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. hausman fe re //hausman检验,P<0.05则选择固定效应
---- Coefficients ----
| (b) (B) (b-B) sqrt(diag(V_b-V_B))
| fe re Difference Std. err.
-------------+----------------------------------------------------------------
dig | .2164167 .2215389 -.0051222 .
cov | -.0440904 -.0459709 .0018805 .
ur | -.1064172 .1360066 -.2424238 .0220457
edu | 7.58e-06 -.0002896 .0002972 .0000148
------------------------------------------------------------------------------
b = Consistent under H0 and Ha; obtained from xtreg.
B = Inconsistent under Ha, efficient under H0; obtained from xtreg.
Test of H0: Difference in coefficients not systematic
chi2(4) = (b-B)'[(V_b-V_B)^(-1)](b-B)
= 120.66
Prob > chi2 = 0.0000
(V_b-V_B is not positive definite)
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