大雅子 发表于 2019-4-5 10:30 
请问,我也遇到同样的问题,你的问题解决了吗?
我是存在异方差和自相关,做出来的结果是这样的,解释变量不显著,为什么会出现这种情况呢
xtreg roa car cir ldr npl lnnii lnas gdpr,fe robust
Fixed-effects (within) regression Number of obs = 112
Group variable: bk Number of groups = 14
R-sq: within = 0.6734 Obs per group: min = 8
between = 0.0370 avg = 8.0
overall = 0.3132 max = 8
F(7,13) = 8.61
corr(u_i, Xb) = -0.5029 Prob > F = 0.0005
(Std. Err. adjusted for 14 clusters in bk)
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| Robust
roa | Coef. Std. Err. t P>|t| [95% Conf. Interval]
-------------+----------------------------------------------------------------
car | .0034183 .0088528 0.39 0.706 -.015707 .0225435
cir | -.020695 .0073237 -2.83 0.014 -.0365168 -.0048732
ldr | .010208 .0040666 2.51 0.026 .0014226 .0189934
npl | -.3573603 .0747427 -4.78 0.000 -.5188321 -.1958885
lnnii | -.0700864 .0441234 -1.59 0.136 -.1654092 .0252364
lnas | .1301956 .0995473 1.31 0.214 -.0848633 .3452545
gdpr | .0323347 .0282149 1.15 0.272 -.0286199 .0932894
_cons | -.857519 1.920999 -0.45 0.663 -5.007585 3.292547
-------------+----------------------------------------------------------------
sigma_u | .22837812
sigma_e | .14695483
rho | .70718575 (fraction of variance due to u_i)
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