.stackexchange.com/questions/11923/covariates-in-regression-models
http://support.minitab.com/en-us/minitab/17/topic-library/modeling-statistics/anova/anova-models/adding-a-covariate-to-glm/
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