loveshihongyu2018-02-28 09:35:37
Hello, instructor. I do not understand the meaning of the sentence that "coefficient of determination measures the fraction of the total variation in the dependent variable that is explained by the independent variable". could you please explain again? Thanks.
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金程教育顾老师2018-02-28 10:15:49
学员你好,这个就是对R-square公式的文字解释,它的分母就是dependent variable的总的离散程度,分子就是被independent variable解释的离散程度。
所谓离散程度就是我们熟悉的方差,分母是用原始的Y的数据计算出的方差,分子是在回归方程中代入自变量计算出的Y计算出的方差。
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