在stata中做固定效应回归结果出现数据有共线性,我用原始数据、取对数后的数据、winsor后的数据分别做固定效应模型的回归,结果都是这样,显示各变量有共线性,可我做vif最大的也才4.8,pearson系数也没有超过0.8的,老师说面板数据值相同也会这样出现这样的情况,我发现我winsor 后的变量的确数值有相同的,但我取对数的数值没有相同的,回归结果任然显示有共线性。回归结果如下:请问如何才能解决
xtreg F1 lnSub1 lnRmw1 lnPop1 lnTrans1 lnEdu1 lnland1 , fe
note: lnSub1 omitted because of collinearity
note: lnRmw1 omitted because of collinearity
note: lnPop1 omitted because of collinearity
note: lnTrans1 omitted because of collinearity
note: lnEdu1 omitted because of collinearity
note: lnland1 omitted because of collinearity
Fixed-effects (within) regression Number of obs = 295
Group variable: A Number of groups = 295
R-sq: Obs per group:
within = . min = 1
between = . avg = 1.0
overall = . max = 1
F(0,0) = 0.00
corr(u_i, Xb) = . Prob > F = .
F1 Coef. Std. Err. t P>t [95% Conf. Interval]
lnSub1 0 (omitted)
lnRmw1 0 (omitted)
lnPop1 0 (omitted)
lnTrans1 0 (omitted)
lnEdu1 0 (omitted)
lnland1 0 (omitted)
_cons -.03032 . . . . .
sigma_u .7953651
sigma_e .
rho . (fraction of variance due to u_i)
F test that all u_i=0: F(294, 0) = . Prob > F = .


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