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【多选题】
建立玉米产量Y对施肥密度F和降雨量R的回归方程,估计结果为【图片】。则以下说法正确的有:
A.
常数项-120意味着玉米产量可能为负。
B.
若变量F的参数真实值为0.20,则参数估计值-0.10表明OLS估计量是有偏的。
C.
变量F的参数估计值的符号不符合预期,并不影响OLS估计量的BLUE性质。
D.
若方程不满足所有古典假设,变量R的参数真实值也可能等于5.33。
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