题目内容

判定系数的意义是()。

A. 在因变量取值的总离差中可以由自变量取值所解释的比例
B. 它反映了自变量对因变量取值的决定程度
C. 当取值等于1时,拟合是完全的,所有观测值都落在回归直线上
D. 当取值等于0时,自变量的取值与因变量无关
E. 取值越接近1,表明回归直线的拟合越好;相反,取值越接近0;回归直线的拟合越差

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