题目内容

以下有关回归分析说法正确的是？

A. 回归分析分为线性回归和非线性回归
B. 一元线性回归分析是利用直线拟合离散点，采用最小二乘估计
C. 非线性回归采用曲线（面）拟合
D. 研究自变量与因变量之间的关系

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